Thermochemistry Chapter 17 Vocabulary: Endothermic Enthalpy Exothermic Heat Heat capacity Heat of combustion Heat of reaction Hess’s law of summation Molar head of fusion Molar heat of vaporization Specific heat Standard heat of formation Thermochemistry Key Equations: q = mcT mol f = Practice: The molar heat of fusion for ethanol is 4.60 kJ/mol. How many kilojoules are required to melt 24.5 g of ethanol at its freezing point? Ans: 2.45 kJ How much heat, in kJ, must be added to 178 g of water to increase the temperature of the water by 5.0o C? Ans. = 3.7 kJ Hess’s Law practice #84 on page 537 of your text. Ans = -137 kJ Using Table 17.4 on page 530 in your text, calculate the molar heat of combustion of methane, CH4. The products are carbon dioxide gas and water vapor. Ans. = -200.6 kJ/mol
Thermochemistry Chapter 17 Vocabulary: Endothermic Enthalpy Exothermic Heat Heat capacity Heat of combustion Heat of reaction Hess’s law of summation Molar head of fusion Molar heat of vaporization Specific heat Standard heat of formation Thermochemistry Key Equations: q = mcT mol f = Practice: The molar heat of fusion for ethanol is 4.60 kJ/mol. How many kilojoules are required to melt 24.5 g of ethanol at its freezing point? Ans: 2.45 kJ How much heat, in kJ, must be added to 178 g of water to increase the temperature of the water by 5.0o C? Ans. = 3.7 kJ Hess’s Law practice #84 on page 537 of your text. Ans = -137 kJ Using Table 17.4 on page 530 in your text, calculate the molar heat of combustion of methane, CH4. The products are carbon dioxide gas and water vapor. Ans. = -200.6 kJ/mol
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