X last modified by. Hess s law practice problems answers determine ho for each of the following problems.
Find the standard molar enthalpy for the reaction c s o 2 g co g given that c s o 2 g co 2 g h o.
Hess's law worksheet answers. C s gr o 2 g co 2 g. Find the δh of the following reaction. B second eq do not flip it divide through by two no flip because we need to cancel the sro divide by two because we only need to cancel one sro.
4 16 2009 6 04 00 pm company. Most calculations follow from it. Brooklyn city board of education other titles.
The enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs. Hess s law is saying that if you convert reactants a into products b. C 2h 4 g 3 o 2 g 2 co 2 g 2 h 2o l h 1411.
Hess s law is the most important law in this part of chemistry. 1 analyze what must happen to each equation. Hess s law worksheet author.
The answer to the calculation should be written to the same number of decimal places. Use a separate piece of paper to show your work. 1 find the δh for the reaction below given the following reactions and subsequent δh values.
Chemistry 120 hess s law worksheet 1. They will not be collected nor will these particular questions be asked on an exam. Hess s law worksheet created date.
Doing these problems however will certainly help you understand hess s law better. 02 g 2 n02 g ah 185 k mol reverse equation 1 and ah to put no on the lhs. Kj mole c 2h 6 g 7 2 o 2 g 2 co 2 g 3 h 2o l h 1560.
Deborah herman created date. Student worksheet solutions predicting h using hess s law extra exercises solution lsm 5 4 3. Calculate h for the reaction c 2h 4 g h 2 g c 2h 6 g from the following data.
You can always check your answer using molar enthalpies of formation ho f 1. Answers to hess s law worksheet author. 10 22 2014 2 38 00 am company.
4 21 2014 6 11 00 pm company. Calculate h for the reaction 4 nh 3 g 5 o. Extra practice hess s law problems answers 5.
A first eq flip it this put the co 2 on the right hand side where we want it. The following is a list of some extra hess s law problems. Kj mole h 2 g 1 2 o 2 g h 2o l h 285 8 kj mole 2.
Kavita gupta last modified by. Spadafina susan created date. Solution the measured enthalpy changes must be manipulated so that n2 is cancelled out because it is not required in the reaction for which you are solving for ah.