Question

12. What is the proportion of elements by mass present in the following compounds ? (a) H2o (c) Cao (b) CO2 (d) N02​

Answer 1

Explanation:

Compounds  Elements   Proportion of elements

(a) H2O H : O  1 : 8 

(b)CO2  C : O  3 : 8 

(c)CaO  Ca : O 5 : 2 

(d)NO2   N : O 7 : 16

Answer 2

Answer:

Compounds/Elements./Proportion of elements

(a) H2o. H:O 1:8

b)Co2. Ca:O. 3:8

c) CaO. C:O. 5:2

d) NO2. N:O. 7:16

please mark me as brainlist