In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Since the cup itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter and the value determined is called the calorimeter constant. One way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 90.04 grams of nickel to 99.33 °C and then drops it into a cup containing 85.30 grams of water at 22.54 °C. She measures the final temperature to be 30.24 °C. Using the accepted value for the specific heat of nickel (See the References tool), calculate the calorimeter constant. Calorimeter Constant J/°C.

Q: Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 191. kJ during a…

A: The enthalpy change of the given reaction is = -191. kJ The work done by the gas mixture is =-63. kJ…

Q: Why is measuring temperature important in determining whether a change in enthalpy is exothermic or…

A: Exothermic reactions are the reaction where heat energy is evolved during the reaction. However,…

Q: Let's use our knowledge of constant volume (bomb) calorimetry to determine the heat energy in a…

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Q: 6. A 40.00 g sample of water at 22.00°C is put in a calorimeter. After 60.00 g of water at 65.00°C…

A: (6) Given - Mass of water at 22.00°C = 40.00 g  Mass of water at 65.00°C = 60.00 g  Final…

Q: Measurements show that the energy of a mixture of gaseous reactants increases by 175. kJ during a…

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Q: A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat…

A: Qcal + Qrxn + Qsol = 0 Qcal = Ccal (T2 - T1)   Qrxn = n Δ r Ho  Qsol = m Cp (T2 - T1) Given…

Q: Measurements show that the enthalpy of a mixture of gaseous reactants increases by 222. kJ during a…

A: The enthalpy change of the given reaction is = +222. kJ The work done by the gas mixture is =-167.…

Q: absorbed for a given chemical reaction… using Hess’ law for a net reaction from a  series of…

A: Example of Hess' law, If we find t heat of reaction of A + B ----> D + E + P If above chemical…

Q: of enthalpy

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Q: A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of…

A: Mass of sample = 0.526 g  Mass of water = 1050 g  Initial temperature = 25.10 degree C  Final…

Q: The heat capacity of an object indicates how much energy that object can absorb for a given increase…

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Q: A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of…

A: Given the enthalpy of combustion of 2-naphthylacetic acid = - 5779 kJ/mol mass of 2-naphthylacetic…

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.