What is relative abundance of helium in atmosphere​

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if you're asking what comes out, it's steam.

the correct answer is:

a. formation of precipitation

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.