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a monoatomic ideal gas originally occupies a volume of 3.0 L and then expands to a...

a monoatomic ideal gas originally occupies a volume of 3.0 L and then expands to a new volume of 3.0 L and then expands to a new volume of 24.0 L if the final pressure of the gas is 1 atm and the change in entropy of the gas during expansion is zero, what must have been the inital pressure of the gas (Hint: it may help to determine the ratio of final to inital temperature Tf/Ti)

Please any help is appreciated. Thank you

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