Element R has a molecular weight of 72.00 Element A has a molecular weight of 22.00 Given the reaction 2R + 3A = R2A3 If we start with 230 grams of R and 100 grams of A (READ CAREFULLY it is 230 g R and 100 g A!!!) How many moles of R2A3 can we theoretically make? What is the limiting reactant? If we actually make 0.40 moles of R2A3 what was our yield?
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.
Given for this problem:
Element R has a molecular weight of 72.00 Note!! Element R is not a real element.
Element A has a molecular weight of 22.00 Note!! Element A is not a real element.
Given the reaction 2R + 3A = R2A3
q = mass X specific heat X (Tfinal - Tinitial)
specific heat of water is 4.184 J/g oC
% Yield = (actual/theoretical) X 100
Given this hypothetical activity series:
Li > Na > Mg > A > Al > Zn > H > Cu > R > Ag > Pt
Element R has a molecular weight of 72.00
Element A has a molecular weight of 22.00
Given the reaction 2R + 3A = R2A3
If we start with 230 grams of R and 100 grams of A (READ CAREFULLY it is 230 g R and 100 g A!!!)
How many moles of R2A3 can we theoretically make? What is the limiting reactant? If we actually make 0.40 moles of R2A3 what was our yield?
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