calculate ΔHºrxn for the following chemical reaction: 3NO2 (g) + H2O (l) --> 2HNO3(aq) + NO(g) Given: Species ΔHf (kJ/mol) N O2 33.2 H2 O -285.8 H N O3 -207 N O 91.3
- Use standard enthalpies of formation to calculate ΔHºrxn for the following
3NO2 (g) + H2O (l) --> 2HNO3(aq) + NO(g)
Given:
| Species | ΔHf (kJ/mol) |
| N O2 | 33.2 |
| H2 O | -285.8 |
| H N O3 | -207 |
| N O | 91.3 |
Do not type any units with your answer. If the answer is exothermic be sure to include the appropriate sign. Report your answer to 1 decimal place.
-Consider the problem below:
(Equation 1) 2 Ca(s) + O2(g) ---> 2 CaO(s) ΔH = -1270.2 kJ
(Equation 2) 4 Zn(s) + 2 O2(g) ---> 4 ZnO(s) ΔH = -696.6 kJ
(Equation 3) 4 Ca(s) + 4 ZnO(s) ---> 4 Zn(s) + 4 CaO(s) ΔH = ???
To find ΔH for equation 3 you must:
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Consider the problem below:
(Equation 1) 2 "C"a(s) + O2(g) arrow 2 "C" a O(s) ΔH = minus 1270.2 kJ
(Equation 2) 4 Zn(s) + 2 O2(g) arrow 4 Z n O(s) ΔH = minus 696.6 kJ
(Equation 3) 4 "C"a(s) + 4 Z n O(s) arrow 4 Zn(s) + 4 "C"a O(s) ΔH = ???
To find ΔH for equation 3 you must:
- multiply equation 1 only
- multiply equation 2 only
- multiply equation 1 and equation 2
- multiply neither equation 1 nor equation 2.
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