What is ΔH°rxn for the following chemical reaction?
You can use the following table of standard heats of formation (ΔH°f) to calculate the enthalpy of the given reaction.
Express the standard enthalpy of reaction to three significant figures and include the appropriate units.
Element/ Compound Standard Heat of Formation (kJ/mol)
H(g) 218
N(g) 473
H2(g) 0
O2(g) 0
NH3(g) −45.90
O(g) 249
CO(g) −110.5
H2O(g) −241.8kJ
C(g) 71
HCN(g) 130.5kJ
C(s) 0
HNO3(aq) −206.6
What is ΔH°rxn for the following chemical reaction?
You can use the following table of standard heats of formation (ΔH°f) to calculate the enthalpy of the given reaction.
Express the standard enthalpy of reaction to three significant figures and include the appropriate units.
Element/ Compound Standard Heat of Formation (kJ/mol)
H(g) 218
N(g) 473
H2(g) 0
O2(g) 0
NH3(g) −45.90
O(g) 249
CO(g) −110.5
H2O(g) −241.8kJ
C(g) 71
HCN(g) 130.5kJ
C(s) 0
HNO3(aq) −206.6
Related textbook solutions
Basic Chemistry
Principles of Chemistry Molecular Approach
Chemistry: Structure and Properties
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Chemistry: A Molecular Approach
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Principles of Chemistry: A Molecular Approach
Chemistry: The Central Science
Related questions
Part A
What is
?
H
?
rxn
for the following chemical reaction?
C
S
2
(g)+2
H
2
O(l)?C
O
2
(g)+2
H
2
S(g)
You can use the following table of standard heats offormation
(?
H
?
f
)
to calculate the enthalpy of the given reaction.
Element/ Compound | Standard Heat of Formation (kJ/mol) | Element/ Compound | Standard Heat of Formation (kJ/mol) |
H(g) | 218 | N(g) | 473 |
| H 2 (g) | 0 | O 2 (g) | 0 |
| H 2 O(l) | ?285.8 | O(g) | 249 |
| C S 2 (g) | 116.7 | H 2 S(g) | ?20.60kJ |
C(g) | 71 | C O 2 (g) | ?393.5kJ |
C(s) | 0 | HN O 3 (aq) | ?206.6 |
Express the standard enthalpy of reaction to threesignificant figures and include the appropriate units.
Part A
What is
?
H
?
rxn
for the following chemical reaction?
C
S
2
(g)+2
H
2
O(l)?C
O
2
(g)+2
H
2
S(g)
You can use the following table of standard heats offormation
(?
H
?
f
)
to calculate the enthalpy of the given reaction.
Element/ Compound | Standard Heat of Formation (kJ/mol) | Element/ Compound | Standard Heat of Formation (kJ/mol) |
H(g) | 218 | N(g) | 473 |
| H 2 (g) | 0 | O 2 (g) | 0 |
| H 2 O(l) | ?285.8 | O(g) | 249 |
| C S 2 (g) | 116.7 | H 2 S(g) | ?20.60kJ |
C(g) | 71 | C O 2 (g) | ?393.5kJ |
C(s) | 0 | HN O 3 (aq) | ?206.6 |
Express the standard enthalpy of reaction to threesignificant figures and include the appropriate units.
Top fuel dragsters and funny cars burn nitromethane as fuel according to this balanced combustion equation:
The enthalpy of combustion for nitromethane is 
Standard Enthalpies of Formation at 25 ∘C
| Substance | ΔH∘f(kJ/mol) |
| CO2(g) | −393.5 |
| CO2(aq) | −413.8 |
| N(g) | 472.7 |
| N2(g) | 0 |
| O(g) | 249.2 |
| O2(g) | 0 |
| H2O(l) | −285.8 |
| H2O(g) | −241.8 |
