Concept explainers
(a)
Interpretation: The number of moles of oxygen gas should be calculated.
Concept Interpretation: The number of moles can be calculated using the following relation:
Here, m is mass in grams and M is molar mass is g/mol.
0.9 mol
The balanced
From the balanced chemical reaction, 1 mol of
(b)
Interpretation: The mass of water produced should be calculated.
Concept Interpretation: The number of moles can be calculated using the following relation:
Here, m is mass in grams and M is molar mass is g/mol.
The mass can be calculated by rearranging the above reaction as follows:
18 g
The balanced chemical reaction is as follows:
The mass of oxygen gas is 64 g. Molar mass of oxygen gas is 32 g/mol thus, number of moles can be calculated as follows:
Putting the values,
4 mol of oxygen gas produces 2 mol of water thus, 1 mol of oxygen gas produce
Molar mass of water is 18 g/mol thus, mass of water can be calculated as follows:
Putting the values,
Thus, mass of water is 18 g.
(c)
Interpretation: The mass of carbon dioxide produced should be calculated.
Concept Interpretation: The number of moles can be calculated using the following relation:
Here, m is mass in grams and M is molar mass is g/mol.
The mass can be calculated by rearranging the above reaction as follows:
The balanced chemical reaction is as follows:
The mass of
Putting the values,
1 mol of
Molar mass of carbon dioxide is 44.01 g/mol thus, mass can be calculated as follows:
Putting the values,
Thus, mass of carbon dioxide is
(d)
Interpretation: The percent yield of carbon dioxide should be calculated.
Concept Interpretation: The relation between number of moles and mass of any substance is as follows:
Here, m is mass in grams and M is molar mass is g/mol.
The reactant that limits the amount of product formed in the reaction is known as limiting reactant. The amount of product formed from limiting reactant is known as theoretical yield. The percent yield can be calculated as follows:
Mass of carbon dioxide is 186 g.
This is the actual yield.
The percentage yield can be calculated as follows:
Putting the values,
Therefore, percent yield is
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