Q:

# What is the equation for Delta H?

A:

Enthalpy is expressed as Delta H, which is the amount of heat content used or released in a system at constant pressure. Delta H equals change in volume multiplied by the constant pressure of the system plus the change in internal energy.

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At constant pressure, the heat flow for the process is also equal to the change in enthalpy. Heat flow is expressed as "q." The relationship between Delta H and q can be determined based on whether the reaction is exothermic or endothermic. If the reaction absorbs heat from the surroundings, it is endothermic, and q is positive. If q is positive, then Delta H is also positive. If the reaction releases heat to its surroundings, it is exothermic, and q is negative. If q is negative, then Delta H is also negative.

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