If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?

Mg(s) + 2 HCl(aq) –> MgCl 2(aq) + H 2(g) [ H = 1.0, Mg = 24.0]

A. 0.54g
B. 0.70g
C. 1.08g
D. 1.40g

Correct Answer:

Option A – 0.54g

Explanation

24g of Mg will liberate 2g of H

: 6.5g of Mg will liberate Xg of H

= ( 6.5 X 2 ) / 24

= 0.5416g of Hygrogen ( H )