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what mass of a divalent metal M (atomic mass = 40) would react with excess...

what mass of a divalent metal M (atomic mass = 40) would react with excess hydrochloric acid to liberate 224cm³ of dry hydrogen gas measured at S.T.P? [ G.M.V=22.4dm³]?
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Asked by Thelma on 15th March, 2020
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