Calculate h for the reaction 4 nh 3 g 5 o. Worksheet hess law hess law hess law states that the heat evolved in a given process can be expressed as the sum of the heats of several processes that when added yield the process of interest.
The answer to the calculation should be written to the same number of decimal places.
Hess s law worksheet answer key. In other words enthalpy is a state function. 02 g 2 n02 g ah 185 k mol reverse equation 1 and ah to put no on the lhs. All steps have to proceed at the same temperature and the equations for the individual steps must balance out.
Answers to hess s law worksheet author. Student worksheet predicting h using hess s law extra exercises lsm 5 4 2. Hess s law worksheet author.
Student worksheet solutions predicting h using hess s law extra exercises solution lsm 5 4 3. Answer key join to access all included materials challenge young scholars understanding of thermochemistry with this skills practice worksheet on hess s law. 10 10 2002 11 33 26 am.
Calculate h for the reaction c 2h 4 g h 2 g c 2h 6 g from the following data. 4 21 2014 6 11 00 pm company. Deborah herman created date.
X last modified by. Hess s law is due to enthalpy being a state function which allows us to calculate the overall change in enthalpy by simply summing up the changes for each step of the way until product is formed. Extra practice hess s law problems answers 5.
C 2h 4 g 3 o 2 g 2 co 2 g 2 h 2o l h 1411. N2 g o2 g 2 no g h 180 5 kj n2 g 3 h2 g 2 nh3 g h 91 8 kj 2 h2 g o2 g 2 h2o g h 483 6 kj. Hess s law worksheet 1.
Spadafina susan created date. If the reactants and products are the same it doesn t matter how the reaction is carried. Chemistry 120 hess s law worksheet 1.
Kj mole h 2 g 1 2 o 2 g h 2o l h 285 8 kj mole 2. 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. Calculate h for the reaction 4 nh3 g 5 o2 g 4 no g 6 h2o g from the following data.
Given a series of five multi step chemical reactions students must determine the overall change in entropy for each. Kj mole c 2h 6 g 7 2 o 2 g 2 co 2 g 3 h 2o l h 1560. 10 22 2014 2 38 00 am company.
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