Propane burns in excess oxygen according to the balanced equation For the reaction as…

CHEMISTRY · Multi-part · A Level · Chemistry · Energetics · Energetics

Problem

Propane burns in excess oxygen according to the balanced equation

\text{C}_3\text{H}_8(g) + 5\,\text{O}_2(g) \longrightarrow 3\,\text{CO}_2(g) + 4\,\text{H}_2\text{O}(g)

For the reaction as written,

\Delta H = -2220\;\text{kJ\,mol}^{-1}

298\,\text{K}

. In a laboratory demonstration,

0.150\,\text{mol}

of propane is completely combusted at constant pressure. (a) Calculate the quantity of heat released, in kilojoules, when

0.150\,\text{mol}

of propane combusts. (b) Express the heat calculated in part (a) in joules, using scientific notation. (c) State whether energy is transferred to or from the surroundings. Explain how the sign of

q

you obtained reflects this energy transfer.

Related theory

Thermodynamics
Types of enthalpy
Enthalpy Changes of Reactions

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