Solution
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Step 1
Required: Heat of formation of carbon monoxide.
Step 2
Write out given information.
Equation 1:
(
= -393 kJ)
Equation 2:
(
= -570 kJ)
Step 3
Rearrange
Equation 1
(
1):
(
= -393 kJ)
Equation 2
(Reverse and divide by 2):
(
= +285 kJ)
(
= -108 kJ
)