11) 11) Given the following reactions AH = -28.0 kJ Fe2O3 (s) + 3CO (s) - 2Fe (s) + 3CO2 (g) AH = +12.5 kJ %3D 3Fe (s) + 4CO2(s) - 4CO (g) + Fe304(s) the enthalpy of the reaction of Fe2O3 with CO 3Fe2O3 (s) + CO (g) - CO2 (g) + 2Fe3O4 (s) is kJ. A) +109 B) -15.5 C) -109 D) -59.0 E) 40.5 12) D 12) Given the data in the table below, AH°rxn for the reaction 3NO2 (g) + H2O (1) – 2HNO3 (aq) + NO (g) is kJ. Substance AH°f (kJ/mol) H2O (1) -286 NO (g) NO2 (g) 90 34 HNO3 (aq) -207 NH3 (g) -46 A) 140 B) 64 C) -64 D) -140 E) -508 B. 13) A sample of calcium carbonate [CACO3 (s)] absorbs 40.3 J of heat, upon which the temperature of the sample increases from 20.8 °C to 27.3 °C. If the specific heat of calcium carbonate is 0.82 J/g-K, what is the mass (in grams) of the sample? A) 5.1 g B) 7.6 g C) -7.6 g D) 0.13 g E) 5.3 g 14) D 14) The temperature of a 35.1 g sample of iron increases from 24.5 °C to 31.8 °C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed? A) 0.722 J B) 0.0936 J C) -115 J D) 115 J E) 3.29 J CORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 15) 455 15) The AHrxn for the combustion of methane is -890.0 kJ. How much heat energy (k]) is released if 82.1 grams of methane are burned in an excess amount of oxygen?
11) 11) Given the following reactions AH = -28.0 kJ Fe2O3 (s) + 3CO (s) - 2Fe (s) + 3CO2 (g) AH = +12.5 kJ %3D 3Fe (s) + 4CO2(s) - 4CO (g) + Fe304(s) the enthalpy of the reaction of Fe2O3 with CO 3Fe2O3 (s) + CO (g) - CO2 (g) + 2Fe3O4 (s) is kJ. A) +109 B) -15.5 C) -109 D) -59.0 E) 40.5 12) D 12) Given the data in the table below, AH°rxn for the reaction 3NO2 (g) + H2O (1) – 2HNO3 (aq) + NO (g) is kJ. Substance AH°f (kJ/mol) H2O (1) -286 NO (g) NO2 (g) 90 34 HNO3 (aq) -207 NH3 (g) -46 A) 140 B) 64 C) -64 D) -140 E) -508 B. 13) A sample of calcium carbonate [CACO3 (s)] absorbs 40.3 J of heat, upon which the temperature of the sample increases from 20.8 °C to 27.3 °C. If the specific heat of calcium carbonate is 0.82 J/g-K, what is the mass (in grams) of the sample? A) 5.1 g B) 7.6 g C) -7.6 g D) 0.13 g E) 5.3 g 14) D 14) The temperature of a 35.1 g sample of iron increases from 24.5 °C to 31.8 °C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed? A) 0.722 J B) 0.0936 J C) -115 J D) 115 J E) 3.29 J CORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 15) 455 15) The AHrxn for the combustion of methane is -890.0 kJ. How much heat energy (k]) is released if 82.1 grams of methane are burned in an excess amount of oxygen?
Chapter6: Thermochemistry
Section: Chapter Questions
Problem 104AE
Related questions
Question
Question 11
![11)
11) Given the following reactions
AH = -28.0 kJ
Fe2O3 (s) + 3CO (s) - 2Fe (s) + 3CO2 (g)
AH = +12.5 kJ
%3D
3Fe (s) + 4CO2(s) - 4CO (g) + Fe304(s)
the enthalpy of the reaction of Fe2O3 with CO
3Fe2O3 (s) + CO (g) - CO2 (g) + 2Fe3O4 (s)
is
kJ.
A) +109
B) -15.5
C) -109
D) -59.0
E) 40.5
12) D
12) Given the data in the table below, AH°rxn for the reaction
3NO2 (g) + H2O (1) – 2HNO3 (aq) + NO (g)
is
kJ.
Substance AH°f (kJ/mol)
H2O (1)
-286
NO (g)
NO2 (g)
90
34
HNO3 (aq)
-207
NH3 (g)
-46
A) 140
B) 64
C) -64
D) -140
E) -508
B.
13) A sample of calcium carbonate [CACO3 (s)] absorbs 40.3 J of heat, upon which the temperature of
the sample increases from 20.8 °C to 27.3 °C. If the specific heat of calcium carbonate is 0.82 J/g-K,
what is the mass (in grams) of the sample?
A) 5.1 g
B) 7.6 g
C) -7.6 g
D) 0.13 g
E) 5.3 g
14) D
14) The temperature of a 35.1 g sample of iron increases from 24.5 °C to 31.8 °C. If the specific heat of
iron is 0.450 J/g-K, how many joules of heat are absorbed?
A) 0.722 J
B) 0.0936 J
C) -115 J
D) 115 J
E) 3.29 J
CORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
15) 455
15) The AHrxn for the combustion of methane is -890.0 kJ. How much heat energy (k]) is
released if 82.1 grams of methane are burned in an excess amount of oxygen?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1cdef31d-0fd6-49ca-a823-5c1cf3cbca2c%2F93025c90-f7a1-49a3-955b-5776d0dcf140%2Fpm4at8e.jpeg&w=3840&q=75)
Transcribed Image Text:11)
11) Given the following reactions
AH = -28.0 kJ
Fe2O3 (s) + 3CO (s) - 2Fe (s) + 3CO2 (g)
AH = +12.5 kJ
%3D
3Fe (s) + 4CO2(s) - 4CO (g) + Fe304(s)
the enthalpy of the reaction of Fe2O3 with CO
3Fe2O3 (s) + CO (g) - CO2 (g) + 2Fe3O4 (s)
is
kJ.
A) +109
B) -15.5
C) -109
D) -59.0
E) 40.5
12) D
12) Given the data in the table below, AH°rxn for the reaction
3NO2 (g) + H2O (1) – 2HNO3 (aq) + NO (g)
is
kJ.
Substance AH°f (kJ/mol)
H2O (1)
-286
NO (g)
NO2 (g)
90
34
HNO3 (aq)
-207
NH3 (g)
-46
A) 140
B) 64
C) -64
D) -140
E) -508
B.
13) A sample of calcium carbonate [CACO3 (s)] absorbs 40.3 J of heat, upon which the temperature of
the sample increases from 20.8 °C to 27.3 °C. If the specific heat of calcium carbonate is 0.82 J/g-K,
what is the mass (in grams) of the sample?
A) 5.1 g
B) 7.6 g
C) -7.6 g
D) 0.13 g
E) 5.3 g
14) D
14) The temperature of a 35.1 g sample of iron increases from 24.5 °C to 31.8 °C. If the specific heat of
iron is 0.450 J/g-K, how many joules of heat are absorbed?
A) 0.722 J
B) 0.0936 J
C) -115 J
D) 115 J
E) 3.29 J
CORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
15) 455
15) The AHrxn for the combustion of methane is -890.0 kJ. How much heat energy (k]) is
released if 82.1 grams of methane are burned in an excess amount of oxygen?
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