Question

24. In which of the following chemical equations, the abbreviations
represent the correct states of the reactants and products involved
at reaction temperature?
(a) 2H2 (1) + O2 (1) > 2H2O(g)
(b) 2H2 (g) + O2 (1) > 2H2O
(1)
(c) 2H2 (g) + O2 (9) > 2H20 (1)
(d) 2H2 (9) +O2 (9) > 2H2O
(9)
I​

Answer 1

Explanation:

2H

2

+O

2

→2H

2

O

Molecular mass of H

2

=2 g/mol

Molecular mass of O

2

=32 g/mol

From the balanced chemical equation,

2×2=4 g of hydrogen requires 32 g of Oxygen to react completely