Question

Air contains 23% oxygen and 77% nitrogen by weight. The percentage of O2 by volume is (1) 28.1 (2) 20.7 (3) 21.8 (4) 23.0

Answer 1

23g O2 Has 32.2 L Volume ,77g N2 Has 123.2 Volume.Now By Calculating The Percentage Of 32.2 L O2 In (123.2+32.2) L Gas We Get 20.7% O2 By Volume