b) How many grams of hydrogen are formed when 1.20 g of magnesium are added to water?

Answer 1

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Mg + 2 H2O --> Mg(OH)2 + H2

1.20 g Mg / 24.3 g/mol X (1 mol H2/1 mol Mg) X 2.016 g/mol H2 = 0.0996 g H2