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A quantity of $85.0 \mathrm{mL}$ of $0.900 \mathrm{M} \mathrm{HCl}$ is mixed with $85.0 \mathrm{mL}$ of $0.900 \mathrm{M} \mathrm{KOH}$ in a constant-pressure calorimeter that has a heat capacity of $325 \mathrm{J} / \mathrm{C}$. If the initial temperatures of both solutions are the same at $18.24^{\circ} \mathrm{C},$ what is the final temperature of the mixed solution? The heat of neutralization is $-56.2 \mathrm{kJ} / \mathrm{mol} .$ Assume the density and specific heat of the solutions are the same as those for water.

$66.87^{\circ} \mathrm{C}$

Chemistry 101

Chapter 6

Thermochemistry

Carleton College

Rice University

University of Toronto

Lectures

05:27

In chemistry, a chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Both reactants and products are involved in the chemical reactions.

06:42

In chemistry, energy is what is required to bring about a chemical reaction. The total energy of a system is the sum of the potential energy of its constituent particles and the kinetic energy of these particles. Chemical energy, also called bond energy, is the potential energy stored in the chemical bonds of a substance. Chemical energy is released when a bond is broken during chemical reactions.

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Hey guys in this problem we will calculate the entropy change for the neutralization of hcl by N a O H. Let's do it. Then it's the solution Is equal to one g there cubic centimeter And volume of solution is equal to 100 plus 100 which is equal to 200 ml, which is equal to 200 cubic centimeters. A massive solution is equal to density of solution multiplied by volume of solution which is equal to one, multiplied by 200, which is equal to 2000 graham. Then energy absorbed by solution is equal to specific heat capacity of solution which is equal to 4.18. Multiplied by a massive solution, multiplied by temperature difference which is equal to Final temperature minus initial temperature which is equal to 6.7. Then energy is equal to 56, jewel. Multiplied by 10 to the power negative three. To convert it into a kilo jewel which is equal to 5.6 kilo drool. Then energy released by the reaction is equal to energy observed by the solution which is equal to 5.6 kg jewel. Then the number of moles of Hcl present in 100 ml of one molar hcl is equal to 100. Multiplied by 10 to the power negative three Multiplied by one which is equal to 0.1 more. This for H c O. A number of moods of Noh present and 100 million of one more N O h solution is equal to 100, multiplied by 10, 2 -2 to power negative three multiplied by one which is equal to 0.1. No Then number of moles of assets consumed in the experiment is equal to 0.1 mul and 5.6 kg joule of heat is released when 0.1 mol hcl neutralized. Hence, anthology change of neutralization is equal to 5.6 over 0.1 which is equal to 56 kilo jewel burma will since heat is evolved during the neutralization reaction, we have to use negative sign hence and thought we change of neutralization is equal to negative 56. Sorry, negative 56 kilo jule burma. Thanks for watching and see you in the next video.

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