Homework Help: chem urgent!

Posted by hannah on Tuesday, November 6, 2012 at 10:20am.

Set up a Hess's law cycle, and use the following information to calculate ÄH°f for aqueous nitric acid, HNO3(aq). You will need to use fractional coefficients for some equations.

3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) ÄH° = -138.4 kJ
2 NO(g) + O2(g) 2 NO2(g) ÄH° = -114 kJ
4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(l) ÄH° = -1169.6 kJ
NH3(g) ÄH°f = -46.1 kJ/mol
H2O(l)

chem urgent! - DrBob222, Tuesday, November 6, 2012 at 5:31pm
Where does the H2O(l) by itself at the bottom of your post fit in?
chem urgent! - rebekah, Tuesday, November 6, 2012 at 6:33pm
the h2o is

ÄH°f = -285.8 kJ/mol

Answer this Question

Related Questions

Chemistry - Use Hess's law to calculate the enthalpy change for the reaction...
chemistry - Use Hess's law and the following equations to calculate ÄH...
chem- i reallyneed help - Consider the following equations. N2H4(l) + O2(g) N2(g...
chem - An aqueous solution of nitric acid has a density of 1.084 g mL-1 and a ...
Chemistry - Calculate the molarity of the solutions made by dissolving the ...
please check my answer - Consider the following equations. N2H4(l) + O2(g) N2(g...
Chemistry - Use Hess' Law to calculate the heat of the following equation. ...
Chemistry(Please help) - Calculate the concentration of HCO3- in an aqueous ...
chem expirement! - You are required to design an experiment to test Hess's ...
chem experiment: - You are required to design an experiment to test Hess's ...

For Further Reading

First Name:
School Subject:
Answer: