50. Calculate the number of moles in a 10.0 g sample of NaOH. 23 23 a. 0.250 mole b. 1.66 x 10 mole c. 0.208 mole d. 4.00 x 10 moles e. 1.51 x 10 moles 51. Phosphorus trichloride can be made by the reaction: P(s) + 6Cl₂(g) → 4PCI(/) What is the maximum amount of phosphorus trichloride that can be formed if 10 molecules of Preact with 36 molecules of chlorine? a. 4 molecules b. 12 molecules c. 24 molecules d. 46 molecules e. 6 molecules 52. In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s) + 30₂(g) →→ 2PbO(s) +2SO₂(g) If 50.0 g of PbS reacts with 25.0 g of oxygen, how many grams of PbO will be formed? a. 69.9 g b. 163 g c. 116 g d. 93.2 g e. 46.6 g
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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