246 CHAPTER 6 Thermochemistry 6.53 The specific heat of octane, CgH18(1), is 2.22 J/g-K. (a) How many J of heat are needed to raise the temperature of 80.0 g of octane from 10.0 to 25.0 °C? (b) Which will require more heat, increasing the temperature of 1 mol of CgH18(1) by a certain amount or increasing the temperature of 1 mol of H2O(1) by the same amount? 6.54 Consider the data about gold metal in Exercise 6.26(b). (a) Based on the data, calculate the specific heat of Au(S). (b) Suppose that the same amount of heat is added to twO 10.0-g blocks of metal, both initially at the same tem- perature. One block is gold metal, and one is iron metal. Which block will have the greater rise in temperature after the addition of the heat? (c) What is the molar heat capac- ity of Au(s)? .55 When a 6.50-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter (Figure 6.18), the temperature rises from 21.6 to 37.8 °C. (a) Calculate the quantity of heat (in kJ) released in the reaction. (b) Using your result from part (a), calculate AH (in kJ/mol NaOH) for the solution process. ASsume that the specific heat of the solution is the same as that of pure water. 56 (a) When a 4.25-g sample of solid ammonium nitrate dis- solves in 60.0 g of water in a coffee-cup calorimeter (Figure 6.18), the temperature drops from 22.0 to 16.9°C. Calculate AH (in kJ/mol NH4NO3) for the solution process: NH,NO3(s) – NH4*(aq) + NO3 (aq) Assume that the specific heat of the solution is the same as that of pure water. (b) Is this process endothermic or exothermic? \A 2.200-g sample of quinone (CHLOO) is burnod
246 CHAPTER 6 Thermochemistry 6.53 The specific heat of octane, CgH18(1), is 2.22 J/g-K. (a) How many J of heat are needed to raise the temperature of 80.0 g of octane from 10.0 to 25.0 °C? (b) Which will require more heat, increasing the temperature of 1 mol of CgH18(1) by a certain amount or increasing the temperature of 1 mol of H2O(1) by the same amount? 6.54 Consider the data about gold metal in Exercise 6.26(b). (a) Based on the data, calculate the specific heat of Au(S). (b) Suppose that the same amount of heat is added to twO 10.0-g blocks of metal, both initially at the same tem- perature. One block is gold metal, and one is iron metal. Which block will have the greater rise in temperature after the addition of the heat? (c) What is the molar heat capac- ity of Au(s)? .55 When a 6.50-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter (Figure 6.18), the temperature rises from 21.6 to 37.8 °C. (a) Calculate the quantity of heat (in kJ) released in the reaction. (b) Using your result from part (a), calculate AH (in kJ/mol NaOH) for the solution process. ASsume that the specific heat of the solution is the same as that of pure water. 56 (a) When a 4.25-g sample of solid ammonium nitrate dis- solves in 60.0 g of water in a coffee-cup calorimeter (Figure 6.18), the temperature drops from 22.0 to 16.9°C. Calculate AH (in kJ/mol NH4NO3) for the solution process: NH,NO3(s) – NH4*(aq) + NO3 (aq) Assume that the specific heat of the solution is the same as that of pure water. (b) Is this process endothermic or exothermic? \A 2.200-g sample of quinone (CHLOO) is burnod
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Chapter6: Thermochemisty
Section: Chapter Questions
Problem 6.35QP: A 250-g sample of water at 20.0C is placed in a freezer that is held at a constant temperature of...
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Transcribed Image Text:246
CHAPTER 6 Thermochemistry
6.53 The specific heat of octane, CgH18(1), is 2.22 J/g-K. (a) How
many J of heat are needed to raise the temperature of 80.0 g
of octane from 10.0 to 25.0 °C? (b) Which will require more
heat, increasing the temperature of 1 mol of CgH18(1) by
a certain amount or increasing the temperature of 1 mol of
H2O(1) by the same amount?
6.54 Consider the data about gold metal in Exercise 6.26(b).
(a) Based on the data, calculate the specific heat of Au(S).
(b) Suppose that the same amount of heat is added to twO
10.0-g blocks of metal, both initially at the same tem-
perature. One block is gold metal, and one is iron metal.
Which block will have the greater rise in temperature after
the addition of the heat? (c) What is the molar heat capac-
ity of Au(s)?
.55 When a 6.50-g sample of solid sodium hydroxide dissolves
in 100.0 g of water in a coffee-cup calorimeter (Figure 6.18),
the temperature rises from 21.6 to 37.8 °C. (a) Calculate the
quantity of heat (in kJ) released in the reaction. (b) Using
your result from part (a), calculate AH (in kJ/mol NaOH)
for the solution process. ASsume that the specific heat of the
solution is the same as that of pure water.
56 (a) When a 4.25-g sample of solid ammonium nitrate dis-
solves in 60.0 g of water in a coffee-cup calorimeter (Figure
6.18), the temperature drops from 22.0 to 16.9°C. Calculate
AH (in kJ/mol NH4NO3) for the solution process:
NH,NO3(s) –
NH4*(aq) + NO3 (aq)
Assume that the specific heat of the solution is the same
as that of pure water. (b) Is this process endothermic or
exothermic?
\A 2.200-g sample of quinone (CHLOO) is burnod
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