# Problem: Hesss law provides a useful means of calculating energy changes that are difficult to measure directly. For instance, it is impossible to measure directly the enthalpy for the combustion of carbon to form carbon monoxide. Combustion of 1 mol of carbon with 0.5 mol of O2 produces both CO and CO2, leaving some carbon unreacted. However, solid carbon and carbon monoxide can both be completely burned in O2 to produce CO2.We can therefore use the enthalpy changes of these reactions to calculate the heat of combustion of carbon.What effect does this change have on Delta{ m H}: multiplying the coefficients of the equation for the reaction by 2?

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We are asked what effect does multiplying the coefficients of the equation for the reaction by 2 have on ΔH.

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Hesss law provides a useful means of calculating energy changes that are difficult to measure directly. For instance, it is impossible to measure directly the enthalpy for the combustion of carbon to form carbon monoxide. Combustion of 1 mol of carbon with 0.5 mol of O2 produces both CO and CO2, leaving some carbon unreacted. However, solid carbon and carbon monoxide can both be completely burned in O2 to produce CO2.We can therefore use the enthalpy changes of these reactions to calculate the heat of combustion of carbon.

What effect does this change have on : multiplying the coefficients of the equation for the reaction by 2?

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