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Chemistry
Which of the following reactions corresponds to the definition of enthalpy of formation ?
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Q. Which of the following reactions corresponds to the definition of enthalpy of formation ?
UP CPMT
UP CPMT 2010
A
$\ce{C_{(g)} +O2_{(g)} -> CO2_{(g)}}$
B
$\ce{C_{(s)} +O2_{(l)} -> CO2_{(g)}}$
C
$\ce{C_{(s)} +O2_{(g)} -> CO2_{(g)}}$
D
$\ce{C_{(l)} +O2_{(s)} -> CO2_{(g)}}$
Solution:
Enthalpy of formation is the heat change when $1$ mole of a substance is formed from its constituent elements in gaseous state