Question:
In a combustion reaction, heat change during the formation of 40 g of carbon dioxide from carbon and dioxygen gas is (Enthalpy of combustion of carbon = -396 kJ mol\(^1\))
In a combustion reaction, heat change during the formation of 40 g of carbon dioxide from carbon and dioxygen gas is (Enthalpy of combustion of carbon = -396 kJ mol\(^1\))
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To calculate heat change, use the enthalpy of combustion and multiply it by the number of moles involved in the reaction.
Updated On: Mar 7, 2025
- 320 kJ
- -320 kJ
- -360 kJ
- 360 kJ
- 240 kJ
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The Correct Option is C
Solution and Explanation
Step 1: The moles of CO\(_2\) are calculated using its molar mass (44 g/mol), yielding 40/44 = 0.909 moles of CO\(_2\).
Step 2: The heat change is then calculated using the enthalpy of combustion for carbon: \[ {Heat change} = 0.909 \times (-396) = -360 \, {kJ}. \]
Step 2: The heat change is then calculated using the enthalpy of combustion for carbon: \[ {Heat change} = 0.909 \times (-396) = -360 \, {kJ}. \]
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