The actual yield of a product in a reaction was measured as 1.20 g. If the theoretical yield of the product for the reaction is 1.82 g, what is the percentage yield of the product? 65.9% 67.2% 71.9% 73.3% A chemist wants to extract copper metal from copper chloride solution. The chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (II) chloride. A single replacement reaction takes place. Which statement explains the maximum amount of copper that the chemist can extract using this reaction? Unbalanced equation: CuCl2 + Al → AlCl3 + Cu Approximately 0.36 grams, because copper (II) chloride acts as a limiting reactant Approximately 1.8 grams, because copper (II) chloride acts as a limiting reactant Approximately 0.36 grams, because aluminum acts as a limiting reactant Approximately 1.8 grams, because aluminum acts as a limiting reactant How many moles of Ca(OH)2 are present in 370.47 grams of Ca(OH)2? 2 3 5 6 Which pair of compounds have the same empirical formula? CH and C2H2 C2H6 and CH C3H8 and C3H C2H2 and C2H A synthesis reaction takes place when carbon monoxide (CO) and hydrogen gas (H2) react to form methanol (CH3OH). How many grams of methanol are produced when 7.0 grams of carbon monoxide reacts with 2.5 grams of hydrogen gas? 7.0 grams 8.0 grams 15 grams 20 grams Which of the following is necessary to do a complete stoichiometric calculation? Write the mole ratio. Add the nuclear masses of the products. Divide the nuclear masses of the reactants. Write the number of atoms in one mole of the product. One mole of silver has a mass of 107.9 grams. Approximately how many atoms of silver are present in one mole of silver? 107 atoms 108 atoms 6 × 1023 atoms 53 × 1023 atoms Which of the following best defines the molar mass of a substance? Mass, in grams, of each particle of the substance Total mass, in grams, of 100 particles of the substance Mass, in grams, of the nucleus of the substance's atoms Total mass, in grams, of all the particles in one mole of the substance How many atoms of Ca are present in 80.156 grams of Ca? 1.2044 × 1024 2.4088 × 1024 4.8270 × 1025 1.9346 × 1027 What is the percentage composition of each element in hydrogen peroxide, H2O2? 7.01% H and 92.99% O 7.22% H and 92.78% O 6.32% H and 93.68% O 5.88% H and 94.12% O The following reaction shows calcium chloride reacting with silver nitrate. CaCl2 + 2AgNO3 → 2AgCl + Ca(NO3)2 How many grams of AgCl are produced from 30.0 grams of CaCl2? (Molar mass of Ca = 40.078 g/mol, Cl = 35.453 g/mol, O = 15.999 g/mol, Ag = 107.868 g/mol, N = 14.007 g/mol) 19.4 grams 38.8 grams 58.2 grams 77.5 grams How many moles of water are produced when 3.0 moles of hydrogen gas reacts with 1.8 moles of oxygen gas? Balanced equation: 2H2 + O2 → 2H2O 3.0 moles of water 3.6 moles of water 5.3 moles of water 7.0 moles of water Read the given chemical reaction. C2H6 + O2 → CO2 + H2O How many moles of H2O are produced during the complete combustion of 1.4 moles of C2H6? 2.8 moles 4.2 moles 5.6 moles 7.0 moles Which formula can be used to calculate the molar mass of ammonia (NH3)? molar mass of N + molar mass of H 3 × molar mass of N + molar mass of H molar mass of N + 3 × molar mass of H 3 × molar mass of N + 3 × molar mass of H Which of the following statements best defines the theoretical yield of a reaction? The ratio of measured yield over actual yield The amount of product measured after a reaction The ratio of measured yield over stoichiometric yield The maximum amount of product that can be obtained Which of the following is true for an excess reactant? It is the reactant whose atoms remain unbalanced in the equation. It is the reactant that produces a smaller amount of a product. It is the reactant that is left over after the reaction stops. It is the reactant that produces one mole of a product. What is the volume of 1.60 grams of O2 gas at STP? 1.72 liters 1.45 liters 1.32 liters 1.12 liters A heating curve has two flat lines or plateaus. What does the plateau at the lower temperature represent? Boiling of a liquid Melting of a solid Increase in temperature of a substance Decrease in temperature of a substance The volume of a gas at 6.0 atm is 2.5 L. What is the volume of the gas at 7.5 atm at the same temperature? 1.0 L 1.5 L 2.0 L 3.0 L A list of changes is shown. Temperature decreases Intermolecular bonds become weaker Freezing Intermolecular bonds become stronger Evaporation Temperature increases The movement of molecules slows down Molecules vibrate faster Which of the above changes would be accompanied by a decrease of the kinetic energy of particles in a liquid? A, B, C, and H A, C, D, and G B, E, F, and H B, C, F, and G
The actual yield of a product in a reaction was measured as 1.20 g. If the theoretical yield of the product for the reaction is 1.82 g, what is the percentage yield of the product?
65.9%
67.2%
71.9%
73.3%
A chemist wants to extract copper metal from copper chloride solution. The chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (II) chloride. A single replacement reaction takes place. Which statement explains the maximum amount of copper that the chemist can extract using this reaction?
Unbalanced equation: CuCl2 + Al → AlCl3 + Cu
Approximately 0.36 grams, because copper (II) chloride acts as a limiting reactant
Approximately 1.8 grams, because copper (II) chloride acts as a limiting reactant
Approximately 0.36 grams, because aluminum acts as a limiting reactant
Approximately 1.8 grams, because aluminum acts as a limiting reactant
How many moles of Ca(OH)2 are present in 370.47 grams of Ca(OH)2?
2
3
5
6
Which pair of compounds have the same empirical formula?
CH and C2H2
C2H6 and CH
C3H8 and C3H
C2H2 and C2H
A synthesis reaction takes place when carbon monoxide (CO) and hydrogen gas (H2) react to form methanol (CH3OH). How many grams of methanol are produced when 7.0 grams of carbon monoxide reacts with 2.5 grams of hydrogen gas?
7.0 grams
8.0 grams
15 grams
20 grams
Which of the following is necessary to do a complete stoichiometric calculation?
Write the mole ratio.
Add the nuclear masses of the products.
Divide the nuclear masses of the reactants.
Write the number of atoms in one mole of the product.
One mole of silver has a mass of 107.9 grams. Approximately how many atoms of silver are present in one mole of silver?
107 atoms
108 atoms
6 × 1023 atoms
53 × 1023 atoms
Which of the following best defines the molar mass of a substance?
Mass, in grams, of each particle of the substance
Total mass, in grams, of 100 particles of the substance
Mass, in grams, of the nucleus of the substance's
Total mass, in grams, of all the particles in one mole of the substance
How many atoms of Ca are present in 80.156 grams of Ca?
1.2044 × 1024
2.4088 × 1024
4.8270 × 1025
1.9346 × 1027
What is the percentage composition of each element in hydrogen peroxide, H2O2?
7.01% H and 92.99% O
7.22% H and 92.78% O
6.32% H and 93.68% O
5.88% H and 94.12% O
The following reaction shows calcium chloride reacting with silver nitrate.
CaCl2 + 2AgNO3 → 2AgCl + Ca(NO3)2
How many grams of AgCl are produced from 30.0 grams of CaCl2?
(Molar mass of Ca = 40.078 g/mol, Cl = 35.453 g/mol, O = 15.999 g/mol, Ag = 107.868 g/mol, N = 14.007 g/mol)
19.4 grams
38.8 grams
58.2 grams
77.5 grams
How many moles of water are produced when 3.0 moles of hydrogen gas reacts with 1.8 moles of oxygen gas?
Balanced equation: 2H2 + O2 → 2H2O
3.0 moles of water
3.6 moles of water
5.3 moles of water
7.0 moles of water
Read the given chemical reaction.
C2H6 + O2 → CO2 + H2O
How many moles of H2O are produced during the complete combustion of 1.4 moles of C2H6?
2.8 moles
4.2 moles
5.6 moles
7.0 moles
Which formula can be used to calculate the molar mass of ammonia (NH3)?
molar mass of N + molar mass of H
3 × molar mass of N + molar mass of H
molar mass of N + 3 × molar mass of H
3 × molar mass of N + 3 × molar mass of H
Which of the following statements best defines the theoretical yield of a reaction?
The ratio of measured yield over actual yield
The amount of product measured after a reaction
The ratio of measured yield over stoichiometric yield
The maximum amount of product that can be obtained
Which of the following is true for an excess reactant?
It is the reactant whose atoms remain unbalanced in the equation.
It is the reactant that produces a smaller amount of a product.
It is the reactant that is left over after the reaction stops.
It is the reactant that produces one mole of a product.
What is the volume of 1.60 grams of O2 gas at STP?
1.72 liters
1.45 liters
1.32 liters
1.12 liters
A heating curve has two flat lines or plateaus. What does the plateau at the lower temperature represent?
Boiling of a liquid
Melting of a solid
Increase in temperature of a substance
Decrease in temperature of a substance
The volume of a gas at 6.0 atm is 2.5 L. What is the volume of the gas at 7.5 atm at the same temperature?
1.0 L
1.5 L
2.0 L
3.0 L
A list of changes is shown.
- Temperature decreases
- Intermolecular bonds become weaker
- Freezing
- Intermolecular bonds become stronger
- Evaporation
- Temperature increases
- The movement of molecules slows down
- Molecules vibrate faster
Which of the above changes would be accompanied by a decrease of the kinetic energy of particles in a liquid?
A, B, C, and H
A, C, D, and G
B, E, F, and H
B, C, F, and G
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