percentage yield PLS HELP

Watch this thread
Hi freinds
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 2 years ago
#1
(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
0
reply
Rossg123
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 2 years ago
#2
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%
0
reply
Hi freinds
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
Report Thread starter 2 years ago
#3
(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
0
reply
Rossg123
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report 2 years ago
#4
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
0
reply
Hi freinds
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report Thread starter 2 years ago
#5
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
0
reply
Rossg123
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#6
Report 2 years ago
#6
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
0
reply
Hi freinds
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#7
Report Thread starter 2 years ago
#7
(Original post by Rossg123)
Is it definitely a 1:1 ratio?
i dont know i went by how you said it was
0
reply
Rossg123
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#8
Report 2 years ago
#8
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
0
reply
Hi freinds
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#9
Report Thread starter 2 years ago
#9
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
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How did your Edexcel A-level Economics Paper 1 go?

Loved the paper - Feeling positive (68)
16.19%
The paper was reasonable (205)
48.81%
Not feeling great about that exam... (102)
24.29%
It was TERRIBLE (45)
10.71%

Watched Threads

View All