Water gas is the name for the mixture of CO and H_2 prepared by reaction of stea

Question

Water gas is the name for the mixture of CO and H_2 prepared by reaction of steam with carbon at 1000 degree C: C(s) + O_2(g) rightarrow CO(g) + H_2(g) The hydrogen is then purified and used as a starting material for preparing ammonia Use the following information to calculate Delta H degree in kilojoules forth the water. gas reaction: C(s) + O_2(g) rightarrow CO_2(g) Delta H degree = -393.5 kJ 2 CO(g) + O_2(g) rightarrow 2 CO_2(g) Delta H degree = -566.0 kJ 2 H_2(g) + O_2(g) rightarrow 2H_2O(g) Delta H degree = -483.6 kJ

Explanation / Answer

C(s) + O2(g) ------ CO2(g) , Delta H1 = -393.5 kJ

2CO(g) + O2(g) -------- 2CO2(g). Delta H2 = -566

Adding Reaction 1 and reverse of half of reaction 2 we get

C(s) + 0.5O2(g) ------- CO(g), Delta H(rxn) = -393.5 + 566/2 = -110.5 kJ

We have got the reaction, now the hack is that H2(g) and O2(g) are zero because they are present in their natural state, that is the hack in the problem we don't need the third equation so we can add 1/2O2 to the left and H2 to the right side

C(s) + O2(g) ------- CO(g) + H2(g), Delta H will be unchanged, hence the final answer is -110.5 kJ

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