3. Find the period 2 elements (atomic numbers #3-10) and the period 3 elements (#11 - 18). Do period 2 and period 3 have the same trend?
4. Examine your graph. Find the group 1 elements (atomic numbers #1, 3, 11, and 19). What happens to atomic radius as you move down the group?
5. Do you see this same trend in group 18 elements (# 2, 10, 18)?
need help with these 3 questions please !!
Answers
The period 2 elements which have atomic numbers 3-10 are Lithium (Li) and fluorine (F). The period 3 elements which have atomic number 1 - 18 are Sodium (Na) and Argon (Ar). The Period 3 elements have the highest electron affinities than period 2 elements.
What is an element ?The term element is defined as a substance that cannot be broken down into a simpler substance. They are differentiate by a unique atomic number.
The term atomic radius is defined as the distance from the atom's nucleus to the outermost shell of the electron cloud. The atomic radius decreases along with a period and increases down a group.
1 element which have atomic numbers 1, 3, 11, and 19 are alkali metals. Members of group 18 have eight valence electrons in their orbit.
Thus, The period 2 elements which have atomic numbers 3-10 are Lithium (Li) and fluorine (F).
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Related Questions
Which of the following best describes why many interest groups form political action committees?
Answers
Political action committees that promote candidates for public office are created by numerous interest groups.
A community within a larger organisation that shares the objective of developing a certain area of learning, expertise, or technology is known as a special interest group. Members may communicate, physically meet, and organise conferences as they collaborate to influence or create solutions in their specialised fields. Three basic functions are provided by interest groups: member assistance, policy creation, and advocacy. Political parties focus on a broader variety of issues and work to win elections; interest groups, in contrast, have a more focused agenda and don't participate in politics. Political action committees that promote candidates for public office are created by numerous interest groups.
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WHAT IS THE LEWIS STRUCTURE OF FORMAMIDE
Answers
A Lewis structure for formamide is formamide CH3NO items are rated lectrons.
Where does formamide come from?The production of formate esters uses formamide as a feedstock. It is also employed as just an ionizing solvent, an RNA stabiliser in electrophoretic, and for tissue preservation.
Formamide's toxicity levelThe reproductive system may be harmed by formamide. Handle with utmost care because: * Exposure can result in skin irritation and rash; * Contact can irritate or burn the eyes.
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(a) how many grams are there in 1 amu of a material? (b) mole is taken in units of gram-mole. on this basis, how many atoms are there in a pound-mole of a substance? round the answers to 3 significant digits using scientific notation format: x.xxe xx. a) enter your answer for part (a) in accordance to the question statement g/amu b) enter your answer for part (b) in accordance to the question statement atoms/pound-mole
Answers
(a) The number of grams in 1 amu of material is 1.66 * 10^-24 grams. (b) The number of atoms in pound-mole of a substance is calculated as 2.73 *10^26 atoms.
What is Avogadro's constant?Avogadro constant is the proportionality factor that relates the number of constituent particles in sample with the amount of substance in that sample.
(a): We known that : 1gram = 6.022 * 10^23 amu
1 amu = 1 amu / 6.022 * 10^23 *1 gm= 1.66 * 10^-24 grams
Hence, the number of grams in 1 amu is 1.66 * 10^-24 grams
(b) : We know that the value of gram-mole is same in pound-mole.
As, Number of atoms = Pound-mole * Avogadro's number
And 1 Pound-mole = 453.6 gram-mol
As, Avogadro's number = 6.022 * 10^23
So, number of atoms = 1 pound - mol * 6.022 * 10^23 atoms/g mol
Number of atoms = 453.6 gram. mol * 6.022 * 10^23 atoms/g mol
Now, number of atoms = 2.73 *10^26 atoms
Thus, number of atoms in a pound-mole of substance is 2.73 *10^26 atoms.
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About how many calories are in one serving (14-17 grams) of alcohol?
A. 50
B. 100
C. 170
D. 200
Answers
According to the claim, one serving of alcohol (14–17 grams) has around 100 calories.
What do calories mean?Energy is measured in calories. Calories in nutrition relate to the energy that humans obtain from the food and liquids they consume as well as the energy they expend when engaging in physical activity. On every food package, the nutritional information includes a list of calories. Many diet plans for losing weight include cutting calories.
What do food calories mean?Calories are the units of energy used by your body during food digestion and absorption. A meal might provide your body extra energy if it has more calories. Your body stores excess calories from body fat when it eat more than you need.
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if the atomic radius of gold is 0.144 nm, calculate the volume of its unit cell in cubic meters. (Note: Crystal structure of gold: FCC)
Answers
If the atomic radius of gold is 0.144 nm, the volume of its unit cell in cubic meters is the 6.76 × 10⁻²⁹ m³.
Given that :
Atomic radius = 0.144 nm
The crystal of the gold if FCC.
The volume expression is given below :
The edge length is , a = 2√2r
V = 16√2r³
r = 0.144 nm = 0.144 × 10⁻⁹ m
V = 16√ 2 × 0.144 × 10⁻⁹
V = 6.76 × 10⁻²⁹ m³.
Thus, The volume is the unit cell with the atomic radius of the gold ia 0.144 nm is 6.76 × 10⁻²⁹ m³.
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Write the formula of
(a) manganese(III) sulfide.
(b) iron(II) cyanide.
(c) potassium sulfide.
(d) mercury(II) chloride.
Answers
The formulas are as follows-
(a) MnS (b) Fe(CN)2 (c)K2S (d)HgCl2 (Here, the no's are representing in subscript)
Which definition of "formula" is the best?A formula is typically a predetermined pattern used to produce repeatable outcomes. It may consist of a combination of words, figures, or concepts that explain the steps to be taken in order to achieve the intended result. Everywhere we go, formulas—the patterns we adhere to in life—are employed.
What is the definition of a formula in science?In science, a formula, such as a mathematical formula or a chemical formula, is a brief way to convey information symbolically. The basic concept of a relationship between specified quantities is referred to as a formula in informal science usage.
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in preparing a certain ointment, a pharmacist used 28.35 grams of zinc oxide instead of the 31.1 grams called for. calculate the percentage of error on the basis of the desired quantity.
Answers
When making a certain ointment, a pharmacist utilized 28.35 grams of zinc oxide rather than the 31.1 grams specified, which equals 8.8%.
What sort of substance is an ointment?OTC ointments like Aquaphor and Eucerin provide soothing defense for dry, chapped, or cracked skin. These can also assist with psoriasis and eczema patches.
What distinguishes an ointment from a cream?Creams are mostly used for cosmetic purposes and are water soluble. They can also be applied to treat rashes, allergies, and other skin issues. Ointments are greasy products used for cosmetic or medicinal purposes.
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Enter an orbital diagram for V5+ Drag the appropriate labels to their respective targets. Labels can be used once, more than once, or not at all. Not all targets will be filled Reset Help P 111 1s 25 38 4s 2p 3p 4p 3d 61 G1 G1 GIG1 G1 GIG1 G1 G1 G1G1G1 G1|| G1 G16161 62 G2 G2 G2 G2 G2 G2 G2
Answers
The electronic configuration of V5+ is [Ar]3d3. This means that it has three electrons in its 3d orbitals and no electrons in its 4s, 4p, and 4d orbitals.
The electronic configuration of an atom describes the arrangement of electrons in the atomic orbitals of that atom. In the case of V5+, the electronic configuration is [Ar]3d3, which can be understood as follows:
[Ar] represents the core electrons of the atom, which are the electrons in the innermost energy levels (1s, 2s, 2p) of the atom. In this case, since V5+ is a transition metal, its core electrons are those of argon, which is the element immediately preceding vanadium in the periodic table. The core electrons of argon are in the 1s2, 2s2, and 2p6 orbitals, so they are not involved in the chemical behavior of V5+.3d3 represents the valence electrons of the atom, which are the electrons in the outermost energy levels of the atom. In this case, V5+ has three valence electrons in its 3d orbitals.It is important to note that V5+ as an ion has lost 5 electrons. This means that it has lost the electrons from its 4s, 4p, and 4d orbitals, leaving only the electrons in its 3d orbitals. So no electrons are in 4s, 4p, and 4d orbitals.
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The surface of the sun has a temperature of about 5800K and consists largely of hydrogen atoms.
Find the rms speed of a hydrogen atom at this temperature.
Answers
The surface of the sun has a temperature of about 5800K and consists largely of hydrogen atoms. The rms speed of a hydrogen atom at this temperature is 11991 m/s
Given that :
Temperature = 5800 K
The rms speed expression is given as :
Vrms = √3KT / m
mass , m = 1.67 × 10⁻²⁷
The rms speed is given as :
Vrms = √ 3 × 1.38 × 10⁻²³ × 5800 / 1.67 × 10⁻²⁷
Vrms = 11991 m/s
Thus, the rms speed at temperature of the 5800 K and it consist the largely of the hydrogen atom is 11991 m/s.
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What volume of 12.0 M HCl is required to make 75.0 mL of 3.50 M HCl?
a) 21.9 mL
b) 0.560 mL
c) 257 mL
d) 75.0 mL
Answers
To make 75.0 mL volume of 3.50 M molarity HCl, 21.9 mL of 12.0 M HCl are needed.
What is molarity?A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most widely used unit for molarity in chemistry. The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity. The total number of moles of solute in a given solution's molarity is expressed as moles of solute per liter of solution.
Here,
M1V1=M2V2
12V=75*3.5
V=75*3.5/12
V=21.875 mL
The volume of 12.0 M molarity HCl is required to make 75.0 mL of 3.50 M HCl is 21.9 mL.
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from the data below element first ionization energy 1 1310 kj/mol 2 1011 kj/mol 3 418 kj/mol 4 2080 kj/mol 5 947 kj/mol which element is likely to be a metal? select all that apply
Answers
Ionizing radiation, The energy needed to separate an electrons from its neutral gaseous ion or atom is what is meant by this term. Element 3 is probably a metal, hence choice C is the correct one.
What is an electron example?
The smallest elemental component of an atom, the electron has a negative charge. In a neutral atom, there are an equal amount of protons and electrons. One electron one and proton are all that the hydrogen atom has. On the contrary hand, the uranium atom possesses 92 protons, which means 92 electrons.
What do you call an electron?
The collection of subatomic particles known as leptons, which are thought to be basic or elementary particles, includes electrons in its description of particle physics.
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Calculate the equilibrium constant for each of the reactions at 25 ∘C.
A) MnO2(s)+4H+(aq)+Cu(s)→Mn2+(aq)+2H2O(l)+Cu2+(aq)
Standard Electrode Potentials at 25 ∘C
Reduction Half-Reaction E∘(V)
Pb2+(aq)+2e− →Pb(s) -0.13
Mg2+(aq)+2e− →Mg(s) -2.37
Br2(l)+2e− →2Br−(aq) 1.09
Cl2(g)+2e− →2Cl−(aq) 1.36
MnO2(s)+4H+(aq)+2e− →Mn2+(aq)+2H2O(l) 1.21
Cu2+(aq)+2e− →Cu(s) 0.16
Answers
the equilibrium constant (Kc) for the reaction at 25 ∘C is e^(-5764.68/(8.314*298.15))
The equilibrium constant (Kc) for a reaction can be calculated using the standard Gibbs free energy of the reaction (ΔG°) at a given temperature. The Gibbs free energy for a reaction can be calculated using the standard electrode potentials (Eo) of the reduction
half-reactions involved in the reaction as: ΔG° = -nFΔE°
For the reaction : MnO2(s) + 4H+(aq) + Cu(s) → Mn2+(aq) + 2H2O(l) + Cu2+(aq)
The standard electrode potentials for the reduction half-reactions are:
MnO2(s) + 4H+(aq) + 2e- → Mn2+(aq) + 2H2O(l) Eo = 1.21 V
Cu2+(aq) + 2e- → Cu(s) Eo = 0.16 V
The change in standard electrode potential for the reaction is the sum of the electrode potentials for the half-reactions is :
ΔE° = Eo(Mn2+/MnO2) + Eo(Cu/Cu2+) = 1.21 V + 0.16 V = 1.37 VThe standard Gibbs free energy for the reaction is
ΔG° = -nFΔE° = -4 * 96485 * 1.37 = -5764.68 J/mol
The equilibrium constant (Kc) for the reaction at 25 ∘C can be calculated using Kc = e^(-ΔG°/RT) where R is the gas constant (8.314 J/mol·K) and T is the temperature in Kelvin (298.15 K).So the equilibrium constant (Kc) for the reaction at 25 ∘C is e^(-5764.68/(8.314*298.15))
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how can you alter function of an enzyme without altering it's ability of the enzyme to catalyze reaction.
Answers
Catalysts are enzymes. Although some RNA molecules also function as enzymes, they are often proteins. Temperature, pH, & concentration are just few examples of variables that might have impact on enzyme activity.
What exactly are enzymes and what varieties are there?
The International Association of Microbiologists (I U B) classifies enzymes into six functional categories depending on the types of reactions they are employed to catalyse. The six different categories of enzymes include isomerases, hydrolases, peroxides, lyases, transferases, and ligases.
How many different kinds of enzymes are there?
According on the type of process they catalyse, enzymes fall into one of seven categories. These groups include ligases, translocases, hydrolases, lyases, isomerases, and oxidoreductases.
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a chemist makes 480 ml of iron (iii) bromide working solution by adding distilled water ot 120 ml of a 2.43 mol/l stock solution of iron (iii) bromide in water. calculate the concentration fothe chemist's workingsolution.
Answers
The concentration of the chemist's working solution, according to the statement, is 0.13 mol/L.
What does chemistry imply by concentration?The quantity of a material, like salt, that is present in a specific volume of material or liquid, like blood, according to science. When there is less water present, the material becomes more concentrated. You can determine how much molecule has been digested in the solvent by looking at the level of the solution's concentration. For instance, the concentration may be stated as 1 teaspoon of salt per 2 cups of water if you add 1 teaspoon to 2 cups of water.
Stock solution concentration, C1 = 2.43 mol/L
Stock solution volume, V1 = 120 mL = 0.120 L
Working solution quantity: V2 = 480 mL = 0.480 L
We have C1V1=C2V2 for the working solution concentration, C2.
Regarding arranging,
C2 = C1V1/V2
= 2.43mol/L*0.120L/0.480L
= 0.13mol/L
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How many formula units of sodium acetate are in 0.87 moles of sodium acetate
Answers
Answer:
0.87 moles of sodium acetate is equal to 5.22 formula units of sodium acetate. This is calculated by multiplying the number of moles (0.87) by the number of formula units (6) per mole
Explanation:
In a blast furnace, Iron (III) oxide reacts with coke (carbon) to produce molten iron and carbon monoxide. Fe2O3 + 3C = 2Fe + 3CO. How many kg of iron would be formed from 125 kg of Fe2O3?
Answers
The total 178571.42 kg of iron would be formed from 125 kg of Fe2O3 in the blast furnace.
The blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. Blast refers to the combustion air being forced or supplied above atmospheric pressure. It is a block that smelts ores, raw metals and metal armor and tools twice as quickly as a furnace but cannot smelt anything else. In a blast furnace, Iron (III) oxide reacts with carbon to produce molten iron and carbon monoxide.
Fe2O3 + 3C ----> 2Fe + 3CO
Fe2O3 is unstable because the above reaction is thermodynamically favored.
1 mole Fe2O3 = 2×56+3×16 = 160g
2 mole Fe = 112g = 0.112kg
From 125 kg of Fe2O3,
= 160 × 125 /0.112
= 178571.42 kg of Iron formed.
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what is the percentage yield if 125.4 g c3h8 are collected from a reaction that should produce 158.4 g c3h8?
Answers
The percentage yield is 79.4%. This means that 79.4% of the expected amount of C3H8 was collected from the reaction.
What is percentage yield?Percentage yield is a measure of the efficiency of a chemical reaction. It is calculated by dividing the actual yield of a product by the theoretical yield, and then multiplying that number by 100. The theoretical yield is the amount of product that would be produced if the reaction went to completion. The actual yield is the amount of product actually obtained in a reaction.
This can be calculated by taking the actual yield of 125.4 g C3H8 and dividing it by the expected yield of 158.4 g C3H8 and multiplying it by 100.
(125.4 g C3H8 ÷ 158.4 g C3H8) × 100 = 79.4%
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to what group in the periodic table would an element with atomic number 119 belong? group 0 (or 18) group ia (or 1) group viia (or 17) group iia (or 2
Answers
It will belong to the first group and be an alkali metal. for the 119th atomic-number element: Value: 1 for Group: 1 M2O is an oxide, and its outermost electronic configuration is 8s1.
What does an atomic number mean?The atomic number refers to the number of protons in the nucleus of an atom. The number of protons determines an element's name (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
What is the atomic mass and number of the substance?The quantity of the protons and neutrons in a specific element's nucleus is known as the atomic mass. The number of protons in an object's nucleus is often indicated by its atomic number.
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A group of students is investigating whether aluminum is a better thermal conductor than steel. The students take an aluminum wire and a steel wire of the same length and diameter. They put equal lengths of wax on one end of each wire and dip the other end into a beaker of hot water. The length of wax left on the wires after 10 minutes is shown. Experimental Observations Aluminum Steel Original length of wax 2.5 cm 2.5 cm Length of wax after 10 minutes 1.2 cm 1.8 cm Which step should the students take next
Answers
The step that the students should take next is : B. Analyze the data.
What is analysis of data?Data Analysis is the process of applying statistical and/or logical techniques to describe and illustrate, condense and recap and then evaluate data.
Here in the given question, students have conducted an experiment to check their hypothesis on thermal conductivity of two metals; Aluminum and steel. The experimental observations have been noted. Next step based on the scientific procedure is to analyze the data.
Analysis of data suggests that; as the length of wax after 10 min is lower in Al than that of steel, hence aluminum is better thermal conductor.
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what are multivalent elements and polyatomic ions?
Answers
Multivalent elements are metals that can form more than one stable ion charge. Polyatomic ions are ions that consist of more than one atom.
What are polyatomic ions?The primary distinction between a multivalent element and a polyatomic ion is that multivalent elements have several valencies, whereas polyatomic ions contain multiple atoms that are covalently bound to each other. The prefix "multi-" means "many".
The normal ion has only one element, chlorine. The polyatomic ion contains two elements: chlorine and oxygen.
Therefore, metals that can create more than one stable ion charge are known as multivalent elements. Polyatomic ions are ions with more than one atom.
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what determines the average kinetic energy of the molecules of any gas? group of answer choices molar mass temperature pressure container volume
Answers
The kinetic energy of a gas's particles is inversely related to its temperature. As the gas warms, the particles must travel more quickly because their mass is constant.
Describe kinetic energy.A particle or an item that is in motion has a sort of energy called kinetic energy. An item accumulates kinetic energy when work, which involves the transferring of energy, is accomplished on it by exerting a net force.
How do you calculate kinetic energy?The relationship between kinetic energy and an object's mass and square of all its velocity is direct: K.E. = half m v2. if the mass is measured in kilograms, and the speed is measured in meters per second.
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A. frequency C. wavelength G What do we call the height of a wave? B. amplitude D. speed
Answers
Answer:
Explanation:
The height of the wave is called the amplitude.
so the correct answer is B.
If the products formed from the burning candle are mostly carbon (c), carbon dioxide (co2), and water (h2o), what elements are the reactants, how do you know?
Answers
The reactants in candle burning would be carbon, hydrogen, and oxygen.
Fuel (the candlewick and wax) and oxygen are the reactants in the burning of a candle (in the air). Carbon dioxide gas and water vapour are the end results. The substances were hydrogen, oxygen, and carbon. Since nothing is formed or destroyed during a chemical reaction, we can conclude that the element present in the products was also present in the reactants. The law of conservation of energy in physics and chemistry asserts that an isolated system's total energy remains constant. It is the underlying principle of the first law of thermodynamics, which is most frequently stated as "energy cannot be generated or destroyed."
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- Mary went to Daytona Beach and found there was a bathroom scale in her hotel room. The first
morning her weight was 127 lbs. Mary concluded that the grapefruit diet does not work and went to the nearest McDonald's for a supersized Big Mac meal. What was wrong with Mary’s conclusion?
Answers
mary went to the bathroom and found the scale to weight out there so she weighed herself at the bathroom and found her weight was 127lbs
what was scale used for ?
What is the purpose of scales. Scales are weight-measurement devices. Balance scales are widely used to compare object weights or to weigh objects by balancing them against standard weights.
Gravity affects the outcomes of scales. Balances, perplexingly, employ a process known as a force restoration mechanism to generate a force that balances the unknown mass.
A scale factor is defined as the ratio of the scale of a given original item to the scale of a new object that is its representation but of a different size (bigger or smaller).
All of this is made feasible by the mathematical idea of scale factor. The scale factor is a quantity used to grow or decrease the size of forms in two-dimensional and three-dimensional geometry. It may be used to make figures that are similar yet have different proportions.
mary went to the bathroom and found the scale to weight out there so she weighed herself at the bathroom and found her weight was 127lbs
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combustion can occur within a range of concentration of fuel vapor and air; this range is referred to as the:
Answers
There is a range of fuel vapor and air concentrations where combustion can occur; this range is known as the below explained.
The range of concentration of fuel vapor and air within which combustion can occur is referred to as the "flammable range" or "explosive range." This range is different for different fuels, but typically it is between the lower explosive limit (LEL) and the upper explosive limit (UEL). The LEL is the minimum concentration of fuel vapor in air at which combustion can occur, while the UEL is the maximum concentration above which combustion cannot occur. It is important to note that Combustion also depends on other factors such as temperature, pressure and the presence of ignition sources.
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how many molecules are in 4.62 moles of nitric acid
Answers
The number of molecules in 4.62 moles nitric acid has been 27.82 × 10²³.
It's likely that the common person has had no notion how many molecules make up 4.62 milligrams of hydrogen peroxide, but that's good! By the end of this article, you will be able to confidently respond to that question since you will having studied everything you needed concerning moles and molecules.
The moles have been described as the mass of the compound with respect to the molar mass. According to the Avogadro law, the number of molecules present in a mole of sample has been equivalent to the Avogadro number.
Therefore,
The Avogadro number has been a constant quantity with the value of .
6.023 × 10²³
The Avogadro law has been given as:
1 mole = 6.023 × 10²³ moles
Calculating for 4.62 moles nitric acid as:
4.60 moles = 6.023 × 10²³ × 4.62 molecules
⇒ 4.60 moles = 27.82 × 10²³ molecules.
The number of molecules in 4.62 moles nitric acid has been 27.82 × 10²³
Consequently, there are 27.828 x 10′′23 nitric acid molecules in 4.62 moles of nitric acid. This article is not simply concerning Avogadro's number. It turns out that these mass of the particles impacts how many particles are present in a mole of a substance So.
Complete Question:
How many molecules are in 4.62 moles of nitric acid (HNO3)?
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In a certain gaseous reaction , 2 mol NO react with 1 mol O 2 :; 2 NO(g)+O 2 (g) longrightarrow2 NO 2 (g) a Given the same conditions of temperature and pressure , what volume of O_{2}(g) would react with 4 L NO gas ? b. How might chemists use their knowledge of molar volumes to monitor the progress of this reaction ?
Answers
The chemical reaction of metallic compound vapors is utilized in the gaseous reaction method.
This H2 O2 --> H2O reaction is what kind of reaction?When two or more reactants come together to create one product, the reaction is called a "synthesis reaction."Here, the 4 hydrogen atoms from the two molecules of hydrogen gas (H2) and the two oxygen atoms from the single molecule of oxygen gas unite (O2 ).The only product produced in this process is water, sometimes known as H2O H 2 O.Combination reactions are those that take place when two or more reactants combine to create a single product.Synthesis reactions, or combination reactions, are another name for them.In the equation below, for instance, hydrogen and oxygen can combine to make water.2H2 + O2 → 2H2OFor the sake of this activity, you can ignore the numbers in the equations.To learn more about reaction refer
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hydrogen chloride gas (hcl) diffuses 1.8 times faster than an unknown gas. determine the molar mass of the unknown gas. show your work or explain your answer, giving specific values used to determine the answer.
Answers
According to the provided statement, the mystery gas has a molar mass of 118.1 g/mol.
What is the purpose of hydrogen chloride?Numerous processes and products are refined and made using hydrogen chloride, including scrubbing, pickling, depositing metals, curing leather, and sanitising. Burning various plastics can result in the formation of hydrogen chloride. In the presence of water, it produces hydrochloric acid.
Graham's Rule of Emfluence
According to Graham's law of effusion, a gas's effusion rate is inversely related to the square root of its particle mass. You may write this formula as follows:
[tex]\frac{\text { Rate }_1}{\text { Rate }_2}=\sqrt{\frac{\mathrm{M}_2}{\mathrm{M}_1}}[/tex]
Rate1 is the first gas's effusion rate.
The second gas's effusion rate is represented by Rate2.
The average concentration of gas is M1, The mole ratio of gas is 1 M2. 2.
Gases like hydrogen chloride (HCI) diffuse 1.8 times more quickly than unidentified gases.
The molar volume of halogens (HCI) is known to be 36.46 g/mol.
Unknown gas has a molar mass of =?
In the formula, let's enter the following values:
[tex]\frac{\text { Rate }_{\mathrm{H}_2}}{\text { Rate }_{\text {unknown }}}=\sqrt{\frac{\mathrm{M}_{\text {unknown }}}{\mathrm{M}_{\mathrm{H}_2}}} 1.8=\sqrt{\frac{\mathrm{M}_{\text {unknown }}}{36.46}}(1.8)^2=\frac{\mathrm{M}_{\text {unknown }}}{36.46} \mathrm{M}_{\text {unknown }}=36.46 \times(1.8)^2 \mathrm{M}_{\text {unknown }}=118.1304 \mathbf{M}_{\text {unknown }}=\mathbf{1 1 8 . 1}[/tex]
The unknown gas has a molar mass of 118.1 g/mol.
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Classify each of the following as a redox reaction or a non-redox reaction.
Zn + CuCl2 --> ZnCl2 + Cu
SO3 + H2O --> H2SO4
HCl + NaOH --> H2O + NaCl
2CO + O2 --> 2CO2
Answers
1.Redox; Cu reduced, Zn oxidised No change in oxidation states; non-redox 3. Non-redox; oxidation states remain unchanged 4.Redox; O reduced, C oxidised.
Describe redox in plain English.A chemical reaction that occurs when an oxidising substance and a reducing substance come into contact. In the reaction, the reducing substance obtains electrons while the oxidising substance loses electrons.
What is the purpose of redox?Any chemical process in which a molecule, atom, or ion suffers a change in its oxidation number as a result of acquiring or losing an electron is known as an oxidation-reduction reaction. Many fundamental processes of life, such as photosynthesis, respiration, combustion, and corrosion or rusting, depend on redox reactions.
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in which of the following aqueous solutions would you expect agcl to have the lowest solubility? Choose one answer. a. 0.020 M KCl b. pure water c. 0.015 M NaCl d. 0.020 M BaCl2 e. 0.020 M AgNO3
Answers
AgCl would have the lowest solubility in 0.020 M BaCl2. The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility.
There is a wide range in the solubilities of different substances, and this characteristic of a specific solute-solvent pair is obvious. The equilibrium constant for a solid material dissolving in an aqueous solution is the solubility product constant. Ksp. It refers to how much a solute dissolves in a solution. The Ksp value of a substance rises as its solubility does. The least soluble substance is BaCl2, which also has the lowest Ksp of 0.020 M.
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