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?
-
A.
5 cm3 -
B.
25 cm3 -
C.
50 cm3 -
D.
75 cm3 -
E.
100 cm3
Correct Answer: Option D
Explanation
2H2 + O2 → 2H2O
2V3 1V3 2V
50cm 100 —
50cm 25cm3 50cm3
Volume of gas left = (100 – 25)cm3 of O2 = 75 cm3 of O2