The density of a gas of relative molecular mass 28 at a certain temperature is 0.90 kgm-3.
The root mean square speed of the gas molecules at that temperature is 602 ms-1. Assuming2
that the rate of diffusion of a gas is inversely proportional to the square root of its density,
calculate the density of the gas standard temperature and pressure if its root mean square
speed at is 490 ms-1
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