# What mass (in grams) of {eq}KNO_3 {/eq} would have to be decomposed to produce {eq}29 \ L {/eq} of oxygen measured at {eq}STP {/eq} ?

## Question:

What mass (in grams) of {eq}KNO_3 {/eq} would have to be decomposed to produce {eq}29 \ L {/eq} of oxygen measured at {eq}STP {/eq} ?

## Stoichiometry:

The calculation regarding the chemical reaction is done in the stoichiometry. The mass of either product or reactant, percent yield, limiting reactant, excess reactant and balanced chemical reaction determined in the stoichiometry. The amount of products or reactants determined using the given amount of one reactant or product is called stoichiometry.

The balanced reaction is important in the stoichiometry since the mole ratio between the reactant and product is required to determine the mole of the unknown once.

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We are given,

• Volume of {eq}O_2 {/eq} = 29 L

The Balanced reaction is,

{eq}2 \ KNO_3 \rightarrow 2 \ KNO_2 + O_2 {/eq}

The volume of the...