1.

20.2mL of CH_(6)CO OHreacts with 201.mL of C_(2) H_(5) OHto formCH_(3) CO OC_(2) H_(5) (d = 0 . 902 g/mL) by the following reaction CH_(3) CO OH+ C_(2) H_(5) OH to CH_(3) CO OC_(2) H_(5) + H_(2) O(a) Which compoundis the limitingreagent ? If 27.5 mL of pureethyl acetate is produced, whatis the per cent yield ? Densities of CH_(3) CO OHand C_(2) H_(5) OH are 1 . 0 5 g / mL and 0 . 789 g / mL respectively .

Answer»

SOLUTION :(a) `CH_(3) C O O H +C_(2) H_(5) OH to CH_(3) CO OH_(2)H_(5) + H_(2) O`
Mole of `CH_(3) CO OH = (2 0.2 xx 1.05)/( 60) =0.3535`
Mole of `C_(2) H_(5) OH = (20 . 1 xx 0.789)/( 46)= 0.3447`
As `CH_(3) CO OH` reacts with `C_(2) H_(5) OH` in a 1 : 1 mole RATIO and mole of `C_(2) H_(5)OH` is less than that of `CH_(3) CO OH, C_(2)H_(5)OH` is the limitingreagent.
(b) As ` C_(2)H_(5)OH` is thelimiting reagent, mole of `CH_(3) CO OC_(2)H_(15)` to be produced THEORETICALLY
= 0.3447 mole
But experimental yield of `CH_(3) CO OC_(2)H_(5) =(27.5 xx 0.902)/(84)`
= 0.2953 mole
`:.` per centyieldof ethyl acetate = `(0.2953)/( 0.3447) xx 100`
` = 85 . 66 %`


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