Chemical Thermodynamics Question 309
Question: The enthalpy of combustion of methane at $ 25^{o}C $ is $ 890,kJ $ . The heat liberated when $ 3.2,g $ of methane is burnt in air is [KCET 2004]
Options:
A) $ 445,kJ $
B) $ 278,kJ $
C) $ -890,kJ $
D) $ 178,kJ $
Show Answer
Answer:
Correct Answer: D
Solution:
1 mole (i.e.,) $ 16gm $ of methane on combustion liberate $ 890,kJ $
$ \therefore $ $ 3.2,gm $ will liberate $ =\frac{890\times 3.2}{16} $
$ =178,KJ $
