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Chemistry urgent help !!!

Dominique321 · 2015-03-01 16:30:17

Benzoic acid was prepared in a school laboratory by reacting a saturated solution of alkaline potassium manganate(VII) containing 3g of KMnO4 with 1cm3 of phenylmethanol. The balanced equation for the reaction is 3C6H5CH2OH+4KMnO4> 3C6H5COOH+4MnO2+H2O+4KOH 0.65g of benzoic acid were formed. The density of phenylmethanol is…

01-03-2015 5:30pm

#1

Dominique321

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Join Date: January 2014

Posts: 9

Benzoic acid was prepared in a school laboratory by reacting a saturated solution of alkaline potassium manganate(VII) containing 3g of KMnO4 with 1cm3 of phenylmethanol. The balanced equation for the reaction is
3C6H5CH2OH+4KMnO4
> 3C6H5COOH+4MnO2+H2O+4KOH
0.65g of benzoic acid were formed. The density of phenylmethanol is 1.04g/cm3

(a) show that phenylmethanol is the limiting reactant
(B) calculate the percentage yield of benzoic acid

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#2 02-03-2015 10:02pm

DepoProvera

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Posts: 398

Find the moles of each of the reactants and apply the stoichiometric ratio to them.. Which is the smaller value will be the limiting reactant... Then use the moles of limiting reactant to get the theoretical moles of benzoic acid (using the ratio again).. then percentage yield is actual/theoreticalx100

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