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Hess's law help please and thanks

We're given the first 2 equations and asked to find the enthalpy change of the 3rd.

This is what I came up with:

I don't know how to get rid of the 3/2 O2 and the 1/2 O2.
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joostan
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We're given the first 2 equations and asked to find the enthalpy change of the 3rd.

This is what I came up with:

I don't know how to get rid of the 3/2 O2 and the 1/2 O2.


Flip equation 2 and divide by 2:
SO3 --> SO2 + 1/2O2 = + 99.1 kJmol-1
See what you can do from here.

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