If 200ml of tea at 90C is poured into a 150g glass cup initially at 20C, what will be the common final temperature of tea and the cup when equilibrium reached, assuming no heat flows to the surrounding. * O 77.89C 88.89C 80.84C O 75.44C

Q: 19) Calculate the amount of heat (in kJ) necessary to raise the temperature of 53.8 g benzene by…

A: Given,  The required amount of heat, when 53.8 g if benzene raise its temperature by 50.6°C is:  The…

Q: A student dissolves 12.5g of lithium chloride LiCl in 250.g of water in a well-insulated open cup.…

A:

Q: For the reaction CO(g)+H2O()→ CO2(g)+Hz(g) AH° = 2.80 kJ and AS° = 76.8 J/K The equilibrium constant…

A:

Q: A 33.0 g sample of quartz, which has a specific heat capacity of 0.730 J-g C, is dropped into an…

A: Since water is at higher temperature than quartz therefore heat is transferred from water to quartz…

Q: If a reaction occurs very slowly and is endothermic then it cannot be spontaneous. True or false?

A: Spontanious reaction means the ability of the reaction to procede to right right i.e. towards the…

Q: his question requires the use of the extracts from the tables of thermodynamic properties supplied.…

A: Specific enthalpy: Specific enthalpy is the enthalpy per unit mass of a system. Constant-pressure…

Q: Consider the reaction. 2Fe2O3⟶4Fe+3O2ΔH∘rxn=+824.2 kJ2Fe2O3⟶4Fe+3O2ΔHrxn°=+824.2 kJ a) The…

A: The heat change that occurs in the formation of any compound that amounts 1 mole is called enthalpy…

Q: Reaction 2 Initial temp (HCl) 26.7 celsius Initial temp (NaOH) Average initial temp Final…

A: Heat of reaction 2:

Q: 6. If you added a 10 gram metal piece at 100 °C to 100 mL of water at 0 °C or at 20°C, which…

A: According to heat transfer (Calometry) principle- heat is transferred from the body of higher…

Q: Question 62 ▼ Part C AG = Itranscript CH₁ (9) + 4F2 (9)→CF4 (9) + 4HF (9) Gibbs standard free-energy…

A: Gibbs standard free energy for reaction ∆G°rxn  is equal to difference between sum of product…

Q: A 2.50 g block of iron is heated to 355.5 °C then plunged into 50.0 g of water at 25.0 °C. What will…

A: qw = -qm mw × cw × (Tf - Ti) = - { mm × cm ×( Tf-Ti) } 50 × 4.184 × (Tf - 25 ) = - { 2.50 × 0.444 ×…

Q: For the reaction 2S02(g) + 02(g)→2S03(g) AH° = -197.8 kJ and AS° = -187.9 J/K The equilibrium…

A:

Q: Which of the following statements is TRUE? If a chemical reaction changes direction, then AH°rxn…

A: Thermodynamics is used to determine whether the reaction is energetically possible in the given…

Q: For the following reaction: C3H4(g) + 2 H2(g) → C3H8(g); AG' = -76.7 kJ/mol. Calculate the value of…

A: In the given question we have to calculate the change in free energy (∆G) of the following Reaction…

Q: Consider the following generic reaction: A+2B→C+3DA+2B→C+3D, with ΔH = 148 kJkJ . Determine the…

A: Answer:Properties that depend on the quantity of system are called as extensive properties. These…

Q: Consider a mixture of 75.00 g water at room temperature 23.0 0C and 25.0 g water at 95.0 0C.…

A:

Q: RE Revie Chemical energy is released or absorbed from reactions in various forms. The most easily…

A: Given, ∆H°f (A) = -249 Kj/mol (B) = -399 KJ/mol (C) = 201 KJ/mol (D) = -499 KJ/mol   Chemical…

Q: For the reaction CH4 (9) + H₂O(g) - 215 J/K CO(g) + 3H₂(g) → AH° = -206 kJ and AS⁰ The equilibrium…

A:

Q: The combustion of 2.295 g of propanol (C3H7OH) increases the temperature of a bomb calorimeter from…

A: Heat of Combustion- Is the measure of the amount of heat released when one mole of a substance is…

Q: The enthalpy change for a certain reaction is -209.4 kJ and the entropy change is 585.7 J/K.  What…

A:

Q: If there are two chemical reactions: #1 with change in Gibbs free energy of -25 kJ/mol; and #2 with…

A: #2 since it has a higher change in Gibbs free energy.

Q: Which one of the following is not a state function? enthalpy heat entropy O Gibbs free energy

A: State function is the variable which depends only on the initial and final state while it is…

Q: Change A chemical reaction between two liquids creates gaseous products. An exothermic chemical…

A: Spontaneity of the reaction can be decided on the basis of the value of Gibbs free energy change and…

Q: The enthalpy change for a certain reaction is -209.4 kJ and the entropy change is 585.7 J/K.  What…

A:

Q: For the reaction 4HCI(g) + 02(g)2H,0(g)+ 2C2(g) AH° = -114.4 kJ and AS° = -128.9 J/K The equilibrium…

A:

Q: 76. Consider the reaction: CO₂(g) + CCl4 (g) = 2 COC1₂ (g) Calculate AG for this reaction at 25 °C…

A: The change in Gibbs free energy is calculated using the following expression.…

Q: Exothermic Endothermic Honer than suroundings Heat Heat Cooler than sunoundinge Heal Neal Heal Heat…

A: We know that,  Entropy measure randomness. It means that, more randomness means more entropy as like…

Q: A sample of an ideal gas in a cylinder of volume 2.99 L at 298 K and 2.16 atm expands to 7.00 L by…

A: Based on the  given question, we can write,Path A and B can be represented as,Work done for path A…

Q: What is the relationship between the two? Which is more stable in terms of thermodynamics, why?

A: The given compounds are the isomers of decalin. The first compound is the trans decalin and The…

Q: The enthalpy of vaporization of ammonia is 23.35 kJ/mol at its boiling point (–33.4°C). Calculate…

A: Given: Enthalpy of vaporization of ammonia = 23.35 kJ/mol. Boiling point of ammonia = -33.4 oC And…

Q: A sample of an ideal gas in a cylinder of volume 4.01 L at 298 K and 2.02 atm expands to 7.08 L by…

A: For path A : P1=2.02 atm V1=4.01 L T1=T3=298 K V3=8.06

Q: What mass of silver is required to raise the temperature of silver from 156.0ºC  to 623ºC if 5012 J…

A: Formula used  Q = mCdT where Q = heat  m = mass , C = heat capacity dT = change in temperature

Q: Without doing any calculations, match the following thermodynamic properties with their appropriate…

A: ∆S universe=0  ∆Grxn.  negative at higher temperatures, positive at lower temperatures

Q: Read the descriptions of physical or chemical changes in the table below. Then decide whether the…

A: Spontaneity of the reaction can be decided on the basis of the value of Gibbs free energy change…

Q: 4. For a chemical reaction that has a AGº value of +275 kJ/mol, what value must Q have for this…

A: Since the relationship between Q and ΔG is as shown below ΔG = -RTln(Q)  where R = gas constant =…

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.