12. 12 g of Mg will react completel...
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12. 12 g of Mg will react completely with an acid to give (1) 1 mole of O2 (2) 5 mole of H (3) 1 equivalent of H2 (4) 2 equivalents of H,

JEE/Engineering Exams
Chemistry
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Moles of ( 12 mathrm{g} mathrm{Mg}: ) Moles = mass molar mass Molars mass magnesium ( =24 ) moles ( =12 / 24=0.5 ) moles. since ratio was ( 1: 1, ) then the moles of hydrogen produced will also be 0.5 moles
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