A mixture of `N_2` and Ar gases in a cylinder contains 7g of `N_2` & 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27bar, the partial pressure of `N_2` is:

Options

A. 9 bar
B. 12 bar
C. 15 bar
D. 18 bar

Answer

C

Explanation

`n_(N_2) = 7/28 = 1/4 = 0.25`
`n_(Ar) = 8/40 = 1/5 = 0.20`
Now, Applying Dalton.s law of partial pressure,
`P_(N_2) = (X_(N_2) ) P_("total")`
`= (0.25)/(0.45) xx 27` bar
` = 5/9 xx 27 = 15` bar .