Question

Three containers of the same volume contain three different gases. The masses of the molecules are $m_1, m_2$ and $m_3$ and the number of molecules in their respective containers are $N_1, N_2$ and $N_3$. The gas pressure in the containers are $P_1, P_2$ and $P_3$ respectively. All the gases are now mixed and put in one of these containers. The pressure P of the mixture will be

• A. $P < (P_1 + P_2 + P_3)$
• B. $P = \frac{P_1 + P_2 + P_3}{3}$
• C. $P = P_1 + P_2 + P_3$
• D. $P > (P_1 + P_2 + P_3)$

Answer 1

Answer: (C)

$P = P_1 + P_2 + P_3$

Answer 2

According to Dalton?? law of partial pressures, we have $P = P_1 + P_2 + P_3$