When 0.617 g of sodium metal is added to an excess of hydrochloric acid, 6410 J of heat are produced. What is the enthalpy of the reaction as written? 2 Na(s) + 2 HCl(aq) Enthalpy of reaction: 2 NaCl(aq) + H₂(g) kJ

Q: A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains…

A:

Q: For the reaction, N2(g) + 2 O2(g) ➞ 2 NO2(g) , the enthalpy change is 33.9 kJ/mole of NO2 formed.…

A: Enthalpy is a thermodynamic property which is an extensive additive property we are required to find…

Q: A student performs a calorimetry experiment. The student combines 100. g of 0.40 M HC1(aq) with 100.…

A: Heat absorbed by the particular species = mass × heat capacity × temperature change

Q: Calculate the standard enthalpy for the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), given the…

A: Given: (1) N2(g) + O2(g) → 2NO(g); ΔHrxn = -43.1 kcal mol-1  (2) N2(g) + 3H2(g) → 2NH3(g); ΔHrxn =…

Q: Calculate the standard enthalpy for the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), given the…

A: Required equation: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) N2(g) + O2(g) → 2NO(g) ΔHrxn = -43.1 kcal…

Q: Calculate the heat change (q) in J when 8.111 grams of water is cooled from 1.472 ºC to -2.592 ºC.

A: The heat change during a temperature change ca be calculated as follows. q=mc∆Tq=heat…

Q: Methanol is known to be the simplest alcohol, and is used as  an antifreeze agent, a solvent, a…

A:

Q: What is the enthalpy change in kJ of a chemical reaction that raises the temperature of 250.0 mL of…

A: We have to calculate the enthalpy change

Q: When methanol, CH, OH, is burned in the presence of oxygen gas, O₂, a large amount of heat energy is…

A: One mole of methanol react with oxygen and produced one mole of carbon dioxide and two mole of water…

Q: When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter, the temperature rises…

A:

Q: The standard molar enthalpy of formation of diborane, B₂H₁ (g), cannot be determined directly…

A:

Q: What is the heat, q, in joules transferred by a chemical reaction to the reservoir of a calorimeter…

A: In order to find the amount of heat transferred we first write down the given data: Mass= 105 g. c=…

Q: A quantity of 50.0 mL of 0.200 M Ba(OH)2 is mixed with 50.0 mL of 0.400 M HNO3 in a…

A: The balanced chemical equation is written as, BaOH2aq+2HNO3aq→BaNO32aq+2H2Ol The required amount 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.