20 cm 3 of hydrogen gas are sparked with 20cm 3 of oxygen gas in an endimoeter at 373k (100 oC) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 oC) and passed over calcium chloride. The volume of the residual gas is
-
A.
40 cm 3 -
B.
20 cm 3 -
C.
30 cm 3 -
D.
10cm 3 -
E.
5cm 3
Correct Answer: Option D
Explanation
2H2 + O2 ——2H2O
2V 1V 2V
20cm3 20cm3 ——-
20cm3 10cm3 20cm3
Residual gas = 20cm3 – 10cm3 of 02 = 103