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When hydrochloric acid reacts with sodium sulfide, hydrogen sulfide gas and sodium chloride are produced. How many moles of H2S will be generated by 2.56 moles of HCl?

Verified Answer :

The balanced equation that shows the stoichiometric reaction between sodium sulfide and hydrochloric acid to produce hydrogen sulfide gas and sodium chloride is Na2S+ 2HCl = 2 NaCl + H2S. Thus for every two moles of HCl, 1 mole of H2s gas is generated. In this case, when 2.56 moles of HCl is used,  1.28 moles of H2S is produced.

Answer: The moles of hydrogen sulfide generated are 1.28 moles

Explanation:

We are given:

Moles of HCl = 2.56 moles

The chemical equation for the reaction of HCl and sodium sulfide follows:

\(Na_2S+2HCl\rightarrow 2NaCl+H_2S\)

By Stoichiometry of the reaction:

2 moles of HCl produces 1 mole of hydrogen sulfide gas

So, 2.56 moles of HCl will produce = \(\frac{1}{2}\times 2.56=1.28mol\) of hydrogen sulfide

Hence, the moles of hydrogen sulfide generated are 1.28 moles

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