Given the following data:

Question

N2(g)2NO(g)++O2(g)O2(g)2N2O(g)→→→2NO(g),2NO2(g),2N2(g)+O2(g),ΔH=+180.7kJΔH=−113.1kJΔH=−163.2kJ


use Hess's law to calculate ΔH for the following reaction:

N2O(g)+NO2(g)→3NO(g)

Express the enthalpy in kilojoules to four significant digits.

Answer 1

Use the change of enthalpy of the three chemical reactions to calculate the change of enthalpy of the desired reaction. You will have to convert the equations such that the coefficients cancel out.