one mol of H2S for every 2 mols of HCl
2.56/2 =1.28
That assumes of course that you put in plenty of Na2S
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?
2HCl + Na2S → H2S + 2NaCl
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