21.0 liters of a monatomic gas at 8.080Ă—104 Pa and a temperature of 270.0 K are expanded by a factor of three at constant pressure, what is the new temperature of the gas?
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How many moles of gas are present?
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How much heat is put into to the gas?
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Without using the first law, calculate the change in internal energy? You can check your answer using the first law.