Given #2CO(g) + O_2(g) rarr 2CO_2(g)# #DeltaH^@=-564*kJ*mol^-1#...what is the enthalpy associated with the formation of a mass of #44.0*g# of carbon dioxide by these means?

1 Answer
anor277
Jan 9, 2017

#DeltaH^@=-282*kJ#

Explanation:

#"2CO +O"_2rarr"2CO"_2# #;DeltaH^@=-564*kJ*mol^-1#

#DeltaH^@# is always quoted per mole of reaction as written. That is synthesis of 2 moles of carbon dioxide from 2 moles of carbon monoxide and stoichiometric dioxygen has an associated enthalpy change of #-564*kJ#. Because we combusted 1 mole of carbon monoxide, rather than 2 moles as specified in the equation, the enthalpy calculation is modified and HALVED.........

Related questions
See all questions in Energy Change in Reactions
Impact of this question
2508 views around the world
You can reuse this answer
Creative Commons License