a.
Interpretation: To determine the gas that is a limiting reactant.
Concept Introduction: A mole is
The formation of products is dependent on the number of reactants. The reactant that is consumed first is known as the limiting reactant, when this reactant is consumed completely, then there will be no more formation of products.
a.
Answer to Problem 109A
The limiting reactant is hydrogen gas.
Explanation of Solution
The amount of oxygen is
The amount of hydrogen is
In order to find the limiting reactant, calculate the number of moles of oxygen and hydrogen gas.
Calculation for moles of oxygen is calculated as follows:
Calculation for moles of hydrogen is calculated as follows:
The moles of hydrogen is less. Thus, the limiting reagent is hydrogen.
b.
Interpretation: To calculate the mass of water.
Concept Introduction: A mole is
The coefficients are the numbers that are written in front of the chemical formula/symbol in order to balance a
b.
Answer to Problem 109A
The amount of water is
Explanation of Solution
The amount of water can be calculated as follows:
c.
Interpretation: To give the name of the gas that is present after the reaction.
Concept Introduction: A mole is
The formation of products is dependent on the number of reactants. The reactant that is consumed first is known as the limiting reactant, when this reactant is consumed completely, then there will be no more formation of products.
c.
Answer to Problem 109A
The gas that is still present in the reaction is oxygen gas.
Explanation of Solution
The limiting reagent of this reaction is hydrogen gas which means oxygen gas is still present in the reaction and behaves as an excess reagent.
d.
Interpretation: To calculate the volume of gas at STP.
Concept Introduction: A mole is
The coefficients are the numbers that are written in front of the chemical formula/symbol in order to balance a chemical reaction. The coefficients help in determining the conversion factors between the number of moles for two different substances in a chemical equation.
d.
Answer to Problem 109A
The volume of the remaining gas at STP is
Explanation of Solution
The number of moles of oxygen gas present can be calculated as follows:
Excess amount of oxygen can be given as:
The volume of the remaining gas can be calculated as follows:
Chapter 15 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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