Question

In a flask of volume V litres, $0.2$mol of oxygen, $0.4$mol of nitrogen, 0.1 mol of ammonia and $0.3$mol of helium are enclosed at $27^{0}C$. If the total pressure exerted by these non-reacting gases is one atmosphere, the partial pressure exerted by nitrogen is.

• A. $0.1$atmosphere
• B. $0.2$ atmosphere
• C. $0.3$ atmosphere
• D. $0.4$ atmosphere

Answer 1

Answer: (D)

$0.4$ atmosphere

Answer 2

: $P_{N2} = \frac{0.4}{0.2 + 0.4 + 0.1 + 0.3} \times 1 = 0.4$atm

($\therefore$partial pressure = mole fraction × total pressure)