Chapter 17 THERMOCHEMISTRY
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Chapter 17 THERMOCHEMISTRY
- 1.The SI unit of energy is
- A.
Heat capacity.
- B.
Calorie.
- C.
Joule.
- D.
Enthalpy.
- 2.
- A.
2250 cal
- B.
3750 cal
- C.
75.0 cal
- 3.If 1 Calorie 4.18 kJ, how many kJ of energy can be released by an apple containing 125 Cal?
- A.
522 kJ
- B.
29.9 kJ
- C.
5.22 105 kJ
- 4.The temperature of a 6.0-g sample of glass changed from 20C to 45C when it absorbed 550 J of heat. What is the specific heat of this glass sample?
- A.
C0.27 J/gpC
- B.
3.7 J/gp
- C.
2300 J/gpC
- 5.The enthalpy of a system is the same as its:
- A.
Specific heat.
- B.
Heat of combustion.
- C.
Heat content.
- 6.When your body is warmed by an electric blanket during the winter, this process is said to be
- A.
Endothermic.
- B.
Exothermic.
- C.
Isothermic.
- 7.
- A.
325 kJ
- B.
272 kJ
- C.
1.36 kJ
- 8.Given the equation 2Mg(s) O2(g) y2MgO(s) 72.3 kJ, which of the following is true?
- A.
The reaction is endothermic.
- B.
^H72.3 kJ
- C.
^H72.3 kJ
- 9.Given the equation in question 18, how much heat is involved in the production of 5.0 mol of MgO?
- A.
72 kJ
- B.
360 kJ
- C.
180 kJ
- 10.Given the equation Si(s) + 2Cl2(g) ------>SiCl2(g) ------>SiCl2(l) + 687 kJ, how much heat is produced when 106 g of Cl2 react?
- A.
513 kJ
- B.
360 kJ
- C.
180 kJ
- 11.Which of the following statements is true?
- A.
^Hfus^Hsolid
- B.
^Hfus^Hsolid
- C.
^Hsolid is always positive.
- 12.How much heat, in kJ, is required to melt 54.0 g of ice at 0C into water at 0C if ^Hfus for water = 6.01 kJ/mol?
- A.
0.111 kJ
- B.
325 kJ
- C.
18.0 kJ
- 13.How much heat is required to convert 9.00 g of water at 100C into steam at 100C, if ^Hvap for water = 40.7 kJ/mol?
- A.
20.4 kJ
- B.
366 kJ
- C.
18.0 kJ
- 14.If the molar heat of solution of NH4NO3 is 25.7 kJ/mol, how much heat (in kJ) would be required to dissolve 20.0 g of NH4NO3 in water?
- A.
0.250 kJ
- B.
514 kJ
- C.
6.43 kJ
- 15.
- A.
291.9 kJ
- B.
+291.9 kJ
- C.
279.9 k
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