Question

Calculate the molar mass of C7H12.
Responses

108 g/mol
108 g/mol

67 g/mol
67 g/mol

96 g/mol
96 g/mol

342 g/mol

Answer 1

To calculate the molar mass of C7H12, we need to sum the molar masses of carbon (C) and hydrogen (H).

1. The molar mass of carbon (C) is approximately 12.01 g/mol.
2. The molar mass of hydrogen (H) is approximately 1.01 g/mol.

Now, calculate the total molar mass:

- For carbon: \( 7 \text{ C} \times 12.01 \text{ g/mol} = 84.07 \text{ g/mol} \)
- For hydrogen: \( 12 \text{ H} \times 1.01 \text{ g/mol} = 12.12 \text{ g/mol} \)

Now, add these together:

\[
84.07 \text{ g/mol} + 12.12 \text{ g/mol} = 96.19 \text{ g/mol}
\]

Rounding this to two significant figures gives approximately 96 g/mol.

Therefore, the correct answer is:

96 g/mol