First slide

Enthalpy of Combustion

Question

Heat of combustion of C₂H₄ is -337 K.Cal. If 5.6 lit O₂ is used at STP in the combustion, heat liberated is ...... K.Cal

Moderate

Solution

$\large {C_2}{H_{{4_{(g)}}}}\; + \;3{O_{{2_{(g)}}}}\; \to \;2C{O_{{2_{(g)}}}}\; + \;2{H_2}{O_{(l)}}\$

When 3x22.4 lit of O₂ used ----337 Kcal
5.6 lit of O₂ used -----?

$\large \frac{{5.6}}{{3 \times 22.4}} \times 337\$

$\large \ = \frac{{337}}{{12}}\; = \;28.08K.cal\$

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