This is part of a continuing problem with the previous carbohydrate sample. Use the previous data in this part. 1) A 12.915 g carbohydrate sample composed of CHO was analyzed by combustion analysis from which was obtained 18.942 g CO2 and 7,74 g H2O. The molar mass of the sample was found to be 455.32 g/mole by independent analysis. How many repeat units are in this molecule? Input the numeric value here. Hint: This is a whole number value. Hint: The repeat units are determined by the ratio of the empirical formula molar mass to the molar mass of the sample; the empirical formula is determined by the ratio of moles of the compound's elements. 2) What is the molecular formula? Include this for your notes for personal practice. Table molar mass (g/mol): C 12.00, O 16,00, H 1,008.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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