Syngas is a mixture of carbon monoxide and hydrogen formed by the reaction of wa

Question

Syngas is a mixture of carbon monoxide and hydrogen formed by the reaction of water vapor with methane. This reaction is endothermic by 206.13 kJ/mol. The combustion of methane to frm carbon dioxide and water vapor is exothermic by 802.35 kJ/mol. Which of the following statements about the combusion of syngas must be true?

A) The standard enthalpy of formation of carbon monoxide is more esothermic than the sum of the standard enthalpies of formation of methane and water.

B) The combustion of syngas is endothermic.

C) The enthalpy of combustion of methane is postive.

D) The combustion of syngas is more exothermic than that of methane.

E) The standard enthalpy of formation of syngas is positive

PLEASE EXPLAIN WHY! THANKS!

Explanation / Answer

E) The standard enthalpy of formation of syngas is positive

The reason is very simple when a reaction is endo thermic (heat absorbing) the enthalpy of the system is positive

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