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A sample of argon gas at STP occupies 35 liters. Determine the number of moles of argon.

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Solution:

Note: The volume of one mole of an ideal gas at STP is 22.414 L.

[tex]\text{moles of Ar = 35 L Ar} × \frac{\text{1 mol Ar}}{\text{22.414 L Ar}}[/tex]

[tex]\boxed{\text{moles of Ar = 1.56 mol}}[/tex]

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