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Chapter 5: Q34E (page 227)
A teaspoon of the carbohydrate sucrose (common sugar) contains 16 calories (16kcal). What is the mass of one teaspoon of sucrose if the average number of calories for carbohydrates is 4.1 Calories/g?
The mass of one teaspoon of sucrose is approximately 3.9 g.
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A 45-g aluminum spoon (specific heat 0.88 J/g 掳C) at 24掳C is placed in 180 mL (180 g) of coffee at 85掳C and the temperature of the two becomes equal.
(a) What is the final temperature when the two become equal? Assume that coffee has the same specific heat as water.
(b) The first time a student solved this problem she got an answer of 88 掳C. Explain why this is clearly an incorrect answer.
Assume that the coffee has the same density and specific heat as water.
A sample of 0.562 g of carbon is burned in oxygen in a bomb calorimeter, producing carbon dioxide. Assume both the reactants and products are under standard state conditions, and that the heat released is directly proportional to the enthalpy of combustion of graphite. The temperature of the calorimeter increases from 26.74 掳C to 27.93 掳C. What is the heat capacity of the calorimeter and its contents?
What mass of carbon monoxide must be burned to produce 175 kJ of heat under standard state conditions?
Propane, \({{\bf{C}}_{\bf{3}}}{{\bf{H}}_{\bf{8}}}\), is a hydrocarbon that is commonly used as a fuel.
(a) Write a balanced equation for the complete combustion of propane gas.
(b) Calculate the volume of air at 25 掳C and 1.00 atmosphere that is needed to completely combust 25.0 grams of propane. Assume that air is 21.0 percent O2 by volume. (Hint: we will see how to do this calculation in a later
chapter on gases鈥攆or now use the information that 1.00 L of air at 25 掳C and 1.00 atm contains 0.275 g of O2 per liter.)
(c) The heat of combustion of propane is 鈭�2,219.2 kJ/mol. Calculate the heat of formation,螖Hf 掳of propane given that螖Hf 掳of H2O(l) = 鈭�285.8 kJ/mol and螖Hf 掳of CO2(g) = 鈭�393.5 kJ/mol.
(d) Assuming that all of the heat released in burning 25.0 grams of propane is transferred to 4.00 kilograms of water, calculate the increase in temperature of the water.
Question: How much would the temperature of 275 g of water increase if 36.5 kJ of heat were added?
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