A balloon contains 313 g He at pressure of 1.00 atm. The volume of the balloon is 1910 L. The temperature is decreased by 15 ℃ and the volume is decreased to 1814 L. Assuming a constant pressure of 1.0 atm, calculate q, w, and ΔE for the helium in the balloon. (The molar heat capacity of helium gas is 20.8 J / ℃ ???

Q: A 40.0 g sample of an unknown metal at 99.0 °C was placed in a constant-pressure calorimeter…

A: According to thermodynamics, the heat released by the hot metal equals the heat absorbed by the…

Q: A 2.821 g sample of a new organic material is combusted in a bomb calorimeter. The temperature of…

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Q: A 49.12 g rock is heated to 97.2°C and placed into 72.91 g of water originally at 32.0 °C. If the…

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Q: If a 75 gram piece of copper is heated to 100.0oC and then put into a vessel containing 250.0 mL of…

A: Specific heat capacity of a substance is the amount of heat required to raise the temperature of 1 g…

Q: 2.For a certain process, q and w are both negative. Which description below best describes what…

A: We know that: ∆E = q+w ( First Law of Thermodynamics) W = -pext ∆V

Q: If a 53.1 gram piece of copper is heated to 100.0oC and then put into a vessel containing 250.0 mL…

A: Use principal of calorimetry  Heat flow from high temperature to low temperature Q= mc∆T

Q: 148 g sample of solid LiI-3H₂O (s) is dissolved in 212 mL of water in a coffee cup calorimeter. Once…

A: Givenmass of LiI.3H2O = 148 g Volume of water = 212 mL Final temperature= 18.69°C We have to find…

Q: Consider a balloon filled with 2115 L of helium at 1.00 atm pressure and 45.5°C. The temperature of…

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Q: A 60.0g piece of Zn at 20.0 degrees celsius is dropped into 200.0g of water at 100.0 degrees…

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Q: Energy change is the sum of heat and work:  ΔE = q + w.  Work is calculated by: w = -PΔV What is…

A: Given, a reaction absorbs heat =40.3 J =+40.3 J and volume of gas increases from 0.250 L to 0.750…

Q: A researcher studying the nutritional value of a new candy places a 4.10 g sample of the candy…

A: GIVEN: Mass of sample=4.10 g Temperature imcrease= 2.50oC Heat capacity of calorimeter=33.80 kJ K-1

Q: If a 68 gram piece of copper is heated to 100.0oC and then put into a vessel containing 250.0 mL of…

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Q: If a 74.6 gram piece of copper is heated to 100.0oC and then put into a vessel containing 250.0 mL…

A:

Q: The specific heat capacity of a pure substance can be found by dividing the heat needed to change…

A: Given - Heat capacity of the substance = 4.78Jg.°C            Mass of the substance = 189 g…

Q: When 1.550 g of a particular flammable liquid is burned in a bomb calorimeter, the temperature rises…

A: We have to calculate the value of ∆Erxn

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: A 50.1 g sample of glass is put into a calorimeter (see sketch at right) that contains 300.0 g of…

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Q: Consider the following reaction: 2C6H6() + 15 O2(g)- 12 CO2(g) + 6 H20() AH = -5.869 x 103 kJ An…

A: Each reaction takes place account to their stoichiometric radio and account to those things the heat…

Q: 3. In a bomb calorimeter, 0.562 g of graphite is kept in excess oxygen at 298 k. During the…

A: Answer:When graphite is burned in excess of oxygen it forms CO2 and huge amount of energy gets…

Q: One tablespoon of cookie dough has a mass of 13.02 g13.02 g. It is combusted in a calorimeter whose…

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Q: 2. A sample of lithium goes through a temperature change of +56.36 K while absorbing 17776 joules of…

A: Amount of heat,Q required to increase the temperature of a substance of mass ,m and specific heat…

Q: A sample of aluminum with a mass of 53.4 g is initially at 156 ∘∘ What is the temperature of the…

A: Specific heat (C) :-  The amount of heat required to raise the temperature of 1 gram of a substance…

Q: 6. When a 1.0 g sample of acetylene was burned in a bomb calorimeter, the temperature increased by…

A: The number of moles of acetylene is calculated as shown below where m is the given mass of acetylene…

Q: 49.85 grams of solid silver carbonate is dissolved in the calorimeter and the temperature goes from…

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Q: If a 68 gram piece of copper is heated to 100.0oC and then put into a vessel containing 250.0 mL of…

A: This question is based on principal of calorimetry. Heat released by Cu will  equal to heat gain by…

Q: A balloon filled with 39.1 mole of helium has a volume of 876 L at 0.0°C and 1.00 atm pressure. The…

A: given: no of moles= 39.1 mole initial vol=876L…

Q: 073 mol sample of an organic compound was burned in oxygen in a bomb eter. The temperature of the…

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Q: A 2.62E1 g sample of aluminum at 1.008E2 °C is added to 1.002E2 g of water at 2.22E1 °C in a…

A: For a chemical reaction or physical process to occur a certain amount of energy should be furnished…

Q: As a system increases in volume, it absorbs 50.33 of energy in the form of heat from the…

A: The internal energy of the system can be modified by doing work on them or by adding heat to the…

Q: If a 67 gram piece of copper is heated to 100.0oC and then put into a vessel containing 250.0 mL of…

A: The final temperature of water when hot copper placed in a cold water is to be determined from the…

Q: If a 61.5 gram piece of copper is heated to 100.0oC and then put into a vessel containing 250.0 mL…

A: Heat capacity: The amount of heat required to increase the temperature of one gram of a substance by…

Q: If a 57.7 gram piece of copper is heated to 100.0oC and then put into a vessel containing 250.0 mL…

A: We know that, according to the law of conservation of heat energy, energy gained or loss by the…

Q: A chemist measures the energy change AH during the following reactic 2 Fe,03(s) → 4 FeO(s)+O½(g)…

A: if ∆H is positive it means heat is absorbed then the reaction will be endothermic.

Q: Calculate the heat capacity of Al in J/mol °C.

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Q: 10.00 mL of 1.00 M HCl solution i mperature rises from 22.45 °C to 23 same as that of 125 g of…

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Q: A 307-g sample of an unknown mineral was heated to 98/1°C and placed into a calorimeter containing…

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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.