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percentage yield PLS HELP

(d) In an experiment starting with 5.05 g of phenylamine, 4.82 g of purified product wereobtained in step 1.
Calculate the percentage yield in this reaction.
Give your answer to the appropriate number of significant figures.
the mark scheme is
(d) Mr product = 135.0
1
Expected mass = 5.05 × = 7.33 g
1
Percentage yield = × 100 = 65.75 = 65.8(%)
i tried getting mr of phenyl amine which is 72 from the c6h5
but that is not right i also calculated mr of expected product which is 17+16+12+4 from the NCOCH3 i added this +the c6h5 =126 and this is still wrong
RFM of phenylamine is 93. Moles of phenylamine= 5.05/93=0.0543 moles. 1:1 ratio therefore moles of product also=0.0543. RFM of product=135 therefore mass of product= 135*0.0543=7.3305g which is the theoretical yield. %yield= 4.82/7.3305*100= 65.8%
Reply 2
Avatar for Hi freinds
Hi freinds
OP
11
Original post by Rossg123
RFM of phenylamine is 93. Moles of phenylamine= 5.05/93=0.0543 moles. 1:1 ratio therefore moles of product also=0.0543. RFM of product=135 therefore mass of product= 135*0.0543=7.3305g which is the theoretical yield. %yield= 4.82/7.3305*100= 65.8%

the part im stuck at is the RAM of product because the moles of phenylamine=0.0543 moles of product
and to calculate Ram of product its mass/moles i did 4.82 ÷ 0.0543 =‬88.7 so im confused
Is it a past paper question and if it is, what year and exam board

Original post by Hi freinds
the part im stuck at is the RAM of product because the moles of phenylamine=0.0543 moles of product
and to calculate Ram of product its mass/moles i did 4.82 ÷ 0.0543 =‬88.7 so im confused
Reply 4
Avatar for Hi freinds
Hi freinds
OP
11
what is this question i dont know i just am answering a bunch of physical questions
i honestly dont understand how you got thatt mr of the product could you pleasse explain your working out
Original post by Rossg123
Is it a past paper question and if it is, what year and exam board
Is it definitely a 1:1 ratio?
Original post by Hi freinds
what is this question i dont know i just am answering a bunch of physical questions
i honestly dont understand how you got thatt mr of the product could you pleasse explain your working out
Reply 6
Avatar for Hi freinds
Hi freinds
OP
11
Original post by Rossg123
Is it definitely a 1:1 ratio?


i dont know i went by how you said it was
It works out at 135 if it's a 2:3 ratio
Original post by Hi freinds
i dont know i went by how you said it was
Reply 8
Avatar for Hi freinds
Hi freinds
OP
11
but how can you tell its a 2:3 ratio
Original post by Rossg123
It works out at 135 if it's a 2:3 ratio

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