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Energy Units Conversions 

1.  Convert 23 calories into kcal. 

2. Convert 7.9 kcal into calories. 

3. Convert 234 J into kJ. 

4. Convert 21.3 kJ into joules. 

5. Convert 58 J into calories. 

6.Convert 34 kJ into kcal. 

7. Convert 230 calories into joules. 

8. Convert 61 kcal into kJ. 

9. Convert 2.5 kJ into calories. 

10. Convert 12 kcal into joules. 

11 Convert 490 calories into kJ. 

12 Convert 0.0034 kcal into kJ. 

13. Convert 20.81 J into kJ. 

14. Convert 0.67 kJ into car. 

15. Convert 0.0348 J into kcal. 

16. Convert 29.1 kJ into cat.

17. Convert 98 calories into joules. 

18. Convert 2240 kJ into kcal. 

19. Convert 8000. calories into kJ. 

20. Convert 105 J into kcal. 

Q = mc∆T, where Q = heat energy, m = mass, and ∆T = change in temp. 
Remember, ∆T = (Tfinal – Tinitial).  Show all work and proper units.  

1.  A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C.  Calculate the specific heat capacity of iron. 

2.  How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C? 

3.  Calculate the specific heat capacity of a piece of wood if 1500.0 g of the wood absorbs 67,500 joules of heat, and its temperature changes from 32°C to 57°C. 

4.  100.0 g of 4.0°C water is heated until its temperature is 37°C.  If the specific heat of water is 4.18 J/g°C, calculate the amount of heat energy needed to cause this rise in temperature. 

5.  25.0 g of mercury is heated from 25°C to 155°C, and absorbs 455 joules of heat in the process.  Calculate the specific heat capacity of mercury.