Two flasks X and Y of volumes 250 mL and 300 mL respectively at the same temperature are connected by a stop cock of negligible volume. The flask X contains nitrogen gas at a pressure of 660 torr and the flask Y contains neon gas at a pressure of 825 torr. If the stop cock is opened to allow the two gases to mix, the partial pressure of neon gas and total pressure of the system will be

Options

A. 300 torr, 700 torr
B. 400 torr, 700 torr
C. 450 torr, 750 torr.
D. 300 torr, 750 torr

Answer

C

Explanation

`V_(x) + V_(y) = 250 + 300 = 550` mL
Since , the amount of nitrogen remains unchanged , therefore , partial pressure of `N_(2) = (p_(x) V_(x))/(V_(x) + V_(y)) , (660 xx 250)/(550) = 300` torr
Partial pressure of Ne = `(P_(y) V_(y))/(V_(x) + V_(y)) = (825 xx 300)/(550) = 450` torr
Therefore , total pressure = (300 + 450) = 750 torr