Final answer:
The given chemical equation is balanced, and there are 2.446 moles of nitrogen present.
Step-by-step explanation:
The given chemical equation is N2 + 3H2 → 2NH3. To verify if the equation is balanced, we need to check if the number of atoms on both sides of the equation is the same. On the left side, we have 2 nitrogen atoms and 6 hydrogen atoms. On the right side, we also have 2 nitrogen atoms and 6 hydrogen atoms, which means the equation is balanced.
To find the number of moles of nitrogen present, we need to convert the given mass of nitrogen to moles. The molar mass of nitrogen (N2) is 28.02 g/mol. Using the given mass of nitrogen (68.5 grams) and the molar mass, we can calculate:
Number of moles of nitrogen = Mass of nitrogen / Molar mass of nitrogen = 68.5 g / 28.02 g/mol = 2.446 mol
Therefore, the correct answer is option a) 2.44.