### Calculate by what factor the mass of propane has increased

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A typical propane tank that we use for barbeque initially contains a pressure of 10 psi. The pressure is low, so we take it to the local store to fill the tank with more propane. After filling,the pressure is 100 psi. Calculate by what factor the mass of propane has increased inside the tank? (Assume the temperature and volume are constant before and after filling the tank.)

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