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:

ΔH°rxn=ΔH°f, prod-ΔH°f, react


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

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