Chemical Thermodynamics Question 306

Question: If the heat of formation of $ CO_2 $ is $ -393,kJ $ . The amount of heat evolved in the formation of 0.156 kg of $ CO_2 $ is [MH CET 2004]

Options:

A) $ -1357.9kJ $

B) $ -1275.9,kJ $

C) $ -1572.0,kJ $

D) $ -1165.5,kJ $

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Answer:

Correct Answer: C

Solution:

Heat of formation of a substance is the heat exchanged when one mole of that substance is formed by its constituent elements. $ \because $ Heat evolved when 1 mole $ (44g),CO_2 $ is formed $ =393,kJ $

$ \therefore $ Heat evolved when $ 0.156,Kg,(156g) $ is formed $ =\frac{393\times 156}{44} $

$ \therefore $ $ \Delta H $ for the process $ =1572,kJ $

$ =-1572.0,kJ $



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