How many J of energy would you need in order to heat 252 grams of iron from 305 K to 445 K? S(Fe) = 0.450 J/g*K

Q: If the specific heat of iron is 0.449 Jg°C , how much iron is in your sample if 925 J were required…

A: Given, specific heat capacity of iron (CpIron) = 0.449 J/g°C  Amount energy required (Q) = 925 J…

Q: Charcoal is primarily carbon. Determine the mass of CO, produced by burning enough carbon (in the…

A: Charcoal burns in the air and reacts with O2 to produce CO gas, which further burns with more O2 to…

Q: You determine that 143 J of energy as heat is required to raise the temperature of 94.28 g of zinc…

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

Q: A chemist measures the energy change AH during the following reaction: 2 HgO(s) → 2 Hg(1)+O2(g) AH=…

A: Given reaction is, 2 HgO (s)  →  2 Hg (l) + O2 (g)                     ∆H = 182 kJ As,  ∆H is…

Q: The following thermochemical equation is for the reaction of carbon monoxide(g) with chlorine(g) to…

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Q: The change in the internal energy of a system (ΔE) is -74 J. What is the work done when the system…

A: We have to calculate the work done.

Q: Enthalpy is the energy absorbed or released when a chemical change occurs. Assume you have the…

A: Heat evolved when, 1 mole of the substance is completely burnt in presence of oxygen is known as…

Q: 2. What is the heat capacity of 25.0 g of ethyl alcohol if its specific heat is 2.42 J/g C?

A: Given is 25.0 g ethyl alcohol  Heat capacity  = Hc = 2.42 J/g°C Specific heat = ?

Q: Liquid hydrogen peroxide is an oxidizing agent in many rocket fuel mixtures because it releases…

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Q: 12. An aluminum kettle weighs 1.05 kg. (a) What is the heat capacity of the kettle? (b) How much…

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Q: For the following combustion reaction CH3COCH3(1) + 402(g) ->>> 3CO2(g) + 3H₂O(g) AH = -1.79 × 10³…

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Q: An unknown metal has a mass of 88.0 g. When 2440 J of Metal Specific heat (J/g • C) heat are added…

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Q: Consider the reaction of hydrogen with sulfur to form hydrogen sulfide: 8H₂ (g) + S8 (s) → 8H₂S(g),…

A: The difference in the enthalpy of the products and reactants is known as the enthalpy change of the…

Q: A propane BBQ combusts propane as shown below: C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (l)   ΔrH =…

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Q: 112. The thermochemical equation for the combustion of methanol is CH3OH (g) + 3/2 O2(g) → CO2(g)…

A: The chemical reaction of the combustion of methanol is CH3OH (g) + 3/2 O2(g) → CO2(g) + 2 H2O(l) ΔH…

Q: 4.A 10. g cube of copper at a temperature T₁ is placed in a calorimeter containing 10. g of water at…

A: When the copper cube is placed in the calorimeter containing water, heat will flow from the hotter…

Q: A coffee-cup calorimeter contains 150.0 g of water at 25.3 °C. A 124.0-g block of copper metal is…

A: Here we are required to find the heat gained by water and heat lost by copper.

Q: In the following reaction, how much heat (in kJ) is released when 5.81 moles of CH4 are burned? CH4…

A: The balanced Chemical equation is - CH4(g) + 2O2(g) -----> CO2(g)  + 2H2O(g)  (∆H° = -802 kJ/mol)…

Q: The energy change, q, for a system is given by the formula q=m * C * change T. C is the specific…

A: The change in energy of a system is given by,

Q: Exactly 385 J will raise the temperature of 76 g of a metal from 15.7oC to 50.9oC. What is the…

A: The given data: The mass of metal is 76 g The temperature of metal raises from 15.70C to 50.90C…

Q: The specific heat of toluene (C7H8), is 1.13 J/g•K. How many kJ of heat are necessary to raise the…

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Q: What mass of galena (PbS) is converted to lead (II) oxide if 200 kJ of heat are produced?

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Q: A piece of unknown substance weighs 44.7 g and requires 2110 J to increase its temperature from 23.2…

A: Specific heat: Specific heat can be defined as quantity of heat required to raise the temperature of…

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.