How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dis...
Question
How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm3 of 6M HCl?
(Mg = 24, H = 1, Cl = 35.5)
Options
A)
1.2 g
B)
0.7 g
C)
0.5 g
D)
0.3 g
E)
0.12 g
Related Lesson: Concentration and Reaction Rates | Energy and Chemical Reactions
The correct answer is C.
Explanation:
Mg + 2HCl → MgCl2 + H2
6 molar contains 6 × 36.5 gms 1000 cc
= (6 × 36.5) ÷ 2gms in 500 cc
= 3 × 36.5
24 gms of mg will react with 2 × 36.5 HCl to liberate 2 gm of hydrogen
∴ 6 gms will liberate (6 × 2) ÷ (24 × 1) = 0.5 gm of H2
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Mg + 2HCl → MgCl2 + H2
6 molar contains 6 × 36.5 gms 1000 cc
= (6 × 36.5) ÷ 2gms in 500 cc
= 3 × 36.5
24 gms of mg will react with 2 × 36.5 HCl to liberate 2 gm of hydrogen
∴ 6 gms will liberate (6 × 2) ÷ (24 × 1) = 0.5 gm of H2