Which is the molar mass of BF3?10.81 g/mol29.81 g/mol48.81 g/mol67.81 g/mol

 The molar mass of BF3  is  67.81  g/mol   Explanation  Molar mass   is the  mass  of all  atoms  in a molecule  in gram per  mole.molar mass  of a molecule is calculated by adding  atomic mass  of constituent  atomuse the periodic table  to determine the atomic mass of each element in the  molecule.that is;          atomic mass of B = 10.81 g/mol          atomic  mass of F  = 19 g/mol since there 3 atoms  of F  in BF3 the  atomic massof F in BF3=  3 x19  =  57 g/moltotal molar  mass of BF3 = 10.81 g/mol + 57 g/mol = 67.81  g/mol