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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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Juicy Juicy
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11 years ago

Acetic Acid (2.0g) + Isopentyl Alcohol (0.9g) Rightwards Arrow Isopentyl Acetate (1.15g) + H2O

What is the limiting reagent?
What is the theoretical yield?
What is the percent yield?
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#1
11 years ago
Find the molecular formula for the three compounds.
Find their formula weight (molar mass / molecular weight).
Convert their masses into moles (Mol = m / FW)
The lower of the first two is the limiting reagent.
The moles of the lower is the moles of the product (the theoretical yield)
Percent yield = 100 x Moles of the ester / theo. moles
wrote...
#2
11 years ago
CH3COOH + CH3CH3(CH3)CH3CH2OH Rightwards Arrow CH3COOCH2CH2CH(CH3)2 + H2O
or
C2H4O2 + C5H12O Rightwards Arrow C7H14O2 + H2O

Acetic Acid: 2.0g / 60g/mol = 0.03 mol
Isopentyl Alcohol: 0.9g / 88g/mol = 0.01 mol
Thus, isopentyl alcohol is the limiting reagent.

Theoretical yield of isopentyl acetate:
0.01 mol * 130g/mol = 1.33 g

Percent yield:
1.15g / 1.33g * 100% = 86.5%
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