Question

ii)
The percentage of oxygen in air by weight:
(a) 78%
(b) 23%
(c) 21%
(d) None
​

Answer 1

Answer:

c) 21%

PLS MARK ME THE BRAINLIEST

Answer 2

Heya mate! ▪️◾◼️

21 %..According to the options..

But..

20.95% is the answer..