Chemical Thermodynamics Question 230

Question: In the combustion of $ 2.0,gm $ of methane $ 25,kcal $ heat is liberated, heat of combustion of methane would be [MP PMT 1994]

Options:

A) $ 100,kcal $

B) $ 200,kcal $

C) $ 300,kcal $

D) $ 400,kcal $

Show Answer

Answer:

Correct Answer: B

Solution:

$ CH_4+2O_2\to CO_2+2H_2O $ Molecular weight of $ CH_4=12+4=16 $

$ \therefore $ On the combustion of 2.0gm of methane = 25.0 kcal

$ \therefore $ On the combustion of $ 16.0gm=\frac{25\times 16}{2}=200,kcal. $



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