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physics....properties of matter....ASAP.pls

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Helium gas occupies a volume of 0.04m^3 at a pressure of 2*10^5 N/m^2 and a temperature of 300K,calculate:
1.) the mass of helium
2.)the root mean square speed of its molecule
3.)the root mean square speed at 432K when the gas is heated at constant pressure to this temperature

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