100 cm3 of oxygen is made to react with 50 cm 3 of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?
- 5 cm3
- 25 cm3
- 50 cm3
-
75 cm3
- 100 cm3
The correct answer is: D
Explanation
2H2 + O2 → 2H2O2V3 1V3 2V
50cm 100 —
50cm 25cm3 50cm3
Volume of gas left = (100 - 25)cm3 of O2 = 75 cm3 of O2