Chem Lab Hess's Law

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7 Terms

1
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Hess’s Law

the enthalpy of reaction III should therefore be equal to the sum enthalpies of reactions I and II, or ΔH(I) + ΔH(II) = ΔH(III)

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objectives of the lab

 Experimentally see that Hess’s law is true

 Reinforce the use of the SPARKvue app and other PASCO equipment

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waste of the lab

sodium hydroxide solution from Part A should be collected for neutralization

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what is the equation to find the heat absorbed by water

𝑞𝐻2𝑂 = 𝑚 𝑐𝐻2𝑂 Δ𝑇

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𝑐𝐻2𝑂

4.179 (𝐽 /𝑔 °C)

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enthalpy

Δ𝐻𝑟𝑥𝑛 = −𝑞𝐻2O

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Δ𝐻𝑟𝑥𝑛/𝑚𝑜l

found by dividing Δ𝐻𝑟𝑥n by moles of NaOH