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Calculate the standard enthalpy of forma...

Calculate the standard enthalpy of formation of `SO_3` at 298 K using the following reactions and enthalpies.
`S_(8)(s) + 8O_2(g) to 8SO_2(g), DeltaH^(@) = -2775 kJ mol^(-1)`
`2SO_(2)(g) + O_(2)(g) to 2SO_(3)(g), Delta H^(@) = - 198 kJ mol^(-1)`.

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Verified by Experts

The correct Answer is:
`-445.9 kJ mol^(-1)`
Aim `: (1)/(8) S_(8)(s) + (3)/(2) (g) rarr SO_(3) ,DeltaH = ?`
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