Question

Two seperate bulbs contain ideal gases A and B respectively. The density of gas A is twice that of gas B and the molar mass of gas A is half that of gas B. If the two gases are at the same temperature, the ratio of the pressure of A to that of B is:

Answer 1

$P=\frac{dRT}{M}$ (At the same temperature)
$\frac{P_A}{P_B}=\frac{d_A}{M_A}\times \frac{M_B}{d_B}=\frac{d_A}{d_B}\times \frac{M_B}{M_A}=2\times 2=4$