How many moles are present in 4.00 g of ethanol (C2H5OH)?

• A. 1.00 mol
• B. 0.217 mol
• C. 0.0870 mol
• D. 0.500 mol

Answer: (C)

Verified step by step guidance

1. Identify the molecular formula of ethanol, which is C\_2H\_5OH, and determine the molar mass by summing the atomic masses of all atoms in the molecule.
2. Calculate the molar mass of ethanol by adding: (2 \times atomic mass of C) + (6 \times atomic mass of H) + (1 \times atomic mass of O). Use atomic masses approximately C = 12.01 g/mol, H = 1.008 g/mol, and O = 16.00 g/mol.
3. Use the formula to find moles: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\) where the mass is given as 4.00 g.
4. Substitute the values into the formula: \(\text{moles} = \frac{4.00\ \text{g}}{\text{molar mass of ethanol}}\).
5. Perform the division to find the number of moles of ethanol present in 4.00 g.