Question

3.
Which of the following molecule has highest
percentage of oxygen by mass? [NCERT Pg. 18]
(1) H2O
(2) CO2
(3) CaCO3
(4) C2H5OH​

Answer 1

Answer:

(3)Caco3

Explanation:

Oxygen atomic mass=16 u

So,(16×3)u=48u.

Answer 2

Answer:

Answer (1)

H,0(88.9% 0), CO.(72.7% O), CaCO.(48% 0}, C,H.OH(34.8% O).

Explanation: