Question

# The free energy change for the following reactions aregivenbelow-C2H2(g)+O2(g)→2CO2(g)+H2O(l);DG°=–1234KJC(s)+O2(g)→CO2(g);DG°=–394KJ H2(g)+O2(g)→H2O(l);DG°=–237KJWhatisthestandardfreeenergychangeforthe reactionH2(g)+2C(s)→C2H2(g)-

- –209KJ
- –2259 KJ
- + 2259KJ
- 209KJ

## The correct answer is: 209KJ

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Students must know how to open expressions like nCr.

Also, the value of n! is n.(n−1).(n−2).....3.2.1.

Combination is used to select r objects from n objects when the arrangement of the objects does not matter.