Two containers are filled with gases at ...

Two containers are filled with gases at the same temperature. In the container on the left is a gas of molar mass `2M`,volume `2V`, and numbher of moles `2n`. In the container on the right is a gas of molar mass `M`, volume `V`, and moles `n`. Which is most nearly the ratio of the pressure of the gas on the left to the pressure of the gas on the right?

`1:1`

`8:1`

`2:1`

`16:1`

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