MCQ

Limiting Reagent and Yield

By Sakshi Goel | 19 May'20 | 985 Views

MCQ

Problem:
12 g of Mg will react with an acid to give
(a) 1 mole of O₂
(b) 1 mole of H₂
(c) 2 moles of H₂
(d) (1/2) mole of H₂

Solution:

Molar mass of Mg = 24 g/mol
mass of Mg = 12 g
Moles of Mg = 12/24 = 0.5 mol
The reaction of Mg with acid is
$Mg + 2 H^{+} â†’ {Mg}^{2 +} + H_{2}$
1 mole of Mg gives 1 mole of H₂.
So, 0.5 mol of Mg will give 0.5 mole of H₂.
Option (d) is correct.

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