Two gases A and B have molecular weight 60 and 45. 0.6 g of A and 0.9 g of B are mixed in a closed vessel. Total pressure is 720 mm. The partial pressure of A is

Options

A. 240 mm
B. 480 mm
C. 600 mm
D. None of these

Answer

A

Explanation

Molecular weight of `A = 60`
Molecular weight of B = 45
Weight of A = 0.6 g
`thereore `Number moles of `A = (0.6)/(60) = 0.01`
Weight of B = 0.9 B
`therefore` Number of moles of `B = (0.9)/(45) = 0.02`
Total number of moles `= 0.01 + 0.02 = 0.03`
Total pressure = 720 mm
` therefore` Partial pressure of `A = (0.1)/(0.3) xx 720 = 240 mm`