1. Tardigrade
  2. Question
  3. Chemistry
  4. The enthalpy of combustion of propane, graphite and dihydrogen at 298 K are: 2220.0 kJ mol -1,-393.5 kJ mol -1 and -285.8 kJ mol -1 respectively. The magnitude enthalpy of formation of propane ( C 3 H 8) is........kJ mol -1. (Nearest integer)

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Q. The enthalpy of combustion of propane, graphite and dihydrogen at $298\, K$ are: $2220.0 \,kJ \,mol ^{-1},-393.5\, kJ \,mol ^{-1}$ and $-285.8$ $kJ \,mol ^{-1}$ respectively. The magnitude enthalpy of formation of propane $\left( C _3 H _8\right)$ is........$kJ \,mol ^{-1}$. (Nearest integer)

JEE MainJEE Main 2022Thermodynamics

Solution:

$ 3 C _{( gr )}+4 H _{2( g )} \rightarrow C _3 H _{8( g )} $
$ =-103.7 \,kJ\, mol ^{-1}$