Standard Enthalpy of Combustion
Chemistry ⇒ Thermochemistry and Energetics
Standard Enthalpy of Combustion starts at 11 and continues till grade 12.
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See sample questions for grade 12
A fuel has a standard enthalpy of combustion of –2000 kJ mol–1. If 0.25 mol is burned, how much energy is released?
A student burns 0.5 mol of ethanol (C2H5OH) and measures the energy released as 680 kJ. What is the experimental enthalpy of combustion per mole?
Calculate the enthalpy change when 2 moles of propane (C3H8) are completely combusted, given that the standard enthalpy of combustion of propane is –2220 kJ mol–1.
Describe how the standard enthalpy of combustion of a liquid fuel can be determined experimentally.
Describe the difference between enthalpy of combustion and enthalpy of formation.
Describe the role of oxygen in a standard enthalpy of combustion reaction.
Explain why the enthalpy of combustion of alkanes increases with chain length.
Explain why the enthalpy of combustion of ethanol is less negative than that of propane.
Explain why the enthalpy of combustion of graphite and diamond are different, even though both are forms of carbon.
Explain why the standard enthalpy of combustion values are always negative.
Given the following data: Standard enthalpy of combustion of butane = –2877 kJ mol–1. Calculate the energy released when 5.8 g of butane is burned. (Molar mass of C4H10 = 58 g mol–1)
Given the following data: Standard enthalpy of combustion of ethanol = –1367 kJ mol–1. Calculate the energy released when 23 g of ethanol is burned. (Molar mass of C2H5OH = 46 g mol–1)
Given the following data: Standard enthalpy of combustion of methane = –890 kJ mol–1. Calculate the energy released when 8 g of methane is burned. (Molar mass of CH4 = 16 g mol–1)
Given the following standard enthalpies of combustion: C(graphite): –393.5 kJ mol–1, H2(g): –285.8 kJ mol–1, CH4(g): –890.3 kJ mol–1. Calculate the standard enthalpy of formation of methane.
State the standard enthalpy of combustion of methane in words.
The standard enthalpy of combustion of carbon (graphite) is –393.5 kJ mol–1. What is the enthalpy change for the combustion of 12 g of carbon? (Molar mass of C = 12 g mol–1)
Write the balanced chemical equation for the standard enthalpy of combustion of ethanol, C2H5OH(l).
