The answer to the calculation should be written to the same number of decimal places. If the reactants and products are the same it doesn t matter how the reaction is carried.
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Hess's law worksheet answer key. 10 10 2002 11 33 26 am. Calculate h for the reaction 4 nh3 g 5 o2 g 4 no g 6 h2o g from the following data. 10 22 2014 2 38 00 am company.
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. Deborah herman created date. Hess s law worksheet 1.
Given a series of five multi step chemical reactions students must determine the overall change in entropy for each. Extra practice hess s law problems answers 5. X last modified by.
Kj mole h 2 g 1 2 o 2 g h 2o l h 285 8 kj mole 2. Spadafina susan created date. 02 g 2 n02 g ah 185 k mol reverse equation 1 and ah to put no on the lhs.
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 c 2h 4 g h 2 g c 2h 6 g from the following data. 4 21 2014 6 11 00 pm company.
Answers to hess s law worksheet author. 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. Hess s law worksheet author.
In other words enthalpy is a state function. Kj mole c 2h 6 g 7 2 o 2 g 2 co 2 g 3 h 2o l h 1560. All steps have to proceed at the same temperature and the equations for the individual steps must balance out.
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. Chemistry 120 hess s law worksheet 1.
Answer key join to access all included materials challenge young scholars understanding of thermochemistry with this skills practice worksheet on hess s law. Student worksheet predicting h using hess s law extra exercises lsm 5 4 2. Calculate h for the reaction 4 nh 3 g 5 o.
Student worksheet solutions predicting h using hess s law extra exercises solution lsm 5 4 3.
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