ANSWERS: 1
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So how many moles of Mg to start with 0.24/mwt = 0.24/55 = 0.004moles so the equation is Mn + 2 HCl = MnCl2 + H2 but essentailly one mole of Mn give one mole H2 so 0.004 moles of Mn gives o.oo4 moles of H2 0.004 x mwt of H2 (x2) = 0.008 grams H2
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