Interpretation:
The information required to solve a volume-mass problem that involves gases is to be written.
Concept introduction:
It is based on

Answer to Problem 81A
To solve a volume-mass problem, firstly equation should be balanced. Secondly information about mass or moles of one of the reactant or product should be known. Thirdly conditions of temperature and pressure should be specified for necessary calculations.
Explanation of Solution
A balanced chemical equation gives the quantitative relationship of volumes between various reactants and products. Thus it is necessary to balance a chemical equation before using relative gas volume relationships.
Further to apply
Then value of T and P helps to calculate variables involved in ideal gas for other reactants and products involved.
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