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.........

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