Calculate the standard enthalpy change for the following reaction at 25 °C.

H2O+C(graphite)(s) --> H2(g) +CO(g)

To calculate the standard enthalpy change (ΔH) for a reaction, you need to use Hess's Law or look up the values of the standard enthalpies of formation (ΔHf) of the reactants and products involved in the reaction. Here is the step-by-step process to calculate the standard enthalpy change for the given reaction:

1. Write down the balanced equation for the reaction:
H2O + C(graphite)(s) → H2(g) + CO(g)

2. Look up the standard enthalpies of formation (ΔHf) for each of the reactants and products. The standard enthalpy of formation is the change in enthalpy when one mole of a substance is formed from its constituent elements in their standard states at a given temperature (in this case, 25 °C or 298 K). The standard enthalpies of formation can be found in reference books or online databases.

3. Calculate the overall change in enthalpy (∆H) for the reaction using the formula:
ΔH = Σ(νΔHf(products)) - Σ(νΔHf(reactants))
where ν is the stoichiometric coefficient of each species in the balanced equation.

4. Substitute the stoichiometric coefficients and the corresponding standard enthalpies of formation into the equation. The stoichiometric coefficients represent the number of moles of each species involved in the reaction.

5. Calculate the overall change in enthalpy (∆H) using the given values, and express the result in the appropriate units (usually kilojoules per mole, kJ/mol) to represent the standard enthalpy change for the reaction at 25 °C.

Note: Make sure to use consistent units for the stoichiometric coefficients and the standard enthalpies of formation.

After following these steps, you should be able to calculate the standard enthalpy change for the given reaction at 25 °C by substituting the values into the equation and performing the necessary calculations.

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