Question

Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel. The wt. of A is 0.50 g and that of B is 0.2 g. The total pressure of the mixture is 750 mm. The partial pressure of the gases B is ______ mm Hg.

Options

• 25.690

• 259.84

• 630.03

• 560.12

Answer 1

Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel. The wt. of A is 0.50 g and that of B is 0.2 g. The total pressure of the mixture is 750 mm. The partial pressure of the gases B is 259.84 mm Hg.

Explanation:

Given W_A = 0.50 g, M_A = 60, W_B = 0.20 g, M_B = 45, P = 750 mm Hg

`therefore "n"_"A" = 0.50/60` = 0.0083

`therefore "n"_"B" 0.20/45` = 0.0044

∴ n_A + n_B = 0.0083 + 0.0044 = 0.0127

Partial pressure:

P_B = `0.0044/0.0127 xx 750`

P_B = 259.84 mm Hg