Question

What is the molar mass of this phenol (C₂H₅OH)? The atomic masses of C, H and O are 12.0,
1.01 and 16.00 amu respectively. (1 point)
94.1 g/mole
29.0 g/mole
46.1 g/mole
100 g/mol

Answer 1

To calculate the molar mass of phenol (C₂H₅OH), we need to sum the molar masses of all the atoms in the molecular formula.

The molecular formula C₂H₅OH contains:
- 2 carbon (C) atoms
- 6 hydrogen (H) atoms (5 from C₂H₅ and 1 from OH)
- 1 oxygen (O) atom

Now, we will use the atomic masses provided:
- Carbon (C): 12.0 amu
- Hydrogen (H): 1.01 amu
- Oxygen (O): 16.00 amu

Calculating the molar mass:

1. For carbon:
\( 2 \text{ C} = 2 \times 12.0 \, \text{amu} = 24.0 \, \text{amu} \)

2. For hydrogen:
\( 6 \text{ H} = 6 \times 1.01 \, \text{amu} = 6.06 \, \text{amu} \)

3. For oxygen:
\( 1 \text{ O} = 1 \times 16.00 \, \text{amu} = 16.00 \, \text{amu} \)

Now, adding them together:
\[
\text{Total molar mass} = 24.0 + 6.06 + 16.00 = 46.06 \, \text{amu}
\]

Therefore, the molar mass of phenol (C₂H₅OH) is approximately **46.1 g/mole** (rounded).

So, the correct answer is:
**46.1 g/mole**.