Physics · KINETIC THEORY

Two ideal gases \( A \) and \( B \) have molar masses in the ratio \( M_A : M_B = 1 : 2 \). A mixture is prepared containing equal masses of both gases at a temperature \( T \). If the total pressure of the mixture is \( P \), what is the partial pressure of gas \( A \)?

1. A
   \( \frac{3}{4} P \)
2. B
   \( \frac{1}{3} P \)
3. C
   \( \frac{1}{2} P \)
4. D
   \( \frac{2}{3} P \)