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Thermochemistry Formula Sheet

This thermochemistry formula sheet outlines key concepts including the first law of thermodynamics, internal energy, and heat capacities. It provides formulas for calculating heat transfer in various scenarios, such as calorimetry and phase changes, along with specific values for water's heat capacities. Additionally, it includes equations for determining final temperatures in mixtures and enthalpy changes in reactions.

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Kelvin Yeboah Tenkorang
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124 views1 page

Thermochemistry Formula Sheet

This thermochemistry formula sheet outlines key concepts including the first law of thermodynamics, internal energy, and heat capacities. It provides formulas for calculating heat transfer in various scenarios, such as calorimetry and phase changes, along with specific values for water's heat capacities. Additionally, it includes equations for determining final temperatures in mixtures and enthalpy changes in reactions.

Uploaded by

Kelvin Yeboah Tenkorang
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
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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