This question has multiple parts. Work all the parts to get the most points. DDT

Question

This question has multiple parts. Work all the parts to get the most points. DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction: In a government lab, 1156 g of chlorobenzene is reacted with 482 g of chloral. What mass of DDT is formed, assuming 100% yield? Mass = ___________ g Which reactant is limiting? Which is in excess? ___________ is limiting. _______________ is in excess. What mass of the excess reactant is left over? Mass = __________ g in excess If the actual yield of DDT is 294.0 g, what is the percent yield? Percent yield = _____________ %

Explanation / Answer

mol of ChloroBenzne = mass/MW = 1156/112.56 = 10.270 mol

mol of Chloral = mass/MW = 482/147.388 = 3.27027 mol

ratio is 2:1

so

3.27027 mol of Chloral will need 1/2*3.27027 = 1.63513 mol of Chlorobenzene required

so

1:1 chloral:DDT

so

3.27027 mol of chloral form 3.27027 DDT

mass = mol*MW = 3.27027 *354.49 = 1159.27 g of DDT produced

b)

limiting reactant is chloral

chlorobenzene is in excess

c)

excess left --> 10.270 initial - 1.63513 mol reacted = 8.63487 mol of clbenzene left

mass = mol*MW = 8.63487*112.56 = 971.940 g of chlorobenzene left

d)

if yield is 290 g

then

% yield = actual /theoretical * 100% = 290 /1159.27 *100 = 25.01 %

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