Question

A partially inflated balloon contains 500cm3 of helium at 27 degree centrigrate and 1atm pressure. What is the volume of helium at altitude of 1800ft where the pressure is 0.5 atm and temperature -30degree centigrate?.
What is the average velocity of the molecules in a sample of oxygen at 100 degree. Hint the mass of an oxygen molecule is 5.3*10^-26kg?

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