Ethylene bromide is formed when the reaction takes place between ethylene and hydrogen bromide. Enthalpy change will be -59kJ/mol.
Enthalpy is a property of a thermodynamic system. It is as state function and can be defined as sum of internal energy and the product of pressure and volume.
H = E + PV
Its unit is joules. Heat is a form of energy, whereas enthalpy measures the amount of heat transferred during a chemical reaction at constant pressure. This is the primary difference between enthalpy and heat.
Another important difference between heat and enthalpy is that heat is not a state function while enthalpy is a state function. When ethylene is reacted with hydrogen bromide , ethylene bromide is formed and the enthalpy change during the reaction will be -59kJ/mol
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