Home > Chemistry > Energy Change in Reactions

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

Answer 1

#DeltaH^@=-282*kJ#

#"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.........

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Ellie Andrews

The enthalpy associated with the formation of a mass of 44.0 g of carbon dioxide is -564 kJ/mol.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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?

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