Answer:
1.43 moles N₂
Step-by-step explanation:
To determine the moles of nitrogen gas (N₂), you need to multiply the given value by the molar mass. The molar mass is a ratio comparing the mass (g) of nitrogen gas per 1 mole. It is important to arrange this ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 3 sig figs to match the given value.
Molar Mass (N₂): 2(14.007 g/mol)
Molar Mass (N₂): 28.014 g/mol
40.0 grams N₂ 1 mole
------------------------- x ------------------------ = 1.43 moles N₂
28.014 grams