Calculate the enthalpy of hydration of NazCO3 if 5.19 g of NazCO3 dissolves in water and gives out 2.033 kJ of heat (Q) and 18.9 g of Na2CO3 • 10H20 dissolves in water and absorbs 2.639 kJ of heat (Q). The molecular weight for NazCO3 is 105.99 g/mol, Na CO3 10H20 is 286.14 g/mol. Na2CO3 (s) + excess H20 2Na* (aq) CO (ag) AH1 + 10H,O AH2 AH3 + excess H2O Na2CO3 • 10H2O (s)

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Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.