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2 As (s) + 6 NaOH (aq) → 2 Na3AsO3 (s) + 3 H2 (g)

If 39.3 g of As reacts with excess NaOH at STP, what volume of H2 will be produced in liters?

Answer :

The volume of the hydrogen gas is 17.6 L.

What is the volume of the hydrogen gas that is produced?

We know that the volume of the hydrogen that we can get using the stoichiometry of the reaction and that is what we are going to do here. We can see that from the question, we have;

Number of moles of the Arsenic = 39.3g /75 g/mol

= 0.524 moles

We have;

2 moles of arsenic produces 3 moles of hydrogen

0.524 moles of arsenic produces x moles of hydrogen

x = 0.524 moles * 3 moles/ 2 moles

= 0.786 moles

Mass of the oxygen = 0.786 moles * 22.4 L

= 17.6 L

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