Question

A chemist's report on a batch of pharmaceutical products, Aspirin (C2H20A) (250mg tablets)
and Paracetamol (C3H NO2) (500mg tablets) indicated a +0.5% weight error in each tablet.
Due to this error, the consumer gets extra 'X' molecules of aspirin per tablet and extra'y
molecules of paracetamol per tablet. Choose the 'best' relation between x and y.
a) x=y
b) xxy
C) y>x
d) x=2y (give ans with full step wise explanation)​

Answer 1

molecular weight of asprin is 180g

molecular weight of paracetamol is 151g

according to the question

a person takes 250 mg and 500 mg of aspring and paracetamol respectively calculate number of moles with considering it as standard

so asprin = 0.72 and paracetamol =0.302

0.5percent increase means

aspring =189 and paracetamol = 158.55

calculate the number of moles of new weight and subtract them to get the increase amount

you will get y is greater than x

note if you are using resonance ijso module then the answer given is wrong , confirmed it from iapt solution

Answer 2

option (c) is the correct answer

Explanation:

In the given question, it is said that, Aspirin (C2H20A) (250 mg tablets)

and Paracetamol (C3H NO2) (500 mg tablets) indicated a +0.5% weight error in each tablet.

hence, aspirin becomes 0.71999 and paracetamol becomes 0.30215 as the molecular weights of aspirin and paracetamol are 180.158g and 151.163g respectively.

now when we increase 0.5% i.e.,

aspirin = 189.04 and paracetamol = 158.55

by observing the above results and by subtracting the increase rate by calculating the number of moles of new weight,

We get Y>X

hence, option (c) is correct.