How many moles are in 2.5 g of N2?

Nitrogen gas, N₂, has a molar mass of about 28 g/mol (2 × 14 g/mol). Divide the sample mass by the molar mass: 2.5 g ÷ 28 g/mol ≈ 0.089 moles, so the correct choice is 0.089 moles.

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