A 0.5 dm³ flask contains gas A and a 1 dm³ flask contains gas B at the same temperature.
If the density of A=3 g.dm⁻³, that of B=1.5 g.dm⁻³ and the molar mass of A=12 B, the ratio of pressures exerted by the gases is:
A. PA/PB=2
B. PA/PB=1
C. PA/PB=4
D. PA/PB=3