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Standard XII

Chemistry

Heat of Formation

Enthalpy of c...

Question

Enthalpy of combustion of carbon to $C O_{2}$ is $- 393.5 k J m o l^{- 1}$ . Calculate the heat released upon formation of 35.2 g of $C O_{2}$ from carbon and dioxygen gas.

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Solution

Formation of $C O_{2}$ from carbon and dioxygen gas can be represented as:
$C_{(s)} + O_{2 (g)} \to C O_{2 (g)} Δ_{f} H = - 393.5 k J m o l^{- 1}$
(1 mole = 44 g)
Heat released on formation of 44 g $C O_{2} = - 393.5 k J m o l^{- 1}$
$∴$ Heat released on formation of 35.2 g $C O_{2}$
$= \frac{- 393.5 k J m o l^{- 1}}{44 g} \times 35.2 g = - 314.8 k J m o l^{- 1}$

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Heat of Formation

Standard XII Chemistry

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Enthalpy of combustion of carbon to CO2 is –393.5 kJ mol−1. Calculate the heat released upon formation of 35.2 g of CO2 from carbon and dioxygen gas.

Formation of CO2 from carbon and dioxygen gas can be represented as: C(s)+O2(g) → CO2(g) ΔfH=−393.5 kJ mol−1 (1 mole = 44 g) Heat released on formation of 44 g CO2=–393.5kJmol–1 ∴ Heat released on formation of 35.2 g CO2 =−393.5 kJ mol−144 g×35.2 g=–314.8 kJ mol−1

Enthalpy of combustion of carbon to $C O_{2}$ is $- 393.5 k J m o l^{- 1}$ . Calculate the heat released upon formation of 35.2 g of $C O_{2}$ from carbon and dioxygen gas.