Question

When the temperature becomes sufficiently high, water vapor starts to decompose into hydrogen gas and oxygen gas according to 2H2O(g) A 2H2(g) + O2(g) Using the following data, and assuming that 6CP is constant for this reaction and has an effective value of Cp = 18.88 J mol–1 K–1 over the temperature range in question,

calculate: (a) the value of the decomposition constant at 1000 K

(b) the percent decomposition of water vapor at 1000 K and one bar total pressure.

H2(g) O2(g) H2O(g)

hf (298.15) (kJ mol–1) 0.00 0.00 –241.82

S298.15 o (J K–1 mol–1) 130.684 205.138 188.825

Answer 1