The enthalpy of reaction is -238.62 Kj/ mol.
What is enthalpy of reaction?
Enthalpy is defined as sum the internal energy and pressure volume or change in enthalpy defined as amount of energy released or absorbed at constant pressure.
The enthalpy per mole of reactant is expressed in units of kj/mol.
(0.434 g of Na) × (1 mole Na / 22.990g) = 0.0189 mole
ΔH= -4.510kj /0.0189 mole = - 238.62 Kj/ mol
ΔH is negative because energy is released by the system.
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