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Ocr gateway a chemistry as level paper 2021 paper 2

ilayda 1234

I need help with paper 2 2021 question 3 c as I don’t understand where they got 90 from

Reply 1

HMAC2004

Could you link the paper and I will try and solve it for you

Reply 2

ilayda 1234

https://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Past-Papers/OCR-A/AS-Paper-2/November%202021%20QP%20-%20Paper%202%20OCR%20(A)%20Chemistry%20AS-level.pdf

Question 3 c

Reply 3

HMAC2004

I think I found it
The 90 is the mr of the 2 HOOC groups add together
Then you subtract 90 from 132 to get the mass of (CH2)n
Then divide 42 by 14 the mr of. CH2
To get
3

IMG_1713.jpeg217.5KB

Reply 4

HMAC2004

Does it make sense now ?

Reply 5

ilayda 1234

Original post by HMAC2004

I think I found it
The 90 is the mr of the 2 HOOC groups add together
Then you subtract 90 from 132 to get the mass of (CH2)n
Then divide 42 by 14 the mr of. CH2
To get
3

Original post by HMAC2004

Does it make sense now ?

Yes thank you

Do you have any ideas of what question are on the 2022 paper 2 ocr gateway a chemistry as level

Reply 6

HMAC2004

I don’t actually do ocr gateway chemistry however I would practice the following :
Bonding
Mechanisms
Equilibria
Practicals as they will always come up