Question

what is the ratio of mass of combining elements in H2O CO2 and NH3​

Answer 1

H2O

H mass=1 g

But for H2=2 g

O mass =16 g

H2:O=2:16

=1:8

H2O mass=18g

CO2

C mass=12 g

O mass=16 g

But for O2=16×2=32g

C:O2=12:32=3:8

CO2 mass=44g

NH3

N mass=14 g

H mass=1 g

But for H3=3×1=3g

N:H3=14:3

NH3 mass=17 g .

$\mathfrak \purple{hope \: you \: understood}$