Calculate The Molar Mass Of: a) Ethyne b) Sulphur molecule c) Phosphorous molecule d) Nitric acid

a) Ethyne

Molar mass of C₂H₂ = 2 x atomic mass of C + 2 x atomic mass of H

= 2 x 12 + 2 x 1

= 26u

b) Sulphur molecule

Molar mass of S₈ = 8 x atomic mass of S

= 8 x 32

= 256u

c) Phophorous molecule

Molar mass of P₄ = 4 x atomic mass of P

= 4 x 31

= 124u

d) Nitric acid

Molar mass of HCl = atomic mass of Cl + atomic mass of H

= 35.5 + 1

= 36.5u