chemistry

if a sample of alloy containing magnesium and metal that doesn't react wtih hydrochloric acid are reacted, how much heat would be evolved from a 5 gram sample that is 30% magnesium?

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asked by mike
  1. Mg + 2HCl ==> MgCl2 + H2
    Look up delta Hf for MgCl2 and HCl. Then
    delta H rxn = (DHf MgCl2) - (2*DHf HCl).
    heat evolved = DHrxn x (5*0.30/24.3

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