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A gas sample containing 1.42 moles at 23°C exerts a pressure of 450. torr. Some gas...

A gas sample containing 1.42 moles at 23°C exerts a pressure of 450. torr. Some gas is added to the same container and the temperature is increased to 40.°C. If the pressure increases to 800. torr, how many moles of gas were added to the container? Assume a constant-volume container.

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