Alkali metals are often used to remove traces of water from organic solvents, such as diethyl ether. Because the reaction (see below) releases heat, care must be taken to make sure that the solvent does not "boil over". 2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g) a) Determine the standard enthalpy change for this reaction. Comment on the relative strength of bonding and/or interactions in the products vs reactants, and briefly explain how you decided this. Substance Na(s) H₂O(1) NaOH(aq) H₂(g) AHºf (kJ/mol) 0 -285.83 -469.15 0

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Alkali metals are often used to remove traces of water from organic solvents,
such as diethyl ether. Because the reaction (see below) releases heat, care
must be taken to make sure that the solvent does not "boil over".
2 Na(s) + 2 H₂O(1) ➜ 2 NaOH(aq) + H₂(g)
a) Determine the standard enthalpy change for this reaction. Comment on the
relative strength of bonding and/or interactions in the products vs reactants,
and briefly explain how you decided this.
Substance
Na(s)
H₂O(1)
NaOH(aq)
H₂(g)
AHºf (kJ/mol)
0
-285.83
-469.15
0
b) How much heat (in kJ) is released via the reaction of 1.00 g of sodium metal with water? If this much heat is
released into 275 g of diethyl ether initially at 25°C, will the solvent reach its boiling point? If so, how many
grams of the ether will evaporate? Show calculations to support your answer.
For diethyl ether: Cs = 2.51 J/g⋅K, b.p. = 35°C, heat of vaporization = 377 J/g.
Transcribed Image Text:Alkali metals are often used to remove traces of water from organic solvents, such as diethyl ether. Because the reaction (see below) releases heat, care must be taken to make sure that the solvent does not "boil over". 2 Na(s) + 2 H₂O(1) ➜ 2 NaOH(aq) + H₂(g) a) Determine the standard enthalpy change for this reaction. Comment on the relative strength of bonding and/or interactions in the products vs reactants, and briefly explain how you decided this. Substance Na(s) H₂O(1) NaOH(aq) H₂(g) AHºf (kJ/mol) 0 -285.83 -469.15 0 b) How much heat (in kJ) is released via the reaction of 1.00 g of sodium metal with water? If this much heat is released into 275 g of diethyl ether initially at 25°C, will the solvent reach its boiling point? If so, how many grams of the ether will evaporate? Show calculations to support your answer. For diethyl ether: Cs = 2.51 J/g⋅K, b.p. = 35°C, heat of vaporization = 377 J/g.
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