Please explain in great detail (step by step). Co (g) can be produced by the rea

Question

Please explain in great detail (step by step). Co (g) can be produced by the reaction of coal with steam, as shown by the balanced equation H_2O (g) + C (s) rightarrow CO (g) + H_2 (g). Which of the following options correctly reflect the steps required to calculate Delta H for this reaction, given the information shown below? Select all that apply. Reaction 1: H_2 (g) + 1/2 O_2 (g) rightarrow H_2O (g); Delta H = -242.0 kJ Reaction 2: 2CO (g) rightarrow 2C (s) + O_2 (g); Delta H = +221.0 kJ Delta H = -131.5 kJ Delta H = -21 kJ Reaction 1 must be divided by 2. Reaction 2 must be reversed and divided by 2. Delta H = +131.5 kJ

Explanation / Answer

H2O (g) + C (s)   ----> CO (g) + H2 (g)
can be obtained by
-reaction1 - (1/2)* reaction2
H = -H1 - (1/2)*H2
= - (-242.0 KJ) - (1/2)*(+221.0)
= +131.5 KJ

Answer:
Reaction 2 must be reversed and divided by 2
H = +131.5 KJ

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