1. Tardigrade
  2. Question
  3. Chemistry
  4. If heat of formation of C3H8,CO2 and H2O are -38.2,-94.1 and -48.2kcal respectively. Then calculate heat of combustion of propane:-

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. If heat of formation of $C_{3}H_{8},CO_{2}$ and $H_{2}O$ are $-38.2,-94.1$ and $-48.2kcal$ respectively. Then calculate heat of combustion of propane:-

NTA AbhyasNTA Abhyas 2020

Solution:

$C_{3}H_{8}+5O_{2} \rightarrow 3CO_{2}+4H_{2}O$
$ΔH=\left(ΣΔ\right)_{f}H\left(\right.P\left.\right)-\left(ΣΔ\right)_{f}H\left(\right.R\left.\right)$
$ΔH=3\left(\right.-94.1\left.\right)+4\left(\right.-48.2\left.\right)+38.2$
$ΔH=-282.3-192.8+38.2$
$ΔH=-436.9Kcal$