Answer:
67.81 g/mol
Explanation:
The molar mass is the sum of all atomic masses in the compound. For this compound the atomic masses are:
B = 10.81 g/mol
F = 19.00 g/mol
As we have 1 atom of B and 3 atoms of F, the formula to calculate the molar mass is:
BF3 Molar mass = 1(B atomic mass) + 3(F atomic mass)
BF3 Molar mass = 1(10.81 g/mol) + 3(19.00 g/mol) = 67.81 g/mol
So, the molar mass of BF3 is 67.81 g/mol
