## To calculate the molar mass of caffeine, we need to determine the atomic masses of each element in the compound and sum them up.

The atomic masses are as follows:

- Carbon (C) = 12.01 g/mol

- Hydrogen (H) = 1.01 g/mol

- Nitrogen (N) = 14.01 g/mol

- Oxygen (O) = 16.00 g/mol

Now, we can calculate the molar mass of caffeine:

(1 * C) + (10 * H) + (1 * N) + (4 * O)

= (1 * 12.01 g/mol) + (10 * 1.01 g/mol) + (1 * 14.01 g/mol) + (4 * 16.00 g/mol)

= 12.01 g/mol + 10.10 g/mol + 14.01 g/mol + 64.00 g/mol

= 100.12 g/mol + 78.01 g/mol

= 178.13 g/mol

Therefore, the molar mass of caffeine is approximately 178 g/mol, which is closest to the option provided.