The cell potential of a galvanic cell is determined by the difference in the reduction potentials of the two half-cells involved. The larger the difference, the higher the cell potential. The half-reaction with the highest reduction potential will give the largest cell potential when paired with the Ni2+/Ni electrode.
When looking at the reduction potentials, Al3+/Al has a standard reduction potential of -1.66 V, whereas Ni2+/Ni has a standard reduction potential of -0.25 V. Therefore, the reaction with the highest reduction potential difference (i.e., the largest cell potential) when paired with the Ni2+/Ni electrode would be the one that has a reduction potential greater than -0.25 V.
Out of the options given, Al3+/Al has the highest reduction potential and thus it would give the largest cell potential when paired with the Ni2+/Ni electrode. This is because the reduction potential difference between Al3+/Al and Ni2+/Ni is 1.41 V, which is the largest among the given options.
In conclusion, the half-reaction that would give the largest cell potential when paired with a Ni2+/Ni electrode is Al3+/Al.
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Which statement is the best description of the energy found in molecules of water?
A molecule's temperature is not connected to its energy.Hotter molecules have more kinetic energy.
Colder molecules have more kinetic energy.
Colder molecules have more thermal energy.
Answer:
In hot water, molecules gain kinetic energy, therefore molecules in hot water have kinetic energy
while molecules of cold water have less or no kinetic energy
How and why is C is the right answer?
The correct answer to the question is option C as that is the only option in which the change in entropy is positive.
Entropy is the degree of randomness in the system. The gaseous state has the highest entropy among the state of matter.
a) Ag⁺ (aq) + Cl⁻ (aq) → AgCl (s)
Since the aqueous state has higher entropy than solids, the change in entropy is negative
b) H₂O (l) ----> H₂O (s)
Since the liquid state has higher entropy than solids, the change in entropy is negative.
c) 2SO₃ (g) ----> 2SO₂ (g) + O₂ (g)
Since the reactant has only 2 moles of gas and the product has 3 moles of gas, the entropy of the reactant increases with the reaction.
d) CaO (s) + CO₂ (g) -----> CaCO₃ (s)
Since the reactant has one mole of gas and the product has none thus the change in entropy is negative.
e) N₂ (g) + 3H₂ (g) ------> 2NH₃ (g)
Since the reactant has more moles of gases than the product which are 4 and 2 moles of gas respectively, the change in entropy is negative.
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Identify the molecule, (molecular formula C2H6O)
According to the peaks depicted and the chemical formula the molecule is that of ethanol.
Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
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is it true or false that Shield volcanoes have gentle, long-term eruptions.\
Answer:
false shield volcanoes are the product of gentle effusive eruptions
Which piece of information do you need to determine whether a molecule is an alkyne or an alkene?
A. The type of C-H bonds in the molecule
B. The number of C-H bonds in the molecule
C. The number of C-C bonds in the molecule
D. The type of C-C bonds in the molecule
Answer is D
The piece of information that you need to determine whether a molecule is an alkyne or an alkene is D. The type of C-C bonds in the molecule
How to determine whether a molecule is an alkyne or alkene?Alkenes and alkynes can be decribed as the name that is been gotten by by identifying the longest chain that contains the double or triple bond.
It should be noted that The chain is numbered so that theminimization of the numbers assigned to the double or triple bond can be easy however the suffix of the compound can be “-ene” when regarding to an alkene or “-yne” when regarding to alkyne.
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What is the oxidation number of Boron? (2.2.1)
2+
2-
3+
3-
Answer:
The answer is C
3+
Explanation:
electron configuration =2,3
oxidation state of boron=3+
a blank can be seen when a substance change into a new substance
As per chemical changes, a color change can be seen when a substance change into a new substance.
Chemical changes are defined as changes which occur when a substance combines with another substance to form a complete new substance.Alternatively, when a substance breaks down or decomposes to give new substance it is also considered to be a chemical change.
There are several characteristics of chemical changes like those of change in color, change in state , change in odor and even change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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Please help answer these!
Which equations represent inverse variation? Check all that apply.
O y = 2x
pu = 13
z = 2
X
4 =
h = 99
1= ⁹0
Answer:
y = 2x pv = 13 z = (2/x) 4 = (y/x) h = (9g/5) Inverse variation is represented by the equation y = k/x, where k is a constant.
What influenced Denis to write the first non-objective statement? (You must use one quote from his article the Definition of Neotraditionism)
What factors led Kandinsky to arrive at non-objective painting? (You must give at least one quote from Concerning the Spiritual in Art, and list the page number.
What did Kandinsky write about color? (You must give at least one quote from Concerning the Spiritual in Art - Part II. About Painting, VI: The Language of Form and Color and give the page number.)
Art Nouveau is perhaps the first historical artistic movement that comes to mind when thinking about the Neo-Traditional style and japan.
Thus, in order to comprehend Art Nouveau, one must first comprehend the context and symbolism that led to the development of the style.
Japan has cut off communication with the rest of the world by 1603. The floating world was determined to defend and preserve its culture, which was under severe attack from outside powers.
To debate the opening of Japan's heavily guarded gates, forty Japanese officials were dispatched to Europe in 1862, more than 250 years later. Goods from the two countries started to transcend oceans and lands to eagerly awaiting fingertips in order to reduce tensions between the countries and maintain stable Japan.
Thus, Art Nouveau is perhaps the first historical artistic movement that comes to mind when thinking about the Neo-Traditional style and japan.
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Hello. Need help answering this question.
A sample of Zn(s) is reacted with HCl(aq) to form hydrogen gas. The H2 gas bubbles out of aqueous solution and is collected in a 670.0 mL container at 576.0 Torr and 25 C. How many grams of zinc reacted?
0.04 grams of zinc reacted
The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as
PV = nRT
where,
P = Pressure
V = Volume
T = Temperature
n = number of moles
Given,
Volume = 670 ml = 0.67L
Pressure = 576 torr
Temperature = 25 degree celsius
PV = nRT
576 × 0.67 = n × 62.36 × 298
n = 0.02 moles
mass = moles × molar mass
= 0.02 × 2 = 0.04g
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A+ 2B
An elementary liquid phase reaction needs to be carried out in a CSTR reactor with a
volume 5 m3 and conversion desired is 70%.the molar feed is 30 % A and 70% B at a
pressure 202 kpa and 333к
1. Construct a complete stoichiometric table in terms of concentrations
2. What is the rate of reaction of A
3. Calculate k & E and then specify the type of reaction energy
Additional information:
Total feed: 10 mole/s.
Gas constant: 8.314 kJ/mol.oK
Frequeney factor: 0.00717 m'/mols
The stoichiometric table and the rate law for the given elementary liquid phase reaction have been constructed. The rate constant and activation energy have been calculated, and the type of reaction energy has been specified as endothermic.
Stoichiometric table in terms of concentrations:
The stoichiometric table for the given reaction can be constructed as follows:
A + 2B → products
A B products
Feed 0.3*Cf 0.7*Cf 0
Exit (0.3-0.3X)*C (0.7-0.7X)*C 0
Change -0.3XC -0.7XC 0
Where:
Cf = Total feed concentration
C = Concentration inside reactor
X = Conversion of A
Rate of reaction of A:
The rate of the reaction can be expressed as:
rA = -1/2 * dCA/dt = k*C^2
where, CA is the concentration of A and k is the rate constant.
Since the reaction is elementary, the rate law is proportional to the concentrations of the reactants raised to their stoichiometric coefficients.
The rate of disappearance of A = rate of appearance of B
rB = -dCB/dt = 2*rA
Therefore, the rate of reaction of A can be expressed as:
rA = (0.7Cf - 0.7C)/V = k*C^2
Substituting values, we get:
rA = (0.710 - 0.70.7X)/5 = k(0.3 - 0.3*X)^2
Calculation of k and E:
The rate constant k can be calculated using the Arrhenius equation:
k = A * exp(-Ea/RT)
where A is the frequency factor, Ea is the activation energy, R is the gas constant and T is the temperature in Kelvin.
Assuming the activation energy is 50 kJ/mol, we can calculate the rate constant at the given temperature of 333 K:
k = 0.00717 * exp(-50000/(8.314*333)) = 0.0001504
The reaction energy can be determined by calculating the activation energy using the rate constant at two different temperatures. Assuming the rate constant at 323 K is 0.000098, we can solve for Ea:
ln(k2/k1) = Ea/R * (1/T1 - 1/T2)
ln(0.000098/0.0001504) = Ea/8.314 * (1/323 - 1/333)
Ea = 43775 J/mol
The positive value of the activation energy indicates that the reaction is endothermic.
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Consider the solubilities of a particular solute at two different temperatures.
Solubility (g/100 g H₂O)
44.3
81.4
Temperature (C)
20.0
30.0
Suppose a saturated solution of this solute was made using 51.0 g H₂O at 20.0 °C. How much more solute can be added if the
temperature is increased to 30.0 °C?
9.64 g more solute can be added if the temperature is increased to 30°C
The maximum amount of solute that can dissolve in a known quantity of solvent at a certain temperature is its solubility.
A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved. An unsaturated solution is a solution that contains less than the maximum amount of solute that is capable of being dissolved.
Mass of solute present in a saturated solution with 51.0 g H₂O at 20.0 °C is
(44.3 × 51) ÷ 100 = 22.6g
The ratio of solubilities at two different temperautures = 81.4 / 44.3 = 1.83
This means that there can be 1.83 times more solute when the temperature is 30 °C.
22.6 × 1.83 = 41.35 g
So, the mass of solute that can be added = 51 - 41.35 = 9.64g
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A patient is given 0.050 mg of technetium-99 m
(where m means metastable—an unstable but long-lived state), a radioactive isotope with a half-life of about 6.0 hours. How long until the radioactive isotope decays to 3.1×10−3 mg?
It will take 22 hours until the radioactive isotope decays to 0.0031mg.
The half-life of a chemical reaction can be defined as the time taken for the concentration of a given reactant to reach 50% of its initial concentration.
The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.
Given,
Initial mass = 0.05 mg
Final mass = 0.0031 mg
Half Life = 6 hours
N / N₀ = [tex]( 1 / 2)^n[/tex]
0.0031 / 0.05 = [tex]( 1/2)^n[/tex]
n = 3.65
t = n × half life
= 3.65 × 6
= 21.9 hours = 22 hours
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2.380 gm of a metal on treatment with nitric acid and subsequent ignition gave 3.022 gm of the metallic oxide. Specific heat of metal is 0.055. Calculate the exact atomic weight.
what kind assorted fruits that can be sold in school
The kind of assorted fruits that can be sold in school are Apples
Bananas, Oranges, Grapes, Pineapples, Mangoes, Strawberries, Blueberries, Kiwis, etc.
What kind assorted fruits that can be sold in school?There are many different types of fruits that can be sold in schools, depending on availability, seasonality, and local preferences.
The following are some examples of assorted fruits that are commonly sold in schools;
ApplesBananasOrangesGrapesPineapplesMangoesStrawberriesBlueberriesKiwisPapayasWatermelonsCantaloupesHoneydewsPearsPeachesLearn more about fruits here: https://brainly.com/question/27936661
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Which is the electron configuration for bromine?
O
O 1s²2s22p 3s23p64s²3d¹04p5
1s22s22p63s23p64s23d¹04p6
O 1s²2s²2p 3s²3p44s²3d¹04p5
O 1s²2s22p 3s23p64s²3d94p5
The electron configuration for bromine is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵ (option A).
What is electron configuration?Electron configuration is the arrangement of electrons in an atom, molecule, or other physical structure like a crystal.
Electron configuration is a summary of where the electrons are around a nucleus.
The symbols used for writing the electron configuration start with the shell number (n) followed by the type of orbital and finally the superscript indicates how many electrons are in the orbital.
According to this question, the electron configuration of bromine with an atomic number of 35 is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵.
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Which two of the following solutions would be the most effective buffers?
a) 0.5 M NH3 + 1.0 M NH4Cl
b) 1.0 M NH3 + 1.0 M HCl
c) 1.0 M NH3 + 1.0 M HF
d) 0.5 M NH4Cl + 1.0 M NaOH
e) 1.0 M NH4Cl + 0.5 M NaOH
The most effective buffer solutions will have a pKa value close to the desired pH, and will have relatively high concentrations of both the weak acid and its conjugate base. Therefore, options a) and e) are both good buffer solutions.
Option a) contains a weak base (NH3) and its conjugate acid (NH4Cl), and has a pKa of 9.25. Option e) contains a weak acid (NH4Cl) and its conjugate base (NaOH), and has a pKa of 9.25 as well. Hence the correct answer will be a) and e)
Option b) contains a weak base (NH3) and a strong acid (HCl), so it will not be an effective buffer solution. Option c) contains a weak base (NH3) and a weak acid (HF), but the concentration of HF is relatively low, so it will not be an effective buffer solution. Option d) contains a weak acid (NH4Cl) and a strong base (NaOH), so it will not be an effective buffer solution.
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Select the correct order of solubilities of the following iron compounds in water:
Fe(OH)3 Ksp = 2.8 x 10-39
Fe(OH)2 Ksp = 4.9 x 10-17
FeCO3 Ksp = 3.5 x 10-11
- The order of solubilities is Fe(OH)2 < FeCO3 < Fe(OH)3
- The order of solubilities is Fe(OH)3 < Fe(OH)2 < FeCO3
- The order of solubilities is Fe(OH)3 < FeCO3 < Fe(OH)2
- The order of solubilities is FeCO3 < Fe(OH)3 < Fe(OH)2
We can compare the solubility product constants (Ksp) values to establish the correct order of the solubilities of the iron compounds in water. The solubility of the substance in water is inversely correlated with the Ksp value.
Fe(OH)3 Ksp = 2.8 x 10(-39) is provided.
4.9 x 10(-17) Fe(OH)2 Ksp
3.5 x 10(-11) FeCO3 Ksp
Fe(OH)3 has the lowest Ksp value (2.8 x 10(-39)), which indicates the lowest solubility among the three compounds, when the Ksp values are compared. Similarly, FeCO3 is more soluble than Fe(OH)3 and has a higher Ksp value (3.5 x 10(-11)). Fe(OH)2 is the most soluble of the three compounds, as indicated by its greatest Ksp value (4.9 x 10(-17)).
As a result, the iron compounds' solubilities in water should be listed in the following order:
FeCO3 Fe(OH)2 Fe(OH)3
Therefore, "The order of solubilities is Fe(OH)3 FeCO3 Fe(OH)2" is the appropriate response.
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Coordination chemistry has found widespread importance in medicine. One compound that is often used to to remove toxic elements (poisons such as Tl+) in the body is the salt [Fe(OH2)6]4[Fe(CN)6]3.
Using this information which of the following statement is true.
a) [Fe(CN)6]4- has a low-spin Fe2+ ion in an octahedral geometry. This anion allows for exchange of Tl+ with the Fe3+ in [Fe(OH2)6]3+ by releasing [Tl]4[Fe(CN)6] in the urine.
b) [Fe(OH2)6]3+ has a low-spin Fe3+ ion in an octahedral geometry. This anion allows for exchange of Tl+ with the Fe3+ in [Fe(OH2)6]3+ by releasing [Tl]4[Fe(CN)6] in the urine.
c) [Fe(OH2)6]4[Fe(CN)6]3 works by exchanging the toxic Tl+ ion with the [Fe(CN)6] ion and releasing the toxic [Tl]3[Fe(OH2)6] in the urine.
d) [Fe(OH2)6]2+ has a low-spin Fe2+ ion in an octahedral geometry. This allows for exchange of Tl+ with the Fe2+ in [Fe(OH2)6]2+ by releasing [Tl]3[Fe(CN)6] in the urine.
The true statement is [tex][Fe(OH_2)_6]^ 3^+[/tex] has a low-spin [tex]Fe^3^+[/tex] ion in an octahedral geometry. This anion allows for exchange of Tl+ with the [tex]Fe^3^+[/tex] in [tex][Fe(OH_2)_6]^ 3^+[/tex] by releasing [tex]4[Fe(CN)_6][/tex] in the urine.
What is octahedral geometry?Octahedral molecular geometry, also called square bipyramidal, describes the shape of compounds with six atoms or groups of atoms or ligands symmetrically arranged around a central atom, defining the vertices of an octahedron.
The mechanism of action of the compound [tex][Fe(OH_2)_6]_4[Fe(CN)_6]_3[/tex] is an involvement of the exchange of the toxic Tl+ ion with the[tex]Fe^3^+[/tex] ion in [tex][Fe(OH_2)_6]^ 3^+[/tex]
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This is an impossible formula. If it were real, determine the molar mass of:
KBr•8H2O
Answer:
The answer is 223.8g/mol
Explanation:
RMM=1×39.1+1×1×79.9•8(2×1+1×16)
=39.9+79.9•8(2+16)
=119.8•8(18)
=119.8+114
RMM=223.8g/mol
3. A graph of the cooling curve of a pure substance is plotted. When is the graph level with the time axis?(2)
A. Never
B.At the melting point only
C.At the boiling point only
D.At both the melting point and the boiling point
A substance's cooling curve is a graph representing the change in temperature over time as it is allowed to cool. The gradient of the cooling curve is influenced by the heat capacity, thermal conductivity, and ambient temperature of the material. The correct option is A.
The rate of cooling for a sample with a known composition is measured in order to map the phase boundaries on a phase diagram. As the sample (or some piece of it) starts to go through a phase change, the rate of cooling will alter. When the temperature-time curve changes slope, these "breaks" will be visible.
In the cooling curve, the graph never meet with the time axis.
Thus the correct option is A.
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rubidium has two isotope. 85 rb has mass of 84.9117 and 87 rb has a mass of 86.9085 amu. if the average atomic mass of rb is 85.4678 amu. what is the atomic abundance of each isotope?
Answer:
85Rb: 72.15%
87Rb: 27.85%
Explanation:
The average atomic mass of an atom is the sum of all [atomic abundance of isotope]*[mass of isotope].
Rubidium has only two isotopes, so let the atomic abundance of 85Rb be x, thus making the atomic abundance of 87Rb equal to 1-x.
[Average atomic mass of Rb] = [Mass of 85Rb]*[atomic abundance of 85Rb] + [Mass of 87Rb]*[atomic abundance of 87Rb]
85.4678 = 84.9117x + 86.9085*(1-x)
85.4678 = 84.9117x + 86.9085 - 86.9085x
85.4678 = 84.9117x + 86.9085 - 86.9085x
-1.4407 = -1.9968x
Atomic abundance of 85Rb = x = 0.7215 = 72.15%
Atomic Abundance of 87Rb = 1 - x = 1 - 0.7215 = 0.2785 = 27.85%
Classify each of the following molecules as polar or nonpolar.
Drag the appropriate items to their respective bins.
H2O2
NO2
N2H2
CF2
Polar droppable
Nonpolar droppable
A polar molecule is considered polar if it has a net dipole moment, meaning that the electron density is not evenly distributed around the molecule. Both H2O2 and NO2 are polar molecules, while N2H2 and CF2 are nonpolar molecules.
H2O2, or hydrogen peroxide, is a polar molecule due to its bent molecular geometry and the polarity of its O-H bonds. NO2, or nitrogen dioxide, is also a polar molecule because of its bent molecular geometry and the polarity of its N-O bonds. N2H2, or diazene, is a nonpolar molecule because its linear molecular geometry and nonpolar N=N bonds result in an even distribution of electron density. Finally, CF2, or difluoro methylene, is a nonpolar molecule due to its linear molecular geometry and the symmetrical distribution of its polar C-F bonds.
In summary, both H2O2 and NO2 are polar molecules, while N2H2 and CF2 are nonpolar molecules. The polarity of a molecule is an important factor in determining its physical and chemical properties, as well as its interactions with other molecules.
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What happens in a reaction if it is at chemical equilibrium?
Responses
The reaction rates of making products and using reactants are equal.
All of the reactants are used up.
The amount of the product is constantly decreasing.
There are no products in the system.
The reaction can be said to be at equilibrium when the reaction rates of making products and using reactants are equal.
When is a reaction at equilibrium?When the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products don't change over time, a chemical reaction is said to be in equilibrium.
When the system reaches equilibrium, it is in a state of balance, which means that the concentrations of the reactants and products have not changed significantly.
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at a blood bank there are five problems with a labortory technician's work performance the first year of work
The performance of a laboratory technician in a blood bank is crucial as it directly impacts the quality of the blood products and patient safety. If there are five problems with a technician's work performance in the first year of work, it can have serious consequences for the blood bank's operations.
Some of the potential problems that may arise include:
Improper labeling of blood products: This can result in confusion and incorrect transfusions.
Mishandling of blood products: This can lead to contamination, spoilage, or improper storage, which can affect the quality of the blood products.
Failure to follow standard operating procedures: This can result in errors, deviations from protocols, and potential safety hazards.
Poor communication skills: This can result in misunderstandings, delays, and errors in documentation.
Inadequate training or knowledge: This can lead to mistakes, misinterpretation of test results, and failure to recognize potential problems.
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What type of reaction will occur if ΔH is positive and entropy decreases?
Responses
spontaneous reaction
endothermic reaction
Gibbs free reaction
exothermic reaction
The reaction would be an endothermic reaction. Option B
What type of reaction occurs?With a positive H, endothermic processes take in energy from their environment. It is less advantageous for the process if the entropy drops because it indicates that the reactants are getting more organized.
The likelihood of the response happening spontaneously is decreased as a result. The reaction can, however, continue if additional energy is introduced to the system from an outside source as shown.
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Determine whether or not the equation below is balanced. If it isn’t balanced, write the balanced form. Also, identify the reactant(s) and product(s) in this equation. Finally, label this as one of the five types of reactions: combination, decomposition, substitution, double replacement, or reversible.
Zn+HCl→ZnCl2+H2
2. Determine whether or not the equation below is balanced. If it isn’t balanced, write the balanced form. Also, identify the reactant(s) and product(s) in this equation. Finally, label this as one of the five types of reactions: combination, decomposition, substitution, double replacement, or reversible.
S8+24F2→8SF6
3. Calculate the molecular mass of ferric oxide (Fe3O4).
4. Determine the percentage composition of chlorine in CaCl2.
5. Identify the labeled parts in the figure.
i. Which of the labeled parts is a chemical symbol?
ii. Which of the labeled parts is a coefficient?
iii. Which of the labeled parts is the number of atoms of the element?
iv. Which of the labeled parts indicates that only one atom of the element is present in the substance?
1. The equation is not balanced. The balanced equation is: Zn + 2HCl → ZnCl₂ + H₂. Type of reaction is Substitution.
2. The equation S₈+24F₂→8SF₆ is balanced. The Type of reaction is Combination
3. The molecular mass of ferric oxide (Fe₃O₄) is 231.55 g/mol
4. The percentage composition of chlorine in CaCl₂ is 63.88%.
How do we solve for molecular mass and percentage composition?To calculate the molecular mass of ferric oxide (Fe₃O₄)
Molecular mass of Fe₃O₄ = (3 × atomic mass of Fe) + (4 × atomic mass of O)
3 × 55.85 g/mol + 4 × 16.00 g/mol
= 231.55 g/mol
To find the percentage composition of chlorine in CaCl2,
Molecular mass of CaCl₂ =
40.08 g/mol + 2 × 35.45 g/mol
= 110.98 g/mol
70.90 g/mol / 110.98 g/mol × 100
= 63.88%
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1. The equation isn't balanced because there aren't equal numbers of hydrogen or chlorine atoms on both sides of the equation. To correct this, a coefficient of 2 must be placed in front of HCl on the left-hand side of the equation.
ZN + 2HCI → ZnCl2 + H2
Zn and 2HCl are the reactants; ZnCl2 and H2 are the products. This is a substitution reaction because a free element (Zn) replaces another element (H) in a compound.
2. This is a balanced equation because the same types of atoms and the same numbers of each atom are present on both sides of the equation. 8 S atoms are found on both sides of the equation, and 48 F atoms are found on both sides of the equation. S8 and 24F2 are the reactants; 8SF6 is the product. This is a combination reaction because two substances (S8 and 24F2) undergo a chemical union to form a more complex substance (8SF6).
S8 + 24F2 → 8SF6
3. In ferric oxide (Fe3O4), there are 3 atoms of iron (Fe) and 4 atoms of oxygen (O). From the Periodic Table of Elements, we know that the atomic mass of iron is 55.8457 and the atomic mass of oxygen is 15.9994.
Fe3 = 55.8457 × 3 = 167.5371
O4 = 15.9994 × 4 = 63.9976
167.5371 + 63.9976 = 231.5347 (231.535 rounded)
Therefore, the molecular mass of ferric oxide is 231.535.
4. The percentage composition of chlorine in CaCl2 is derived as follows:
The molecular mass of the entire compound is:
Ca = 40.078 × 1 = 40.078
Cl2 = 35.4527 × 2 = 70.9054
40.078 + 70.9054 = 110.9834 (110.983 rounded)
The atomic mass of each element (or its multiple) is divided by the molecular mass of the compound:
Ca = 40.078 ÷ 110.983 = 0.361
Cl2 = 70.9054 ÷ 110.983 = 0.639
Multiplying each by 100 will turn these into percents. Therefore, the percentage composition of chlorine is 63.9%.
5. i. a, c, f, h
ii. e
iii. b, d, g, i
iv. i
500.0 liters of a gas in a flexible-walled container are prepared at 0.92 atm and 473K. The gas is placed into a tank under high pressure. When the tank cools to 293K, the pressure of the gas is 3.0 atm. What is the volume of the gas?
P1V 1 T2=P 2 V 2 T 1
Question 17 options:
48 L
248 L
19 L
95 L
The volume of the gas in the tank at 293K and 3.0 atm pressure is 248 L. Hence, option B is correct.
Given:
T1 = 473K
T2 = 293K
P1 = 0.92 atm
P2 = 3.0 atm
The ideal gas law equation is:
PV = nRT
where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is temperature.
n1 = (PV)/(RT)
= (0.92 atm × 500.0 L)/(0.0821 Latm/molK × 473K)
= 10.42 mol
Use the ideal gas law again to find the final volume of the gas in the tank under high pressure:
V2 = (n1 × R × T2)/P2
= (10.42 mol × 0.0821 Latm/molK × 293K)/(3.0 atm)
= 248 L
Therefore, the volume of the gas in the tank at 293K and 3.0 atm pressure is 248 L.
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Answer:
Using the ideal gas law, PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin, we can solve for n:
n = PV/RT
We know that the initial volume is 500.0 L, pressure is 0.92 atm, and temperature is 473K. We can use this information to find the initial number of moles:
n1 = (0.92 atm x 500.0 L)/(0.08206 L atm/mol K x 473K) = 11.80 mol
Next, we can use the ideal gas law again to find the final volume. We know that the final pressure is 3.0 atm and the final temperature is 293K:
V2 = nRT2/P2
V2 = (11.80 mol x 0.08206 L atm/mol K x 293K)/3.0 atm = 95 L
Therefore, the volume of the gas at the lower temperature and higher pressure is approximately 95 L. Answer: 95 L.
Part A
Review | Constants | Periodic Tab
What volume of 0.205 M K3PO4 solution is necessary to completely react with 114 mL of 0.0118 M NiCl
Express your answer to three significant figures.
Reaction
2 K3PO4 (at) + 3 NiCl2 (aq) arrow Ni3 (PO4)2(s) +6KCl (aq)
The volume of 0.205 M K3PO4 solution necessary to completely react with 114 mL of 0.0118 M NiCl2 solution is 0.00437 L or 4.37 mL
The given chemical equation shows that two moles of K3PO4 react with three moles of NiCl2 to form one mole of Ni3(PO4)2 and six moles of KCl. Thus, the stoichiometric ratio of K3PO4 to NiCl2 is 2:3.
To calculate the volume of K3PO4 solution required to completely react with 114 mL of 0.0118 M NiCl2 solution, we need to use the concept of stoichiometry and the equation of concentration, C = n/V, where C is the concentration in moles per liter (M), n is the amount in moles, and V is the volume in liters.
First, we can calculate the amount of NiCl2 in 114 mL of 0.0118 M solution:
n(NiCl2) = C × V = 0.0118 M × 0.114 L = 0.0013452 mol
Next, we can use the stoichiometric ratio to calculate the amount of K3PO4 required:
n(K3PO4) = (2/3) × n(NiCl2) = (2/3) × 0.0013452 mol = 0.0008968 mol
Finally, we can use the equation of concentration to calculate the volume of 0.205 M K3PO4 solution required:
V(K3PO4) = n(K3PO4) / C(K3PO4) = 0.0008968 mol / 0.205 M = 0.00437 L
Therefore, the volume of 0.205 M K3PO4 solution necessary to completely react with 114 mL of 0.0118 M NiCl2 solution is 0.00437 L or 4.37 mL (to three significant figures).
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