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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Silicon, which occurs in nature as SiO2, is the material from which most computer chips are made. If SiO2 is heated until it melts into a liquid, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 52.8 kg of SiO2 reacts with 25.8 kg of carbon to produce 22.4 kg of silicon. Determine the amount of SiO2, carbon, silicon and carbon monoxide present after the reaction has taken place.
- this is what I figured out. I just need help finding the amount of SiO2, carbon, silicon and carbon monoxide present after the reaction has taken place.
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data given -
Mass of SiO2 = 52.8 Kg = 52800 g.
Mass of carbon = 25.8 Kg = 25800 g.
Actual yield of silicon = 22.4 Kg = 22400 g.
Molar mass of SiO2 = 60.085 g/mol
Molar mass of Carbon = 12g/mol
Molar mass of Si = 28.085 g/mol
amount of SiO2 = ?
amount of carbon = ?
amount ofsilicon = ?
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calculation -
the balanced equation
SiO2 + 2C → Si + 2CO
This means for 1 mole of SiO2 consumed, we need 2 moles of Carbon to produce 1 mole of Silicon and 2 moles of CO
Calculate moles of SiO2
Number of moles = mass of SiO2 / Molar mass of SiO2
Number of moles SiO2 = 52800 grams / 60.085 g/mol
Number of moles SiO2 = 878.75 moles
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Calculate moles of Carbon
Number of moles = mass of C / Molar mass of C
Number of moles C = 25800 grams / 12 g/mol
Number of moles C = 2150 moles
Calculate moles of silicon
Number of moles = mass of Si / Molar mass of Si
Number of moles Si = 22400grams / 28.085 g/mol
Number of moles Si = 797.58moles
- would this be my answer because I am stuck here.
- Possible answer: the amount of SiO2, carbon, silicon present after the reaction has taken place is 878.75 moles, 2150 moles and 797.58 moles.
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