Silicon nitride (Si3N4) is a desirable ceramic material that withstands high temperatures. Si3N4 can be produced by reacting silicon tetrachloride (SiCl4) with ammonia (NH3). In addition to Si3N4, hydrogen chloride (HCl) is produced in this reaction. There are no other reactants or products. (Molecular masses: Si3N4 = 140.31 g/mol, SiCl4 = 169.7 g/mol, NH3 = 17.03 g/mol) a. Please write a balanced equation for this reaction. ______________________________________________ b. If 128.0 g of SiCl4 is reacted with 10.2 g of NH3, which of these two compounds is the limiting reactant for the production of Si3N4? _______________ c. How much excess reagent (in grams) is left? ______________
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.
Silicon nitride (Si3N4) is a desirable ceramic material that withstands high
temperatures. Si3N4 can be produced by reacting silicon tetrachloride (SiCl4) with
ammonia (NH3). In addition to Si3N4, hydrogen chloride (HCl) is produced in this
reaction. There are no other reactants or products.
(Molecular masses: Si3N4 = 140.31 g/mol, SiCl4 = 169.7 g/mol, NH3 = 17.03 g/mol)
a. Please write a balanced equation for this reaction.
______________________________________________
b. If 128.0 g of SiCl4 is reacted with 10.2 g of NH3, which of these two
compounds is the limiting reactant for the production of Si3N4?
_______________
c. How much excess reagent (in grams) is left? ______________
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