Which is the molar mass of BF3? 10. 81 g/mol 29. 81 g/mol 48. 81 g/mol 67. 81 g/mol.

The answer is 67.81 g/mol.

Explanation:
1. Determine the atomic weight of B and F
2. B has an atomic weight of 10.811 g/mol and F has an atomic wight of 19.00 g/mol
3. From the chemical formula, we have 1 boron atom, so the atomic mass would just be 10.811 g/mol
4. Next, you have 3 fluorine atoms, so you would multiply the atomic mass of F by 3 to obtain an atomic weight of 57.00 g/mol
5. Now you want to add the mass of each atom together to obtain the molar mass of the entire compound:
10.811 g/mol + 57.00 g/mol = 67.81 g/mol

It would have to be c or d