Calculate the molecular masses of H2, O2, Cl2, CO2, CH4, C2H6, C2H4, NH3, CH3OH.

Q.:- Calculate the molecular masses of H2, O2, Cl2, CO2, CH4, C2H6, C2H4, NH3, CH3OH.

 

Answer:-

Molecular mass of  H2 = 2 X atomic mass of  H = 2 X 1u = 2u

Molecular mass of  O2 = 2 Xatomic mass of  O = 2 X 16u = 32u

Molecular mass of  Cl2 = 2 X atomic mass of Cl = 2 X 35.5u = 71u

Molecular mass of  CO2 = atomic mass of  C + 2 X atomic mass of O

= 12+ (2+16) = (12 + 32)u = 44u

Molecular mass of CH4 =  atomic mass of  C+ 4 X atomic mass of H

= 12+ (4X1)u = (12 + 4)u = 16u

 

Molecular mass of  C2H6 = 2 X atomic mass of  C + 6 X atomic mass of H

= (2 X 12 + 6 X 1)u = (24 + 6)u  =  30u

Molecular mass of  C2H4 = 2 X atomic mass of  C+ 4 X atomic mass of H

= (2 X 12 + 4 X 1)u = (24 + 4)u  =  28u

Molecular mass of  NH3 = atomic mass of  N + 3 X atomic mass of H

= (14 + 3 X 1)u = (14 + 3)u = 17u

Molecular mass of  CH3OH = atomic mass of C + 3 x atomic mass of H + atomic mass of O

+ atomic mass of H

= (12 + 3 X 1 + 16 + 1)u = (12 + 3 + 17)u = 32u