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Chemistry 101

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If the temperature of 34.4 $\mathrm{g}$ of ethanol increases from $25.0^{\circ} \mathrm{C}$ to $78.8^{\circ} \mathrm{C}$ , how much heat has been absorbed by the ethanol? Refer to Table $15.2 .$

Chapter 15

Energy and Chemical Change

Hello Today we'll be talking about Chapter 15 question for which asks us about a specific amount of ethanol. So 34 0.4 grams of ethanol that is heated from 2025 degrees Celsius. So it goes from 25.0 degrees Celsius all the way up to 78.8 degrees Celsius and were asked thio, calculate how much heat the ethanol has actually absorbed. How much heat is absorbed now? To do this, we have a an equation that relates the heat that a compound absorbs solution absorbs, which is equal to the mass of the solution times the specific heat of the solution and times the change in temperature. I like to think of this equation as M cat M C Delta T that reads kind of like M cat. So we can look up the specific heat of ethanol in a table in the textbook, on the Internet or wherever, and we find that the specific heat of ethanol is 2.44 jewels per gram degree Celsius of ethanol. And so putting this all together we can solve for Q. Given that we have our massive ethanol here, we have our temperature difference, which is 53.8 degrees Celsius, and we have our specific heat that we just looked up. So we have now 34 0.4 grams of ethanol. Times 2.44 jewels. Her Graham ethanol degrees Celsius times 53.8 degrees Celsius is air temperature difference. And indeed, our units will cancel the degrees Celsius as well the grams of ethanol. And we'll be left with an answer in jewels, which comes out to be 4.5 four point size two um, times 10 to the third Jules 4.52 times 10 to the third jewels of heat were absorbed by the ethanol. And so hopefully this gives you a little bit more of an understanding about howto apply this a quiche equation, which lets us relate. Heat gained two temperature change any given substance

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Numerade Educator

University of Kentucky

Brown University

Lectures

02:29

Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry deals with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds. Chemistry also involves understanding the properties and interactions of individual atoms and molecules for use in larger-scale applications.

04:42

In chemistry and physics, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic particles, and in everyday as well as scientific usage, "matter" generally includes atoms and anything made up of them, and any particles and objects that act as if they have both rest mass and volume. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or sound. Matter exists in various states (known as phases) that are defined by various physical properties, such as state of matter, phase, shape, and density. The Standard Model of particle physics and the general theory of relativity describe fundamental particles and the fundamental forces acting between them that control the structure and dynamics of matter.

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