# Problem: What is ΔH°rxn for the following chemical reaction?CO(g) + NH3(g) → HCN(g) + H2O(g)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)                                                       218N(g)                                                       473H2(g)                                                    0O2(g)                                                    0NH3(g)                                               −45.90O(g)                                                      249CO(g)                                                 −110.5H2O(g)                                              −241.8kJC(g)                                                      71HCN(g)                                               130.5kJC(s)                                                     0HNO3(aq)                                          −206.6

###### FREE Expert Solution

We can use the following equation to solve for ΔH˚rxn:

Note that we need to multiply each ΔH˚f by the stoichiometric coefficient since ΔH˚f is in kJ/mol.

Also, note that ΔH˚f for elements in their standard state is 0.

Reaction: CO(g) + NH3(g) → HCN(g) + H2O(g)

Given:

Element/ Compound                Standard Heat of Formation (kJ/mol)

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###### Problem Details

What is ΔH°rxn for the following chemical reaction?

CO(g) + NH3(g) → HCN(g) + H2O(g)

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 scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.