125 grams of HCl are used. Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g). What is the percent yield if 1.2 moles of hydrogen are actually produced?
Answers
Answer:
70%
Explanation:
To find the percent yield, you need to (1) convert grams HCl to moles (via molar mass from periodic table), then (2) convert moles HCl to moles H₂ (via mole-to-mole ratio from equation), then (3) calculate the percent yield H₂ (via percent yield equation).
Zn (s) + 2 HCl (aq) --> ZnCl₂ (aq) + 1 H₂ (g)
Molar Mass (HCl): 1.008 g/mole + 35.45 g/mole
Molar Mass (HCl) = 36.458 g/mole
125 g HCl 1 mole HCl 1 mole H₂
--------------- x ------------------ x ------------------ = 1.7 moles H₂
36.458 g 2 moles HCl
(actual yield / theoretical yield) x 100% = percent yield
theoretical/calculated yield = 1.7 moles H₂
actual yield = 1.2 moles H₂
(1.2 moles H₂ / 1.7 moles H₂) x 100% = 71%
Therefore, the best percent yield of hydrogen produced is 70%.
Related Questions
Indicate how the gas molecules move between the system and the surroundings based on changes in pressure, temperature, and volume and the number of moles.
Answers
The gas molecules move between the system and the surroundings follow PV=nRT.
What are molecules?The smallest particle of a substance has all of the physical and chemical properties of that substance.
An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.
In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.
The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.
At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.
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Can someone please help? This is super hard!!
Answers
Answer:
what is super hard?
Explanation:
what?
Use the drop-down menus to identify each organic reaction as an addition, substitution, elimination, or condensation reaction. (C H 3) subscript 3 C O H plus C H 3 O H right arrow (C H 3) subscript 3 C O C H 3 plus H 2 O. H 3 C H C double bond C H C H 3 plus H upper B r right arrow C H 3 C H 2 C H (upper B r) C H 3. (C H 3) subscript 3 C O H right arrow C H 3 C H 3 C H 2 plus H 2 O. A benzene ring plus upper B r subscript 2 right arrow benzene ring with upper B r bonded to the top, plus upper H upper B r.
Answers
A chemical reaction involves an interaction between two or more species to yield a product.
What is a chemical reaction?A chemical reaction involves an interaction between two or more species to yield a product.
The following is the classification of the reactions based on type;
The first reaction shown in the attachment is a condensation reactionThe second reaction is an addition reactionThe third reaction is an elimination reactionThe fourth reaction is a substitution reactionLearn more about reaction:https://brainly.com/question/9524025
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How many moles are 3.20 x102 formula units of calcium iodide?
Answers
The number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.
How to calculate number of moles?The number of moles in the formula units of a substance is calculated by dividing the formula unit by Avogadro's number.
According to this question, 3.20 x 10² formula units are in calcium iodide. The number of moles is as follows:
no of moles = 3.20 x 10²² ÷ 6.02 × 10²³
no of moles = 0.53 × 10-¹
no of moles = 0.053 moles
Therefore, the number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.
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Which formula represents a hydrocarbon?
A. CaO2
B.C5H12
C.CH2O
D.H2SO4
Answers
Answer:
B.C5H12 that is pentane
Explanation:
hydrocarbon has only hydrogen and carbon atoms
In a certain reaction at stp, 29.2 l of methane is combusted
with 63.3 l of oxygen.
what volume of excess reactant remains after the reaction is
complete?
Answers
The volume of excess oxygen will 2.28 L
Stoichiometric calculationFrom the equation of the reaction:
[tex]CH_4(g) + 2O_2(g) --- > CO_2(g) + 2H_2O(g)[/tex]
The mole ratio of the two reactants is 1:2.
1 mole of gas at STP = 22.4 L
Mole of 29.2 L of methane at STP = 29.2/22.4 = 1.3 moles
Mole of 63.3 L of oxygen at STP = 63.3/22.4 = 2.8 moles.
Thus, oxygen is in excess because 1.3 x 2 = 2.6 moles is needed to react with 1.3 moles methane.
Excess mole of oxygen = 2.8 - 2.6 = 0.2 moles
Volume of 0.2 moles at STP = 22.4 x 0.2 = 2.28 L
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Which statement
about
gravitational force is most
accurate?
Answers
Gravitational force is the force of attraction. This kind of force forms an action-reaction in a situation.
What is gravitational force?Gravitational force is the force present that is directly proportional to the masses and inversely to the square of the distance present from the center of the masses.
It is independent of the medium and remains constant in any matter whether it is water, air, or soil. It is conservative and is a central force that obeys Newton's law of motions.
Therefore, the gravitational force follows the action and reaction.
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Hemoglobin ___________. (Select all that apply).
returns carbon dioxide to your lungs to be exhaled
carries oxygen from your lungs to every cell in the body
is the most complex protein in your body
is not made up of amino acids
Answers
Answer:
Option B and A
Explanation:
First our lungs take purified oxygen from air then provide it to heartOur heart gives oxygen to hemoglobin which is present in our bloodIt carries oxygen to all cellsand comes back with cO_2In one to two sentences, describe an experiment that would show that intramolecular forces (attractions between atoms within molecules) are stronger than intermolecular forces (attractions between molecules).
thank you !!
Answers
short story about The Blind Date by Jeffrey Archer
Calculation: If a compound is 14.40% hydrogen by mass and 85.60% carbon by mass, what is the empirical formula?
Group of answer choices
Answers
Answer:
CH2
Explanation:
We are given that a compound is 14.40% hydrogen and 85.60% carbon.
Let the mass of the substance be 100g.
Mass of the hydrogen: 14.40% of 100 = 14.40 g
Mass of the carbon: 85.60% of 100 = 85.60 g
Now, let's find the moles of hydrogen:
[tex]14.40 g*\frac{1 mole}{1gH} = 14.40 mole[/tex]
Moles of carbon:
[tex]85.60g*\frac{1 mol}{12gC} = 7.13mol[/tex]
Let's put these in a ratio and simplify:
7.13 mole C: 14.40 mole H
1 mole C: 2 mole H
Therefore, the empirical formula of this compound is CH2.
Hope this helps!! If you have any questions about my work, please let me know in the comments!
Determine the rate of a reaction that follows the rate law: rate = k[A]m[B]n, where:
k=1.5
[A]=1M
[B]=3m
m=2
n=1
A. 4.5 (mol/L)/s
B. 1.5 (mol/L)/s
C. 13.5 (mol/L)/s
D. 9.0 (mol/L)/s
Answers
The rate of a reaction that follows the rate law: rate = k[A]m[B]n, is A. 4.5 (mol/L)/s.
What is the rate of reaction?The rate of reaction is the speed by which the reactions happening.
The given values are k=1.5.
[A]=1M
[B]=3m
m=2
n=1
The formula is v = k[A] ˣ [B] y
v = 1.5 x 1 ² x 3¹ = 4.5 (mol/L)/s
Thus, the correct option is A. 4.5 (mol/L)/s.
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what is the molarity of 28.9g of calcium chloride dissolved in water to make 0.78L of solution
Answers
Answer:
.334 M
Explanation:
Ca Cl2 is calcium chloride
Ca = 40.078 gm/mole
Cl = 35.45 gm/ mole
40 . 078 + 2 * 35.45 = 110.978 gm/mole for Ca Cl2
28.9 gm / 110.978 gm/mole = .260 moles CaCl2
.260 moles/ .78 liter = .334 M
2. calcium reacts with oxygen to produce calcium oxide what is the :reactant' :products' and chemical equation" of this problem
Answers
Answer:
Calcium reacts with Oxygen to form Calcium Oxide
Explanation:
Reactant: Calcium reacts with Oxygen to form Calcium Oxide
Products: Calcium + Oxygen
Chemical equation: Ca + 02> CaO
Caco3(s) ----> cao(s) + co2 (g)
this reaction is not spontaneous at room temperature. what is the sign of ah for this reaction? explain how you arrived at your answer
Answers
Since the reaction is not spontaneous at room temperature, the ΔH will be positive.
What are spontaneous reactions?They are reactions that require no additional effort in order for them to take place under certain conditions.
For spontaneous reactions, the change in the energy of the system, otherwise known as ΔH, is always negative. On the other hand, reactions with positive ΔH are non-spontaneous.
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Can someone please help????nThis is sooooo hard
Answers
Answer:
See explanation.
Explanation:
I highly suggest you watch OChem Tutor's videos on IUPAC nomenclature because the actual naming would take a lot of time to teach in text-based format. But here is how to name them:
1) I think there are two seperate pictures for number 1. The molecule on the left is 1-pentene and the one on the right is 4-methyl-1-pentene. If the whole thing is one molecule but there is just a bond missing where the red marker numbers are, that molecule would be 9-methyl-1,6-decadiene.
2) 4-methyl-2-pentene
3) 2,4-octadiene
4) 1,5-nonadiene
5) 2,5-dimethyl-3-hexene
6) 3,6-dimethyl-2,4-heptadiene
7) 2,5,5-trimethyl-2-hexene
Which type of energy resource does not use a turbine to generate electricity?
A. Petroleum
B. Sunlight
C. Biomass
D. Coal
Answers
Answer:
B
Explanation:
The answer is sunlight solar cells directly convert the sunlight into electricity
Answer:
B
Explanation:
Sunlight, or solar energy is the type of energy which is not used by a turbine to generate electricity.
Blank? mammals are the largest group of mammals.
Answers
Answer:
Blank = rodent(s)
Explanation:
Rodents are by far the largest group of mammals.
Identify the polarity of an H-I bond and the polarity of an S-S bond?
Answers
Answer:
5095 JULLITET LI\
Explanation:
CORRWCT ANSWER GETS BRAINLIST
Answers
Answer:
Parts per million - Option B
Explanation:
Is it possible to explain this ?
Hope this helped and have a good day
Answer: b parts per million
Explanation:
Compare how entropy changes for the following two systems:
System A: Two gases mix when the valve separating two containers is opened.
System B: A solid powder decomposes to form a solid product and a gas product.
Answers
The measure of the randomness of the system is the change in the entropy. The mixing of two gases and decomposition of the solid will increase the entropy.
What is entropy?Entropy is the disorderliness and the randomness of the system when the thermal energy is not present in a sufficient amount to initiate the reaction. In system A, when two gases are mixed then the entropy increases as the number of gaseous molecules increases.
In system B, when a solid powder gets decomposed to form a solid product and a gaseous product the entropy increases as along the solid particles the gas is also produced.
Therefore, in both the systems the entropy increases.
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How can you determine whether a solution is acidic or basic?
Answers
Answer:
Look at the pH level.
Explanation:
The best way to determine whether a solution is acidic or basic is to look at its pH level. The pH of a solution is a number between 0 and 14.
If a solution has a pH of less than 7, then it is acidic.
If a solution has a pH of 7, then it is neutral.
If a solution has a pH of greater than 7, then it is basic.
hope this helps!! p.s. i really need brainliest :)
elect all statements that correctly describe the stability of eclipsed and staggered conformers. Multiple select question. Staggered conformers are lower in energy than eclipsed conformers. Electron-electron repulsion between bonds in an eclipsed conformer may contribute to the low energy of this conformer. Staggered conformers possess torsional strain. Eclipsed conformers possess torsional strain.
Answers
Staggered conformers are lower in energy than eclipsed conformers , Option A is the right answer.
What are Eclipsed and Staggered Confirmation ?The arrangement of atoms in molecule such that the dihedral angle formed is 60 degree is called Staggered Conformation and the arrangement of atoms in which the dihedral angle is 0 degree is called Eclipsed Confirmation
Among the given statements
The statement that best describe the stability of Staggered Conformers and eclipsed conformers is Staggered conformers are lower in energy than eclipsed conformers .
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What is the total number of protons and electrons in one mole of hydrogen gas?
Answers
Can someone please help? THIS IS SUPER HARD!!!!!!!
Answers
Organic compounds including carboxylic acids are named uisng IUPAC nomenclature technique.
What are Carboxylic acids ?
A carboxylic acid is an organic acid that contains a carboxyl group (C(=O)OH) attached to an R-group.
The general formula of a carboxylic acid is R−COOH or [tex]RCO_2H[/tex], with R referring to the alkyl, alkenyl, aryl, or other group.
Following are the names of given struture ;
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The descriptions below explain two ways that water is used by plants on a sunny day.
I. In a process called transpiration, some liquid water in leaves changes to water vapor. The water vapor is released into the air through tiny pores in the leaves. This allows more liquid water from the soil to be pulled up the roots and stem to replace water lost from the leaves.
II. Plants use some of this water in leaves in a process called photosynthesis. During photosynthesis, water and carbon dioxide break apart and recombine to form two new substances, oxygen and glucose.
Answers
In a sunny day, the plant makes use of water through photosynthesis and transpiration.
What is photosynthesis?Photosynthesis is defined as the process by which green plants, which has chlorophyll, makes use of water and carbondioxide in the presence of sunlight as energy to form oxygen and glucose.
Transpiration is the movement is of water out of the plant through its pores located on the leaves, roots and stem. This process is increased in sunny seasons.
Therefore, In a sunny day, the plant makes use of water through photosynthesis and transpiration.
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Answer:
in transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change.
Explanation:
A chemical reaction can be reversed if?
Question 18 options:
The energy of the products exceeds the activation energy threshold.
The energy of the reactants exceeds the activation energy threshold.
The energy of the products is less than the activation energy threshold.
The energy of the reactants is less than the activation energy threshold.
Answers
Explanation:
To a reaction to be occured
The formula is
TE=IE+AEIE<TE+AEIE is internal energy of reactant and AE is activation energy and TE is threshold energy .
So option D is correct
72. how is it possible to recognize the end point of a titration?
Answers
A small, positively charged ball is moved close to a large, positively charged ball. Which describes how the small ball likely responds when it is released?
Answers
Answer:
It is repelled ( pushed away from the larger ball)
Explanation:
Like charges repel.
Opposites attract.
In a single displacement recation of magnesium + copper sulfate. What reactant loses electrons and why?
Answers
Calculate the molarity of a sodium hydroxide solution if 50.0 mL of this solution was completely neutralized by 46.6 mL of 0.750 M sulfuric acid.
Answers
Answer: 0.699 M
Explanation:
[tex]M_{A}V_{A}=M_{B}V_{B}\\(0.750)(46.6)=M_{B}(50.0)\\M_{B}=\frac{0.750)(46.6)}{50.0}=\boxed{0.699 \text{ M}}[/tex]