From the enthalpies of reactionH21g2 + F21g2¡ 2 HF1g2 ΔH = -537 kJC1s2 + 2 F21g2¡ CF41g2 ΔH = -680 kJ2 C1s2 + 2 H21g2¡ C2H41g2 ΔH = +52.3 kJcalculate ΔH for the reaction of ethylene with F2:C2H41g2 + 6 F21g2¡ 2 CF41g2 + 4 HF1g2

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Photochemistry

Photochemistry is the part of chemistry that studies the various mechanisms of reactions that are triggered by the presence of light energy. It also helps to study the changes involved in a molecule that can undergo the absorption of radiation.