What is the molar mass of this phenol (C₂H₅OH)? The atomic masses of C, H and O are 12.0,

Question

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.