Question

calculate the molecules masses​

Answer 1

Explanation:

check NCERT SOLUTIONS

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Answer 2

Answer:

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

= 2 u

ii) Molecular mass of O2= 2 x Atomic mass of O

= 2 x 16

= 32 u

iii) Molecular mass of Cl2= 2 x Atomic mass of Cl

= 2 x 35.5

= 71 u

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

= 12 + 2 x 16

= 44 u

v) Molecular mass of CH4= Atomic mass of C + 4 x Atomic mass of H

= 12 + 4 x 1

= 16 u

vi) Molecular mass of C2H6= 2 x Atomic mass of C + 6 x Atomic mass of H

= 2 x 12 + 6 x 1

= 30 u

vii) Molecular mass of C2H4= 2 x Atomic mass of C + 4 x Atomic mass of H

= 2 x 12 + 4 x 1

= 28 u

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

= 14 + 3 x 1

= 17 u

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

= 12+ 4 x 1+16

= 32 u

2. Formula unit mass of ZnO=(Atomic mass of Zn)+(Atomic mass of O)

                                            =(65+16)u =81u

Formula unit mass of Na2

​  

O=(2×23)+16 =62u

Formula unit mass of K2CO3

​  

=(2×39)+12+(3×16) =138u

Explanation:

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