Concept explainers
Interpretation:
The reactant present in excess and the mass of the reactant needs to be determined.
Concept introduction:
Excess reactant is the reactant which is present in excess amount and left over after completion of reaction.
Answer to Problem 119A
Excess reactant is the reactant which is present in excess amount and left over after completion of reaction.
Hydroquinone is excess reactant. 45.1 mg of hydroquinone was left.
Explanation of Solution
Molecular mass of hydroquinone is 110 g/mol.
Or,
The
From the stoichiometry of reaction.
For hydroquinone,
For H2O2,
The reactant which produces least amount of product is limiting reagent. So,
The excess hydroquinone = total mmoles of hydroquinone − mmoles of hydroquinone consumed
= 0.9- 0.49
= 0.41 mmoles
Mass of hydroquinone left
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Glencoe Chemistry: Matter and Change, Student Edition
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