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What mass of manganese(II) chloride must react with sulfuric acid to release 50.0 mL of hydrogen...

What mass of manganese(II) chloride must react with sulfuric acid to release 50.0 mL of hydrogen chloride gas at STP?
MnCl2(s)+H2SO4(aq)→MnSO4(aq)+2HCl(g)

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