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Ideal gas law - Pressure on the walls of a propane tank

A cylindrical propane tank used for portable cooking stoves has an interior length of 16.5 cm and a diameter of 6.5 cm. The mass of the gas inside is 400g. Approximately how much pressure is exerted on the walls of the container when the temperature is 75^oF? Propane has a molecular mass of 44 g/mol.

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Solution is as follows:

P = nRT/V

We need to find each quantity in the right hand side.

n = mass/ molecular mass ...

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Solution is provided showing every step required.