Calculate the molar mass of the following compounds:
(a)hydrogen fluoride, hf
(b) ammonia, nh3
(c)nitric acid,hno3
(d)silver sulfate, ag2so4
(e)boric acid,b(oh)3

Explanation:

Molar mass

The mass present in one mole of a specific species .

The molar mass of a compound , can easily be calculated as the sum of the all the individual atom multiplied by the number of total atoms .

(a) )hydrogen fluoride, HF

Since ,

Molar mass of of the atoms are -

Hydrogen , H = 1 g/mol

Fluorine, F = 19 g/mol.

Molar mass of HF = ( 1 g/mol ) + ( 19 g/mol ) = 20 g/mol.

(b) ammonia, NH₃

Molar mass of of the atoms are -

nitrogen, N = 14 g/mol

and Hydrogen , H = 1 g/mol

Molar mass of NH₃ = 14 + ( 3 x 1 ) g/mol = 17 g/mol.

(c) nitric acid , HNO₃

Molar mass of of the atoms are -

oxygen , O = 16 g/mol.

Hydrogen , H = 1 g/mol

nitrogen, N = 14 g/mol

Molar mass of HNO₃ = (1 g/mol ) + ( 14 g /mol) + ( 3 x 16 ) = 63 g/mol.

(d)Silver sulfate, Ag₂SO₄

Molar mass of of the atoms are -

silver, Ag = 108 g/mol

sulfur, S = 32 g/mol.

oxygen , O = 16 g/mol.

molar mass of Ag₂SO₄ = ( 2 x 108 g/mol  ) + ( 32 g /mol )+ (4 x16 g/mol )

=312 g/mol.

(e )boric acid , B(OH)₃

Molar mass of of the atoms are -

boron , B = 11 g/mol  

 oxygen , O = 16 g/mol.

Hydrogen , H = 1 g/mol

Molar mass of  B(OH)₃ = ( 11 ) + ( 3x16 ) + ( 3 x 1 ) = 62 g/mol.