The molar mass of nitrogen (N2) is 28.02 g/mol. What is the mass, in grams, of 4.60 mol of N2?

Use mass = amount in moles × molar mass. For 4.60 mol of N₂, the mass is 4.60 mol × 28.02 g/mol = 128.892 g. Since 4.60 has three significant figures, round the result to 129 grams, choice D.

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