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Calculate the standard enthalpy change for the formation of carbon dioxide (CO2) from its elements carbon (C) and oxygen (O2) given the following information:

- The standard enthalpy change for the combustion of carbon to form carbon dioxide is -394 kJ/mol.
- The standard enthalpy change for the combustion of hydrogen gas (H2) to form water (H2O) is -286 kJ/mol.
- The standard enthalpy change for the reaction of oxygen gas (O2) with hydrogen gas (H2) to form water (H2O) is -572 kJ/mol.

Note: All values are at standard temperature and pressure (298 K and 1 atm).
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Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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