The combustion of 0.4196 g of a hydrocarbon releases 17.55 kJ of heat. The masses of the products formed, viz. CO2 and H2O are 1.419 g and 0.290 g, respectively. Calculate the empirical formula of the hydrocarbon and its standard enthalpy of formation assuming that its molar mass is 78 g.

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UV Visible Spectroscopy

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.