Answer: it is b i got it right on the test
Explanation:
(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
(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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Which of the following best describes why many interest groups form political action committees?
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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Consider the following reaction:
2Ca(s)+O2(g) → 2CaO(s)
ΔH∘rxn= -1269.8 kJ; ΔS∘rxn= -364.6 J/K
Assume that all reactants and products are in their standard states.
A. Calculate the free energy change for the reaction at 35 ∘C.
Express your answer using four significant figures.
B. Is the reaction spontaneous?
The free energy change for the reaction at 35 ∘C is -1157.45 KJ
Gibbs free energy also termed as the Gibbs energy as well as free enthalpy, or Gibbs function is a quantity which is also used to measure the maximum amount of work done in thermodynamic system when the pressure and temperature are kept constant.
Formula of Gibb's free energy is as follows:
ΔG = ΔH -TΔS
ΔH =1269.8 kJ
ΔS= -364.6 J/K
T = 35ºC = 308.15
ΔS = x 0.001 = 0.3646
ΔG = 1269.8 kJ -(308.15x-0.3646)
ΔG = -1157.45 kJ
Therefore, it is a spontaneous process.
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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
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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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.
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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How many formula units of sodium acetate are in 0.87 moles of sodium acetate
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:
what volume, in ml, of 2.00 m hydrobromic acid is required to react completely with 0.10 mol of solid magnesium hydrox
In order for 0.10 mol of crystalline magnesium hydroxide to completely react, 100 mL volume, in milliliter, of 2.00 mol hydrobromic acidity is needed.
What purpose does magnesium hydroxide serve?Magnesium hydroxide is just a short-term medication for adults and children who experience sporadic constipation. Saline laxatives are a group of drugs that include magnesium.
The effects of magnesium hydroxide on the body are what?Magnesium hydroxide increases gastrointestinal water and lowers stomach acid, which may promote bowel movements. A reliever used to address sporadic nausea is potassium hydroxide. Additionally employed as a neutral to relieve stomach pain, vomiting, and discomfort is potassium hydroxide.
2.00 mol H × = 100 mL
= 1.00 L
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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
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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what are multivalent elements and polyatomic ions?
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 IS THE LEWIS STRUCTURE OF FORMAMIDE
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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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?
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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10 moles of hydrogen are allowed to react with 6 moles of oxygen. How much water will be obtained from reaction on complete consumption of one gas
5 moles of water will be obtained from the reaction on complete consumption of one gas.
The balanced equation for the reaction between hydrogen and oxygen to form water is:
2H2 + O2 -> 2H2O
From the given information, we know that 10 moles of hydrogen are allowed to react with 6 moles of oxygen.
In order to determine the amount of water that will be formed, we can use the stoichiometry of the reaction to calculate the number of moles of water that will be produced.
Since the coefficients in the balanced equation are the same for hydrogen and oxygen, we can use the number of moles of either gas to calculate the number of moles of water that will be formed.
In this case, we have 10 moles of hydrogen and 6 moles of oxygen.
From the balanced equation, 2 moles of H2 react with 1 mole of O2 to form 2 moles of H2O. So, 10 moles of H2 / 2 moles H2 per mole H2O = 5 moles of H2O will be formed.
So, 5 moles of water will be obtained from the reaction on complete consumption of one gas.
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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
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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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.
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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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
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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Two forces of 5 N and 7 N respectively act on an object. d)Draw a diagram to show the maximum and minimum resultant
Answer: The maximum resultant force: 12 N
The minimum resultant force: 2 N
Explanation: A force is actually a vector. And if there is no angle among these two forces (or let's say "vectors"), this is the maximum situation (not a general rule, but it is valid for this question because both vectors are positive) and we add these forces up for the solution. So, the magnitude of this resultant force would be 12 N.
Drawing one force vector which has 12 N magnitude and acts on the object would be enough for the solution.
However, the angle among them should be 180 degrees so that the minimum situation exists. So, we are actually subtracting these two forces instead of adding them here.
This means that drawing one force vector which has 2 N magnitude would be enough for the other solution.
A. frequency C. wavelength G What do we call the height of a wave? B. amplitude D. speed
Answer:
Explanation:
The height of the wave is called the amplitude.
so the correct answer is B.
how many molecules are in 4.62 moles of nitric acid
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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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.
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 is the percentage yield if 125.4 g c3h8 are collected from a reaction that should produce 158.4 g c3h8?
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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Which element can combine to form ionic bonds?
a. H and CIa
b. H and N
c. S and Sr
d. Xe and F​
Among the given elements, S and Sr forms ionic compound. Sr metal donate electron to sulfur forming ionic compound.
What are ionic compounds?Ionic compounds are formed between metals and non metals. The metals are electropositive elements. They easily loss electrons in chemical bonding.
Strontium is an alkaline earth metal with two valence electrons. Strontium forms ionic compounds with non-metals by donating its two valence electrons.
Sulfur needs two more electrons to achieve octet. Hence, it easily gain two electrons from strontium metal forming the ionic compound SrS.
Hence, option c is correct.
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1. Shippers package in order to (fill in the blank) the material. 2. Driver placard their vehicle to (fill in the blank) the risk. 3. What three things do you need to know to decide which placards (if any) you need
1- Shipper's package in order to protect the material. 2- Drivers placard their vehicles to indicate the risk. 3- To decide which placards (if any) you need, you need to know: The particular hazardous material being transported, The quantity of the hazardous material being transported.
The classification of the hazardous material being transported (UN number)The United Nations (UN) number identifies a specific hazardous material and is used to classify and identify materials for transportation. The UN number is used to determine the appropriate placarding for a vehicle transporting hazardous materials. It should be noted that the UN number, the quantity and the classification are used to determine the proper labeling, packaging, and documentation required for transportation of hazardous materials.
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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
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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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
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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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 ?
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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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
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.
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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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)
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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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.
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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How much energy is needed to break the necessary bonds in the formation of two moles of water based on the following balanced equation?
2H2 + O2—-> 2H2O
882 kJ/mol of energy will be needed to break the necessary bonds in the formation of two moles of water.
What is energy?Energy is described as the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light.
The bond energy of H-H is 436 kJ/mol
The bond energy of O=O is 495 kJ/mol
The bond energy of H-O is 463 kJ/mol
In order to calculate the total energy needed to break the bonds in the reactants, we add up the bond energy of each bond broken.
For 2 moles of H2 we need 22436 = 1744 kJ/mol
For O2 we need 2*495 = 990 kJ/mol
In total, we need 1744 kJ/mol + 990 kJ/mol = 2734 kJ/mol
we will then add up the bond energy of each bond formed.
For 2 moles of H2O we need 22463 = 1852 kJ/mol
Therefore, the energy needed to break the necessary bonds in the formation of two moles of water is 2734 kJ/mol - 1852 kJ/mol =
882 kJ/mol
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