Use the data below to answer the questions. Keep in mind that the enthalpy of fo

Question

Use the data below to answer the questions. Keep in mind that the enthalpy of formation of an element in its standard state is zero. The enthalpy changes are different for the two reactions even though all the same elements are involve in equal numbers. This illustrates that the enthalpy change of a reaction is dependent on the states of the reactants and products, as well as how the atoms are bonded. Calculate the enthalpy change, Delta H degree, for the ''expansion'' of methane: CH4 rightarrow C(g) + 4H(g) Express your answer to one decimal place and include the appropriate units. Calculate the enthalpy change, Delta H degree, for the reverse of the formation of methane: Express your answer to one decimal place and include the appropriate units.

Explanation / Answer

1. (4*217.94) + 718.4 + 74.8 KJ = 1665.0 KJ

2. 718.4 + 2* 0 + 74.8 KJ = 793.2 KJ

correction:

1. 1664.9 KJ = 1.7E3 KJ

2. 793.2 KJ = 8.0E2 KJ

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