A) \[-1357.9\text{ }kJ\]
B) \[-1275.9kJ\]
C) \[-1572kJ\]
D) \[+1572kJ\]
Correct Answer: C
Solution :
Heat of formation is the amount of heat absorbed or evolved when 1 mole of substance is formed from its elements. Given, mass of \[C{{O}_{2}}=0.176\text{ }kg=176\text{ }g\] Molecular weight of \[C{{O}_{3}}=1mole\] of \[C{{O}_{2}}=44g\] \[\underset{12g}{\mathop{C}}\,+\underset{2\times 16g}{\mathop{{{O}_{2}}}}\,\xrightarrow{{}}\underset{44g}{\mathop{C{{O}_{2}}}}\,-393kJ\] \[\therefore \]Heat evolved when 44 g of \[C{{O}_{2}}\] is produced \[=-393\text{ }kJ\] \[\therefore \] Heat evolved when 176 g of \[C{{O}_{2}}\] is produced \[=-\frac{393}{44}\times 176\] \[=-1572kJ\]
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