A number of reactions can be used to generate common gases on a laboratory scale. For example, nitrogen can be produced from sodium metal and potassium nitrate as indicated by the balanced equation: 10Na(s)+2KNO3(s)=K2O(s)+5Na2O(s)+N2(g) A common laboratory-scale reaction can also generate oxygen gas by heating potassium chlorate, as indicated by the balanced equation: 2KClO3(s)=2KCl(s)+3O2(g) What mass of potassium nitrate is needed to generate 195.0 L of gas, composed of 125.0 L of N2 and 70.0 L of O2 at 0.720 atm and 299 K, using these two reactions? What mass of potassium chlorate is needed to generate 195.0 L of gas, composed of 125.0 L of N2 and 70.0 L of O2 at 0.720 atm and 299 K, using these two reactions?
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.
A number of reactions can be used to generate common gases on a laboratory scale. For example, nitrogen can be produced from sodium metal and potassium nitrate as indicated by the balanced equation:
10Na(s)+2KNO3(s)=K2O(s)+5Na2O(s)+N2(g)
A common laboratory-scale reaction can also generate oxygen gas by heating potassium chlorate, as indicated by the balanced equation:
2KClO3(s)=2KCl(s)+3O2(g)
What mass of potassium nitrate is needed to generate 195.0 L of gas, composed of 125.0 L of N2 and 70.0 L of O2 at 0.720 atm and 299 K, using these two reactions?
What mass of potassium chlorate is needed to generate 195.0 L of gas, composed of 125.0 L of N2 and 70.0 L of O2 at 0.720 atm and 299 K, using these two reactions?
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