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A 64 cm long cylindrical tube has a radius 29.3cm that contains helium. It is at...

A 64 cm long cylindrical tube has a radius 29.3cm that contains helium. It is at 512.88oC. It's pressure gauge reads 64.5 PSI.
a) How many helium atoms are in the cylinder?
b) What is the mass of the helium? in Kg
c) What is the helium number density? in atoms/m3
d) What is the gas's density (mass/volume)?in Kg/m3

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