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For 9.13 in the 6th edition, it says "During the test of an internal combustion engine, 3.00 L of nitrogen gas at 18.5 degrees C was compressed suddenly and irreversibly to 0.5 L by driving in a piston. In the process, the temperature of the gas increased to 28.1 degrees C. Assume ideal behavior. What is the change in entropy of the gas?" I know I'm supposed to use delta S=nR(ln(v2/v1)), but moles aren't given. Does "assume ideal behavior" mean 1.00 mol?
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