Question

calculate the molar mass of NH3 and CaCO3

Answer 1

NH3- N +3H
= 14 + 3×1 ( mass of nitrogen is 14 and that of hydrogen is 1)
17
CaCO3- Ca+ C+3O
= 40 + 12+ 3×16
40+ 12+48
100
Hope it was helpful to u

Answer 2

Atomic mass of N=14, H=1, Ca=40,  C=12, O=16
               CaCO3 - 40+12+(3x16)

= 52 + 48

= 100 (whatever the unit)

NH3 -

14+3 = 17 units