Question

Which is the molar mass of BF3?
10.81 g/mol
29.81 g/mol
48.81 g/mol
67.81 g/mol

Answer 1

 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  atom

• use 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/mol

• total molar  mass of BF3 = 10.81 g/mol + 57 g/mol = 67.81  g/mol

Answer 2

Answer:

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. Use the periodic table  to determine the atomic mass of each element in the  molecule.