The density of all solutions are 1.0g/mL and their respective heat capacities 4.184J/g.K. NH4OH(aq)+ HCl(aq)--> NH4Cl(aq)+H2O(l) Volume of 2.0 M HCl 25.0mL NUmber of moles of HCl ? Temperature of HCl 15oC Volume of 2.0 M NH4OH 25.0 mL Number of moles of NH4OH ? Temperature of NH4OH 15oC Intitial Temperature 15oC Final Temperature 23.5oC Change in Temperature ? Calculate qr in J (qr=-qsol) using qr=-mC(change in temperature). What is the enthalpy change ( Delta H) in kJ.mol-1, when 1 mole of acid is neutralized? delta H=qr/nHCl
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.
The density of all solutions are 1.0g/mL and their respective heat capacities 4.184J/g.K.
NH4OH(aq)+ HCl(aq)--> NH4Cl(aq)+H2O(l)
| Volume of 2.0 M HCl | 25.0mL |
| NUmber of moles of HCl | ? |
| Temperature of HCl | 15oC |
| Volume of 2.0 M NH4OH | 25.0 mL |
| Number of moles of NH4OH | ? |
| Temperature of NH4OH | 15oC |
| Intitial Temperature | 15oC |
| Final Temperature | 23.5oC |
| Change in Temperature | ? |
Calculate qr in J (qr=-qsol) using qr=-mC(change in temperature).
What is the enthalpy change ( Delta H) in kJ.mol-1, when 1 mole of acid is neutralized? delta H=qr/nHCl
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