If 39.3 g of As reacts with excess NaOH at STP, what volume of [tex]H_2[/tex] will be produced in liters?

\[ 2 \text{ As (s)} + 6 \text{ NaOH (aq)} \rightarrow 2 \text{ Na}_3\text{AsO}_3 \text{ (s)} + 3 \text{ H}_2 \text{ (g)} \]

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given reaction as per stoichiometry, 149.84 g of As produces 6 g hydrogen , thus, 39.3 g of As will produce 39.3×6/149.84=1.573 g.

As per STP conditions, V=1.573/2×8.314×273/1=1785.90 liters.

Thus, 1785.90 liters of hydrogen is produced.

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If 39.3 g of As reacts with excess NaOH at STP, what volume of [tex]H_2[/tex] will be produced in liters?\[ 2 \text{ As (s)} + 6 \text{ NaOH (aq)} \rightarrow 2 \text{ Na}_3\text{AsO}_3 \text{ (s)} + 3 \text{ H}_2 \text{ (g)} \]

Answer :

What is stoichiometry?

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If 39.3 g of As reacts with excess NaOH at STP, what volume of [tex]H_2[/tex] will be produced in liters?

\[ 2 \text{ As (s)} + 6 \text{ NaOH (aq)} \rightarrow 2 \text{ Na}_3\text{AsO}_3 \text{ (s)} + 3 \text{ H}_2 \text{ (g)} \]