Calculate the change in energy if q= .761kJ and w= -840J

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: What is the change in internal energy for a system if the system absorbs 537 kJ of heat and does…

A:

Q: A gas expands and does PV work on the surroundings equal to 325 J. At the same time, it absorbs 127…

A: Given  Work done by the system on surrounding = 325 Joule  Heat absorbed = 127 Joule  Change in…

Q: When 1 mole of Fe(s) reacts with HCI(aq) to form FeCl(s) and H2(g) according to the following…

A: Question belong to in Thermodynamics.  In this chemical reaction in the formation of product energy…

Q: A chemist measures the enthalpy change AH during the following reaction: 2 HNO,) + Mg(s)→Mg…

A: Given thermodynamical Chemical equation is - 2HNO3(l) + Mg(s) -----> Mg(NO3)2(s) + H2(g)     ∆H =…

Q: A chemist measures the energy change AH during the following reaction: Cl,(g)+H,(g) → 2 HCl(g)…

A: Exothermic reactions are those in which energy is released.

Q: Calculate DE, and determine whether the process is endothermic or exothermic for the following…

A: Given  (a) Absorb heat by the system = 334 KJ       Work done on the system   = 147 KJ       ∆E = ?…

Q: A scientist measures the standard enthalpy change for the following reaction to be -820.7 kJ…

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Q: A gas is confined to a cylinder under constant atmospheric pressure. When 0.49 kJ of heat is added…

A: According to the first law of thermodynamics, the internal energy change of the system is equal to…

Q: The work done to compress a gas is 74 J. As a result, 26 J of heat is given off to the surroundings.…

A: Given ; energy added by work = 74 J              Energy given to surrounding = 26 J

Q: A chemist measures the energy change AH during the following reaction: C;Hg(9)+50,(9) → 3…

A: Answer: exothermic If heat of Reaction (∆H = negative value) then it is said to be heat released and…

Q: A scientist measures the standard enthalpy change for the following reaction to be -661.2 kJ : ...…

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Q: A chemist measures the energy change AH during the following reaction: CH,(9)+20,(9) →…

A: Exothermic reactions are those in which energy is released in the form of heat. And the standard…

Q: The units for s, the specific heat of the water in the calorimeter, are J/(gK) The units for ΔT can…

A: The specific heat capacity of the water can be defined as the heat required to raise the temperature…

Q: What is enthalpy change for a reaction and how does this differ from the experimental heat flow…

A: Definition~ Enthalpy is the measurement of energy in a thermodynamic system. The quantity of…

Q: A system gains 612 kJ of heat, resulting in a change in internal energy of the system equal to +181…

A: Given,Heat gain (Q)=612kJChange in internal energy(∆U)=181kJ

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 412.0 mg sample…

A: The molar heat capacity of a compound is defined as the amount of heat required to raise the…

Q: A system releases 50 kJ of heat while having 25 kJ of work done on it.The change in energy ΔE is?

A: According to the First law of Thermodynamics: where ∆E is the change in the Internal Energy of the…

Q: 4. Methane burns in air to form carbon dioxide and water according to the following equation: CH +…

A: 1) When ΔH < 0, the reaction is Exothermic. When ΔH > 0, the reaction is Endothermic. 2)In…

Q: N2+2O2=2NO2 the reaction absorbs 66.2 kJ of heat per 2 mol NO2 produced. What is the value of q?

A: Heat of formation is definined  as the enthalpy change when one mole of compound is formed the…

Q: Write the balanced chemical equation for the combustion of methane, CH,(g), to give carbon dioxide…

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Q: A scientist measures the standard enthalpy change for the following reaction to be-138.9 kJ: H;(2) +…

A: The standard enthalpy change of a system represents the heat content of a system or the heat…

Q: The standard molar enthalpy of formation for oxygen gas, O2(g), is zero. The enthalpy of formation…

A: Molar enthalpy of formation of a substance is the energy required or released when one mole of a…

Q: The heat of combustion of propan-2-ol at 298.15 K, determined in a bomb calorimeter, is -33.41kJ/g.…

A: Heat of combustion is -33.41 kJ/g. We need to convert this per gram to mole.  The data required is…

Q: A chemist measures the energy change AH during the following reaction: C;Hg(9)+50,(g) → 3…

A: Exothermic reaction : If in any reaction,ΔH comes out to be negative, then the reaction is said to…

Q: A chemist measures the energy change AH during the following reaction: Cl(g)+H2(g) → 2 HCl(g)…

A: Given reaction: Cl2 (g) + H2 (g) → 2HCl (g)     ∆H = -184. kJ We have to find whether this reaction…

Q: A gas is compressed at constant temperature from a volume of 8.45 L to a volume of 2.17 liters by an…

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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.