why do gasses with higher molar mass have a higher concentration in solution at a fixed temp and pressure?

According to https://chemistry.stackexchange.com/questions/40224/gas-pressure-and-molecular-mass

The ideal gas equation (or the van der Waals equation, for this matter) states that holding volume and temperature constant, increasing the number of moles of particles in the container will increase the total pressure exerted by the gas mixture.

Explanation:

I hope it helps!

there is none because earth is stationary and flat.