Temperature and Phase Changes Answers
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1 Temperature and Phase Changes Answers Part A 1. a) How many kilojoules are required to heat kg of Au from 15.0 C to 85.0 C? Q mc T Q (0.200 kg)(0.129 kj/kg C)(70.0 C) 1.81 kj b) If the same amount of heat is added to kg of water at 15.0 C, what will be the final temperature? Q mc T ΔT finalt Q mc 1.81kJ 0.200kg ( )( 4.18kJkg C) 15.0 C C 17.2 C 2.16 C 2. How much heat is required to change the temperature of each of the following from 15.0 C to 60.0 C? a) 35.0 g of water Q mc T Q (35.0 g)(4.18 J/g C)(45.0 C) J 6580 K or 6.58 kj b) 35.0 g of Pyrex glass (c pyrex kj/kg C) Q mc T Q (35.0 g)(0.840 J/g C)(45.0 C) 1323 J 1320 K or 1.32 kj c) 35.0 g of Pt Q mc T Q (35.0 g)(0.133 J/g C)(45.0 C) J 209 J or kj 3. Find the energy needed to heat g of water from 25.3 C to 75.0 C. Q mc T Q (150.0 g)(4.18 J/g C)(49.7 C) J J or 31.2 kj Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 1 of 10
2 x 10 2 g of ice were cooled from 10.0 C to 41.5 C. Find the heat released. Q mc T Q (500. g)(2.06 J/g C)(-31.5 C) J Q J or 32.4 kj or 32.4 kj released g of steam at C were cooled, releasing 2.50 kj of heat. Find the new temperature of the steam. Q mc T ΔT finalt Q mc kJ kg ( )( 2.02kJ kg C) C 24.8 C C 24.8 C g of pure gold was heated from 21.8 C to 55.3 C. Find the heat energy required. Q mc T Q (250.0 g)(0.129 J/g C)(33.5 C) J 1080 J 1.08 kj 7. a) How many kilojoules are required to heat kg of Cu from 10.0 C to C? Q mc T Q (0.100 kg)(0.385 kj/kg C)(90.0 C) 3.46 kj b) The same quantity of heat is added to kg of Al at 10.0 C. Which metal reaches the higher temperature, the Cu or the Al? The copper reaches the higher temperature because it has the lower specific heat capacity. The specific heat capacity is equal to the amount of energy required to change the temperature of one gram of a substance by one degree Celsius, therefore, the smaller the heat capacity, the larger the temperature change for the same amount of added heat kj of heat energy was applied to 10.0 g of copper at 30.0 C. The same amount of energy was used to heat 10.0 g of aluminum at 30.0 C. Which metal reaches the highest temperature? The copper reaches the higher temperature because it has the lower specific heat capacity. The specific heat capacity is equal to the amount of energy required to change the temperature of one gram of a substance by one degree Celsius, therefore, the smaller the heat capacity, the larger the temperature change for the same amount of added heat. Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 2 of 10
3 Part B 9. Find the heat energy needed to melt 48.0 g of ice at 0.00 C. n mass molar mass ΔH nh 48.0g 2.66mol g mol ( 2.66mol)( 6.03 kj mol) 16.1kJ fus 10. How much heat energy is released when 1.00 kg of steam at C is condensed to water at C? n q q mass molar mass nhvap ( 55.5mol)( kj mol) -2260kJ or 2260kJ released 1000g 55.5mol g mol 2260kJ 11. Find the heat energy needed to melt 4.00 x 10 2 g of copper at its melting point. The molar heat of fusion for copper is 13.0 kj/mol. n q nh mass molar mass 400.g 6.29mol g mol ( 6.29mol)( 13.0 kj mol) 81.8kJ fus 12. What mass of ethanol could be vapourized at its boiling point of 78.3 C if kj of heat energy was consumed? The molar heat of vapourization of ethanol is 40.5 kj/mol. q nh q n H fus mass fus 250.0kJ 6.17mol 40.5 kj mol ( mol)( molar mass) ( 6.17mol)( g mol) 284gC H OH 2 5 Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 3 of 10
4 13. Find the molar heat of fusion of sodium chloride if kj of heat energy was required to melt g of sodium chloride at its melting point of C. n q nh H fus mass molar mass fus q n 103.3kJ 3.42mol g 3.42mol g mol 30.2kJmol Part C 14. Calculate the amount of energy to melt 5.00 kg of aluminum pop cans initially at 25.0 C. The molar enthalpy of fusion of aluminum is 10.8 kj/mol. q (25.0 C 660. C) + (melt) q mc T + nh fus q (5.00 kg)(0.900 kj/kg C)(635 C) + (185.3 mol)(10.8 kj/mol) q 2857 kj kj q 4860 kj 15. How much heat is given up when 20.0 g of steam at C is cooled to 15.0 C? q (120.0 C C) + (condense) + (100.0 C 0.0 C) + (freeze) + (0.0 C C) q mc T + nh vap + mc T + nh fus + mc T q ( kg)(2.02 kj/kg C)( 20.0 C) + (1.11 mol)( 40.8 kj/mol) + ( kg)(4.18 kj/kg C)( C) + (1.11 mol)( 6.03 kj/mol) + ( kg)(2.06 kj/kg C)( 15.0 C) q kj kj 8.36 kj 6.69 kj kj q kj or 61.8 kj released Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 4 of 10
5 16. How much heat is required to convert 45.0 g of ice at C into steam at C? q ( C 0.0 C) + (melt) + (0.0 C C) + (boil) + (100.0 C C) q mc T + nh fus + mc T + nh vap + mc T q ( kg)(2.06 kj/kg C)(115.0 C) + (2.50 mol)(6.03 kj/mol) + ( kg)(4.18 kj/kg C)(100.0 C) + (2.50 mol)(40.8 kj/mol) + ( kg)(2.02 kj/kg C)(120.0 C) q kj kj kj kj kj q 157 kj 17. Find the heat required when 80.0 g of water at 25.0 C are converted to steam at C. q (0.0 C C) + (boil) q mc T + nh vap q ( kg)(4.18 kj/kg C)(75.0 C) + (4.44 mol)(40.8 kj/mol) q kj kj q 206 kj 18. a) How many kilojoules are required to heat kg of Au from 25.0 C to C? q mc T q (0.450 kg)(0.129 kj/kg C)(240.0 C) q 13.9 kj b) If the same amount of heat is added to kg of ice at 10.0 C, what will be the final water temperature? q (-10.0 C 0.0 C) + (melt) + (0.0 C T) q mc T + nh fus + mc T 13.9 kj ( kg)(2.06 kj/kg C)(10.0 C) + (1.94 mol)(6.03 kj/mol) + ( kg)(4.18 kj/kg C)(T 0.0 C) 13.9 kj kj kj kj/ C T 0 kj kj kj/ C T T 10.2 C Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 5 of 10
6 19. Find the heat required to heat 40.0 g of ice at 25.0 C and convert it to steam at C q (-25.0 C 0.0 C) + (melt) + (0.0 C C) + (boil) + (100.0 C C) q mc T + nh fus + mc T + nh vap + mc T q ( kg)(2.06 kj/kg C)(25.0 C) + (2.22 mol)(6.03 kj/mol) + ( kg)(4.18 kj/kg C)(100.0 C) + (2.22 mol)(40.8 kj/mol) + ( kg)(2.02 kj/kg C)(30.0 C) q 2.06 kj kj kj kj kj q 125 kj g of steam at C was converted to water at 25.0 C. Find the heat released. q (condense) + (100.0 C 25.0 C) q nh vap + mc T q (1.998 mol)( 40.8 kj/mol) + ( kg)(4.18 kj/kg C)( 75.0 C) q kj kj q kj or 92.8 kj released Part D g of anthracite coal gives off about 30.6 kj when burned. What mass of coal is required to heat 3.50 L of water from 10.0 C to 95.0 C? heat gained by water heat lost by coal water (10 C 95 C) q mc T q (3.50 kg)(4.18 kj/kg C)(85.0 C) q kj the coal must supply 1240 kj 1gcoal 30.6 kj x kj x of coal needed 40.6g Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 6 of 10
7 22. Determine the resulting temperature when g of ice at 20.0 C is mixed with 9.00 kg of water at 50.0 C. heat gained by the ice heat lost by the water (-20.0 C 0.0 C) + (melt) + (0.0 C T) (50.0 C T) q q mc T + nh fus + mc T -[mc T] (0.150 kg)(2.06 kj/kg C)(20.0 C) + (8.32 mol)(6.03 kj/mol) + (0.150 kg)(4.18 kj/kg C)(T 0.0 C) [(9.00 kg)(4.18 kj/kg C)(T C)] 6.18 kj kj kj/ C T 0 kj [37.62 kj/ C T 1881 kj] 6.18 kj kj kj/ C T 0 kj 1881 kj kj/ C T kj/ C T kj/ C T 1881 kj 6.18 kj 50.2 kj kj/ C T kj T 47.7 C 23. Determine the resulting temperature when 1.00 kg of ice at 20.0 C is mixed with 3.60 kg of water at 65.0 C. heat gained by the ice heat lost by the water (-20.0 C 0.0 C) + (melt) + (0.0 C T) (65.0 C T) q q mc T + nh fus + mc T [mc T] (1.00 kg)(2.06 kj/kg C)(20.0 C) + (55.5 mol)(6.03 kj/mol) + (1.00 kg)(4.18 kj/kg C)(T 0.0 C) [(3.60 kg)(4.18 kj/kg C)(T 65.0 C)] 41.2 kj kj kj/ C T 0 kj [15.05 kj/ C T kj] 41.2 kj kj kj/ C T 0 kj kj kj/ C T kj/ C T kj/ C T kj 41.2 kj kj kj/ C T kj T 31.3 C Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 7 of 10
8 24. a) If g of water at 0.00 C is added to g of water at 90.0 C, what will be the final temperature of the water? (0.0 C T) (90.0 C T) q q mc T [mc T] (150.0 g)(4.18 J/g C)(T 0.0 C) [(100.0 g)(4.18 J/g C)(T 90.0 C)] 627 J/ C T 0 J [418 J/ C T J] 627 J/ C T J J/ C T 627 J/ C T J/ C T J 1045 J/ C T J T 36.0 C b) If g of Au at C is added to g of water at 5.00 C, what will be the final temperature of the Au? (100.0 C T) (5.00 C T) q q mc T [mc T] (250.0 g)(0.129 J/g C)(T C) [(500.0 g)(4.18 J/g C)(T 5.00 C)] J/ C T 3225 J [2090 J/ C T J] J/ C T 3225 J J J/ C T J/ C T J/ C T J J J/ C T J T 6.44 C Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 8 of 10
9 25. Coal provides 30.5 kj of energy per gram burned. Find the mass of coal required to heat 5.00 L of water from 10.0 C to 85.0 C. heat gained by water heat lost by coal water (10 C 85 C) q mc T q (5.00 kg)(4.18 kj/kg C)(75.0 C) q kj the coal must supply kj 1gcoal 30.6 kj x kj x of coal needed 51.4g L of water at 70.0 C was cooled by adding kg of ice at 10.0 C. Calculate the final temperature. (-10.0 C 0.0 C) + (melt) + (0.0 C T) (70.0 C T) q q mc T + nh fus + mc T [mc T] (0.500 kg)(2.06 kj/kg C)(10.0 C) + (27.75 mol)(6.03 kj/mol) + (0.500 kg)(4.18 kj/kg C)(T 0.0 C) [(5.00 kg)(4.18 kj/kg C)(T 70.0 C)] 10.3 kj kj kj/ C T 0 kj [20.9 kj/ C T 1463 kj] 10.3 kj kj kj/ C T 1463 kj 20.9 kj/ C T 2.09 kj/ C T kj/ C T 1463 kj 10.3 kj kj kj/ C T kj T 55.9 C Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 9 of 10
10 g of water at 32.5 C had the following metals placed in it: 78.0 g of silver at 90.0 C 39.5 g of aluminum at 78.0 C 55.0 g of copper at 85.0 C Calculate the final temperature of all substances. Heat gained by water heat lost by silver + aluminum + copper (32.5 C T) (90.0 C T) + (78.0 C T) + (85.0 C T) q q [mcδt] mc T + mc T + mc T [(250.0 g)(4.18 J/g C)(T 32.5 C)] (78.0 g)(0.237 J/g C)(T 90.0 C) + (39.5 g)(0.900 J/g C)(T 78.0 C) + (55.0 g)(0.385 J/g C)(T 85.0 C) [1045 J/ C T J] J/ C T J J/ C T J J/ C T J 1045 J/ C T J J/ C T J J J J/ C T J/ C T J J/ C T T 35.9 C 28. Water at 50.0 C was cooled to 0.00 C by adding g of ice at 0.00 C. Calculate the mass of water cooled. (Assume the ice just melts.) 29. When 1.00 g of propane is burned, about 2.36 kj of heat is given off. What mass of water at 50.0 C can be converted into super-heated steam at C when 4.00 mol of propane are burned? 30. If 50.0 g of steam at C is added to g of ice at 45.0 C, what will be the final temperature of the system? 31. If 85.0 g of steam at C is added to g of ice at 20.0 C, what will be the final temperature of the system? 32. The average body temperature of a healthy human is 37.0 C. What mass of steam at C must be added to g of ice at 30.0 C to produce water having the same temperature as a human body? 33. What mass of water at 50.0 C was cooled, and converted to ice at 20.0 C, if 84.7 kj of heat energy was released? 34. What mass of steam at C is required to heat g of water from 25.0 C to 60.0 C? 35. What mass of ice at 10.0 C must be added to 125 g of steam at C to produce water at C? 36. Calculate the mass of steam at C that is required to raise the temperature of kg of V from 5.00 C to 60.0 C? Chemistry 12 L. Farrell - Thermochemistry Temperature and Phase Changes Answers Page 10 of 10
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