A gas sample that has a mass of 7.02g occupies 310cm cubed at 54.3 degrees celcius and a pressure of 87.4kPa. Calcuate the gas' density at STP (273 K and 101.3kPa)

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I am using PV=nRT to solve for moles, and I get .0099585404 moles of gas sample.I then use the new STP conditions with my number of moles to solve for V and obtain 223 cc.