Final answer:
To find the number of moles of N2O4 in 76.3 g, we divide the mass by the molar mass of N2O4, resulting in approximately 0.829 moles.
Step-by-step explanation:
To determine the number of moles of N2O4 in 76.3 g of N2O4, we need to use the molar mass of N2O4 which is 92.02 g/mol. The molar mass gives the mass of one mole of a substance. We can use the formula:
moles = mass / molar mass
In this case, moles = 76.3 g / 92.02 g/mol = 0.829 mol. Therefore, there are approximately 0.829 moles of N2O4 in 76.3 g of N2O4.