Final answer:
In 0.251 g of N₂O, there are 0.0114 moles of nitrogen. This was calculated by first determining the molar mass of N₂O and then converting the given mass of N₂O to moles, which was then multiplied by 2 to account for the two nitrogen atoms per molecule of N₂O.
Step-by-step explanation:
To calculate the number of moles of nitrogen (N) in 0.251 g of N₂O, you first need to know the molar mass of N₂O. Since nitrogen has a molar mass of 14 g/mol and oxygen has a molar mass of 16 g/mol, the formula N₂O has a total molar mass of (2 × 14) + 16 = 44 g/mol. Now, you can calculate the number of moles of N₂O in 0.251 g:
0.251 g N₂O × (1 mol N₂O / 44 g N₂O) = 0.00570 mol N₂O
However, each molecule of N₂O contains two nitrogen atoms. Therefore, to find the number of moles of nitrogen atoms, you would multiply the moles of N₂O by 2:
0.00570 mol N₂O × 2 = 0.0114 mol N
Thus, there are 0.0114 moles of nitrogen in 0.251 g of N₂O.