The mass of one mole of nitrogen gas is 28.0 g.

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Consider the statement about the molar mass of nitrogen gas. 
Option 1: True. The chemical formula for nitrogen gas is N2, and the atomic mass of a single nitrogen atom is about 14.01 g/mol. Doubling that for the diatomic molecule gives a molar mass of roughly 28.02 g/mol, which is commonly rounded to 28.0 g/mol when appropriate significant figures are used. Therefore, stating that the mass of one mole of nitrogen gas is 28.0 g is consistent with standard rounding conventions. 
Option 2: False. If one insisted that the molar mass must be exactly 28.02 g/mol with no rounding, this would be technically precise, but in typical chemistry contexts molar masses are given to a reasonable number of significant figures. A value of 28.0 g/mol is an acceptable rounded representation, not an incorrect one. However, if the expectation were an exact 28.02 g/mol without rounding, then 28.0 g would be considered an approximation, not an exact value. 
In summary, the statement aligns with common rounding practices for the molar mass of N2, making True the suitable choice under standard educational conventions. If precision to two decimals were mandated, one might expect 28.02 g/mol; with typical sig figs, 28.0 g/mol is acceptable.

The mass of one mole of nitrogen gas is 28.0 g.

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