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A 2.74 L sample of krypton gas contains 0.351 mol of krypton. How many additional moles of krypton must be added to this sample to

A 2.74 L sample of krypton gas contains 0.351 mol of krypton. How many additional moles of krypton must be added to this sample to expand its volume to 12.5 L? Assume temperature and pressure remain constant.

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