Which of the following has an heat of formation equaling zero? A) H B) N C) O D) F2 E) None of the above

Q: It is found that absorption of 10 kJ of heat raises the temperature of a bomb calorimeter by 2.15…

A: Thermodynamics is branch of chemistry in which we deal with the heat absorbed and heat released by…

Q: Suppose that the molar enthalpy of a reaction is -73.45 kJ/mol and 4.222 moles are reacted. How many…

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Q: 3) what mass of mathane must be burned in erder to liberate 12,773 kJ of heat ? ()

A: NOTE : Since it is not clearly mentioned whether the heat released is 12.774 KJ or 12773 KJ, hence…

Q: What is a calorimeter constant? ) Amount of energy lost out of or absorbed by a calorimeter )…

A: In this question, we have to choose the correct option for the given question.

Q: Metal A has a heat capacity of 0.450 J/g°C while metal B has a heat capacity of 1.250 J/g° C. If…

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Q: Piece of metal with a mass of 48.342 g at an initial temp of 108 C is placed into 50 g of water…

A: Given, mass of metal =48.342 graminitial temperature of metal =108 °Cmass of water =50 graminitial…

Q: Consider the combustion reaction of methane shown below.   If 45.0 g of CH4 reacts completely, how…

A: Combustion reaction of methane(CH4) is given as:  CH4(g) + 2O2(g) -------> CO2(g) + 2H2O(l) For…

Q: How much heat is rel;eased to the surroundings when 5.00g of CO2 is produced according to the…

A: .reaction given in question states that 2220 kj energy released in production of 3 moles of CO2 .…

Q: A 1.69 gram sample is heated to an initial temperature of 75 oC. The sample is then placed in a…

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Q: How much heat is released by the formation of 18.0 g of CaCO,? Show the conversions required to…

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Q: Consider the combustion of liquid CH in oxygen gas to produce carbon dioxide gas and water vapor. In…

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Q: How much heat is rel;eased to the surroundings when 5.00 g of CO2 is produced according to the…

A: We can solve the problem by determining the moles of CO2 that is actually produced in the reaction.…

Q: What does "Enthalpy change of a chemical reaction" mean?

A: Enthalpy change of a chemical reaction is defined as the amount of heat released or absorbed in the…

Q: almonia, water, iron and gold which has highest specific heat capacity ?

A: Given information,           Ammonia          Water           Iron           Gold

Q: If a student used a sample of metal that was wet, several percent of the apparent mass of the metal…

A: Heat capacity is the amount of heat energy required by a substance to raise its temperature by 1oC.…

Q: Suppose the 25.0 g of the following substances all initially at 27.0 °C absorb 2.35 kJ of energy.…

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

Q: How much heat is evolved when 30.g of magnesium is burned in excess oxygen gas given thereaction…

A:

Q: An ideal gas in a cylinder fitted with a piston expands at constant temperature from a pressure of 9…

A: Given data : Temperature (T) = Constant Pressure (P) = 9 atm Volume(V) = 7.0 L to 17 LConsatnt…

Q: 2. When you mix two solutions one containing compound A and the other containing compound B in a…

A: Because the final temperature for the mixing of compound A and compound B  is increase tgen it is a…

Q: A chemist measures the energy change AH during the following reaction: 2 Fe₂O3(s)→ 4 FeO(s) + O₂(g)…

A: we have to calculate heat released or absorbed for the reaction of 67.5 g Fe2O3

Q: Give an example of a reaction that represents the heat of formation?

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Q: 7) How many joules are required to heat 75 grams of water from -85 °C to 85°C?

A: 7. Given,Mass of water = 75 gramsTemperature of water changes from - 85 °C to 85 °CRequired,…

Q: 6) Heat of formation values for four compounds are given in the table above. a) Calculate the heat…

A: First  we write  balanced  chemical equation

Q: What would be the final temperature if 50.0g of H2O at 30.0C was added to 40.0g of H2O at 90.0C?…

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Q: Write the chemical reaction used to determine the heat of formation for the following substance:…

A: The chemical reaction  used to determine the heat of formation of sodium bicarbonate is given as,

Q: here is the qeustion and the answer what you need to do is (you needed to describe what specific…

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Q: Heat (J) 1570 1570 Mass (g) 75.0 15.0 15.0 Heat Capacity (J/g °C) 4.18 (water) 4.18 (water) 0.921…

A: The heat gain or loss is the product of mass, specific heat,  and temperature changes.where,q is…

Q: Part C at A piece of metal weighing 5.50 g at a temperature of 47.8 °C was placed in a calorimeter…

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Q: How much heat is released when a 0.79 g magnesium ribbon is burned

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A: Given, System performs 213 KJ of work on its surrounding And system loses 79 KJ of heat in the…

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Q: 3. Sodium hydroxide gives off 44.5 kJ of heat per mol when dissolved in water. Write the balanced…

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Q: Suppose that the molar enthalpy of a reaction is -40.95 kJ/mol and 3.144 moles are reacted. How many…

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Q: Question  mentioned in the attachment

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Q: Calculate the total heat energy in joules needed to convert 20.0g of water from 30.0 c to -20.0c

A: q = mc∆T            m = mass  of water = 20.0 g             c = 4.184 J/g. oC…

Q: How much heat is released when 15.9 g of Al react with excess Fe2O3. Show the conversions required…

A: Answer:Al is more reactive metal than Fe, so when Al and Fe2 are made to react, Al reduces Fe2O3…

Q: A mixture of butane and oxygen gases are contained in a cylinder with a moveable piston lid. A spark…

A: Given, the gas expands and heat is released by the gas.

Q: Which element in the periodic table has a specific heat of 0.850

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Q: Write the chemical reaction used to determine the heats of formation for the following substance:…

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Q: Question 3 If you spill some of the hydrochloric acid on the table during the reaction of…

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Q: Exothermic Endothermic Heat Heat Heat Heat Which statement is correct? O When an endothermic process…

A: Endothermic process is a process which involves heat absorption from the surroundings, so as to…

Q: A gas expands against a constant external pressure and does 5 J of work on the surroundings. During…

A: Given,Work done on the surroundings = 5 JHeat absorb by gas = 10 JRequired,                The…

Q: Which of the following has an heat of formation equaling zero? A) H B) N C) O D) F₂ E) None of the…

A: The standard heat of formation of an element is equal to 0 when it is present in its elemental…

Q: In a coffee-cup calorimeter, 140.0 mL of 1.4 M NAOH and 140.0 mL of 1.4 M HCİ are mixed. Both…

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Q: Explain 2 reasons why the calculated value from the experimental data may differ from the…

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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.