Under similar conditions, 390cm^# of gas A of molar mass M_A and 130cm^3 of gas B of molar mass M_B diffuesed out through a porous container i nthe time ratio of 2:1. The ratio of M_A to M_B is

Under similar conditions, 390cm^# of gas A of molar mass M_A and 130cm

1.	Under similar conditions, 390cm^# of gas A of molar mass M_A and 130cm^3 of gas B of molar mass M_B diffuesed out through a porous container i nthe time ratio of 2:1. The ratio of M_A to M_B is
Answer» `3 :8` `8 :3` `4 :9` `9 :4` ANSWER :C