Question

The reaction of calcium with water is represented by the equation Ca + 2H20 -- Ca(OH)2 + H2 The volume of hydrogen measured at STP that would be liberated when 8g calcium completely reacts with water is (A)4480 cm3 (B)2240 cm3 (C)1120 cm3 (D)0.4 cm3

Answer 1

Answer:

Correct option is

D

4480cm

3

Here, calculation is done, using the balanced chemical equation as follows:

Ca+2H

2

O→Ca(OH)

2

+H

2

According to the stoichiometry of reaction, 40 gm of Ca on complete reaction with water liberates =2 gm H

2

∴8 gm of Ca, on complete reaction with water will liberates =

40

2

×8