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Thermochemistry Formula Sheet

This document is a thermochemistry formula sheet that outlines key equations related to the first law of thermodynamics, specific heat capacities, calorimetry, and enthalpy changes. It provides formulas for calculating heat transfer in various scenarios, including temperature changes and phase changes. Additionally, it includes specific heat capacity values for water and its phases, as well as the concept of final temperature in mixtures.

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yamimatoy501
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50 views1 page

Thermochemistry Formula Sheet

This document is a thermochemistry formula sheet that outlines key equations related to the first law of thermodynamics, specific heat capacities, calorimetry, and enthalpy changes. It provides formulas for calculating heat transfer in various scenarios, including temperature changes and phase changes. Additionally, it includes specific heat capacity values for water and its phases, as well as the concept of final temperature in mixtures.

Uploaded by

yamimatoy501
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Thermochemistry Formula Sheet:

1st Law of Thermodynamics: Internal Energy:

Endothermic: 𝑞 = + ∆𝑼 = 𝑞 + 𝑊
Exothermic: 𝑞 = −
Work Done By/On a Gas:
𝑾 = −𝑃∆𝑉
Work done by the system: 𝑊 = −
Work done on the system: 𝑊 = + 1 𝐿 ∗ 1 𝑎𝑡𝑚 = 101.3 𝐽𝑜𝑢𝑙𝑒𝑠

Specific Heat Capacity: 𝑱⁄(𝒈 ℃)


𝑞
𝑪𝑺 =
𝑚∆𝑇

Molar Heat Capacity: 𝑱⁄(𝒎𝒐𝒍 ℃)


𝑞
𝑪𝑴 =
𝑛∆𝑇

Heat Capacity: 𝑱⁄℃


𝑞
𝑪𝑯 =
∆𝑇

Calorimetry – Temperature Change:


𝒒 = 𝑚𝑐∆𝑇

𝐽 𝐽 𝐽
𝐶𝐻2𝑂 = 4.184 𝐶𝐼𝑐𝑒 = 2.09 𝐶𝑆𝑡𝑒𝑎𝑚 = 2.03
𝑔℃ 𝑔℃ 𝑔℃
Calorimetry – Phase Change:
𝒒 = 𝑚∆𝐻 𝒒 = 𝑛∆𝐻

H2O: ∆𝐻𝑓𝑢𝑠 = 334 𝐽⁄𝑔 ∆𝐻𝑓𝑢𝑠 = 6.01 𝑘𝐽⁄𝑚𝑜𝑙


H2O: ∆𝐻𝑣𝑎𝑝 = 2260 𝐽⁄𝑔 ∆𝐻𝑣𝑎𝑝 = 40.7 𝑘𝐽⁄𝑚𝑜𝑙
Final Temperature of a Mixture:
−𝑞𝐴 = 𝑞𝐵
TA → Initial Temp. of Substance A
TB → Initial Temp. of Substance B −𝑚𝐴 𝐶𝐴 (𝑇𝐹 − 𝑇𝐴 ) = 𝑚𝐵 𝐶𝐵 (𝑇𝐹 − 𝑇𝐵 )

Note: This equation will work if there are no phase changes.


Coffee Cup Calorimeter:
𝑞𝑟𝑥𝑛
∆𝑯𝒐 𝒓𝒙𝒏 = 𝑞𝑟𝑥𝑛 = −𝑞𝐻2𝑂
𝑛
Enthalpy Change:
∆𝑯𝒐 𝒓𝒙𝒏 = ∑ 𝑛 𝐻 𝑜𝑓 (𝑝𝑟𝑜𝑑𝑢𝑐𝑡𝑠) − ∑ 𝑛 𝐻 𝑜𝑓 (𝑟𝑒𝑎𝑐𝑡𝑎𝑛𝑡𝑠)

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