6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be ______________ gm?
Correct answer: A. 0.5
- A. 0.5
- B. 1
- C. 3
- D. 5
Explanation
Six grams of magnesium represents 6/24 = 0.25 mol, and the reaction produces one mole of H2 per mole of Mg. Thus hydrogen formed is 0.25 × 2 = 0.5 g.
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