Final answer:
To find the number of moles in 4.50 g of ethanol, we divide the mass of ethanol by its molar mass, which results in approximately 0.098 moles of ethanol.
Step-by-step explanation:
To calculate the number of moles in 4.50 g of ethanol (CH₃CH₂OH), we first need to determine the molar mass of ethanol. The molar mass of ethanol is 46.07 g/mol. We can use the formula:
Number of moles = mass (g) / molar mass (g/mol)
Substituting the given values into the formula, we get:
Number of moles = 4.50 g / 46.07 g/mol
After performing the division, we find the number of moles of ethanol to be approximately 0.098 mol.