Answer :
The change in the system's enthalpy equals the heat produced or absorbed by a chemical process occurring at constant pressure.
- Following is a summary of the link between the enthalpy of reaction and the change in the system's internal energy during a chemical reaction.
- Most chemical reactions take place at atmospheric pressure, which is constant, therefore the heat of reaction under constant pressure is known as enthalpy (H), as in H=U+PV.
- The enthalpy change is precisely equal to the heat transmitted to the system if the sole work performed is a change in volume at constant pressure.
- The temperature at a given volume is directly proportional to the pressure of a given quantity of gas. A system's pressure increases when its temperature rises and vice versa. The Gay-law Loussac's establishes the link between pressure and temperature of a gas.
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