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| 1 | |
What is meant by the phrase "the reactants are present in stoichiometric amounts"? |
| | A) | The reactants are present in equal molar amounts. |
| | B) | The same mass of each of each reactant is present. |
| | C) | The reactants are present in the mole ratio that corresponds to the ratio of the coefficients in the balanced chemical equation. |
| | D) | The reactants are present in the mass ratio that corresponds to the ratio of the coefficients in the balanced chemical equation. |
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| 2 | |
In which case are the reactants present in the stoichiometric amounts for the following reaction?
2 N2(g) + 3 H2(g) → 2 NH3(g) |
| | A) | 0.4 mol of N2 and 0.6 mol of H2 |
| | B) | 6 g of N2 and 9 g of H2 |
| | C) | 5 mol of N2 and 5 mol of H2 |
| | D) | 2 g of N2 and 3 g of H2 |
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| 3 | |
The limiting reactant in a chemical reaction |
| | A) | is the reactant present in the least amount by mass |
| | B) | determines the amount of product formed |
| | C) | is the reactant present in the least molar amount |
| | D) | is left over at the end of the reaction |
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| 4 | |
Acetylene (C2H2) is burned with oxygen in a blow torch according to the equation
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If there is 0.100 mol of acetylene and 0.300 mol of oxygen, which reactant is limiting? |
| | A) | C2H2 |
| | B) | O2 |
| | C) | CO2 |
| | D) | H2O |
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| 5 | |
Ethane (C2H6), an important component of natural gas, burns according to the following balanced equation:
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If there is 0.100 mol of ethane and 0.300 mol of oxygen, which reactant is limiting? |
| | A) | C2H2 |
| | B) | O2 |
| | C) | CO2 |
| | D) | H2O |
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| 6 | |
When performing a stoichiometric calculation, how do you know when you need to identify the limiting reagent? |
| | A) | You are given information regarding the first reactant. |
| | B) | You are given information regarding the second reactant. |
| | C) | You are given information regarding a product formed. |
| | D) | You are given information regarding two or more reactants. |
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| 7 | |
When performing a stoichiometric calculation to determine the amount of CO2 produced by the combustion in air of 4kg of methane, what do you assume? |
| | A) | There is also 4 kg of oxygen present. |
| | B) | The question is incomplete. More information is required to do the calculation. |
| | C) | The amount of oxygen present is not mentioned therefore it is not the limiting reactant. |
| | D) | The amount of oxygen present is not mentioned therefore it is the limiting reactant. |
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| 8 | |
What mass of solid AgCl is produced when 0.200 mol of Ag+ ions are mixed with 0.300 mol of Cl- ions in the following reaction (the molar mass of AgCl is 143.32 g/mol) Ag+(aq) + Cl-(aq) → AgCl(s) |
| | A) | 71.7 g |
| | B) | 35.8 g |
| | C) | 43.0 g |
| | D) | 28.7 g |
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| 9 | |
What mass of solid Ag2S is produced when 0.200 mol of Ag+ ions is mixed with 0.300 mol of S2-ions in the following reaction (the molar mass Ag2S is 247.81 g/mol): Ag+(aq) + S2-(aq) → Ag2S(s) |
| | A) | 24.8 g |
| | B) | 37.2 g |
| | C) | 49.6 g |
| | D) | 74.3 g |
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