Calculate the number of moles in 7.5 g of Ar, and the volume that it would occupy at STP. A)0.19 mol, 0.0085 L B)0.19 mol, 4.2 L C)3.0 x 10² mol, 13 L D)3.0 x 10² mol, 6.7 x 10³ L E)1.0 mol, 22 L

Question

Quizplus · Accepted Answer

The molar mass of Ar (argon) is approximately 39.95 g/mol. To find the number of moles, divide the mass by the molar mass: 7.5 g / 39.95 g/mol ≈ 0.19 mol. At STP, 1 mole of any gas occupies 22.4 L, so 0.19 mol would occupy 0.19 mol * 22.4 L/mol ≈ 4.2 L.

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