Question

calculate the molecular masses of H2, CO2, NH3 and CH3OH​

Answer 1

Answer:i) Molecular mass of H2= 2 x Atomic mass of H= 2 x 1

= 2 u

ii) Molecular mass of CO2= Atomic mass of C + 2 x Atomic mass of O

= 12 + 2 x 16

= 44 u

iii) Molecular mass of NH3= Atomic mass of N + 3 x Atomic mass of H

= 14 + 3 x 1

= 17 u

iv) Molecular mass of CH3OH= Atomic mass of N + 3 x Atomic mass of H

= 12+ 4 x 1+16

= 32 u

Explanation:

Answer 2

Answer:

The molecular mass of H₂= 2× atomic mass of H  

                                 = 2×1 = 2 u.

The molecular mass of O₂= 2× atomic mass of O

                                  = 2 × 16u =  32 u.

The molecular mass of CO₂=  atomic mass of C + 2 × atomic mass of O

                                    = 12 + 2×16

                                    = 12+ 32= 44 u.  

The molecular mass of NH₃= 14+ 3×1

                                    = 17 u.

molecular mass of CH₃OH= 12 + 3× 1+ 16 × 1

                                          = 32 u.

hope it helps...

Explanation: