Lead metal is obtained from lead sulfide through the following reaction : 2PBS(s) + 2C(s) + 302 (g) →2PB(s) + 2C0(g) + 25o2 (g)z a) If 100g Of PbS is reacted with excess C and O2, calculate the mass of lead metal obtained. b) Suppose 100g of PbS is reacted with 4g of C and 20g O2. Find the limiting reactant for this reaction. c) For question (b) above, calculate the mass of lead metal obtained. d) By referring to the question (c) above, If 31.2g Pb is obtained as the yield. Calculate the percentage of yield. e) Calculate mass of oxygen is needed to produce 500g of lead metal.
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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