A sample of baking soda, NaHCO3, is decomposed while releasing steam and carbon dioxide gas as follows: 2NaHCO3(s)___> Na2CO3(s)+H2O(g)+CO2(g) Fill in the missing data in table 1 and use the equation (below) to determine the theoretical yield (Th. Yield) of sodium carbonate (Na2CO3) : Eqn (1) Th. Yield = Mass of NaHCO3 X 1 mol NaHCO3/ Molar Mass of NaHCO3X 1 mol Na2CO3/ 2 mol NaHCO3 X molar mass of Na2CO3/ 1 mol Na2CO3 1. Mass of test tube + NaHCO3 17.838 g 2. Mass of test tube 16.338 g 3. Mass of test tube + Na2CO3 17.293 g 4. Mass of NaHCO3 (Step 1 - Step 2) 5. Mass of Na2CO3 (Step 3 - Step 2) 6. Calculated Theoretical yield (Th. Yield) of Na2CO3(Use eqn. 1 above)
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 sample of baking soda, NaHCO3, is decomposed while releasing steam and carbon dioxide gas as follows:
2NaHCO3(s)___> Na2CO3(s)+H2O(g)+CO2(g)
Fill in the missing data in table 1 and use the equation (below) to determine the theoretical yield (Th. Yield) of sodium carbonate (Na2CO3) :
Eqn (1)
Th. Yield = Mass of NaHCO3 X 1 mol NaHCO3/ Molar Mass of NaHCO3X 1 mol Na2CO3/ 2 mol NaHCO3 X molar mass of Na2CO3/ 1 mol Na2CO3
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1. Mass of test tube + NaHCO3 |
17.838 g |
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2. Mass of test tube |
16.338 g |
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3. Mass of test tube + Na2CO3 |
17.293 g |
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4. Mass of NaHCO3 (Step 1 - Step 2) |
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5. Mass of Na2CO3 (Step 3 - Step 2) |
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6. Calculated Theoretical yield (Th. Yield) of Na2CO3(Use eqn. 1 above) |
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