A student forgot to add the reaction mixture ...

NCERT Class XI Chemistry States of Matter Solutions

Question : 11 of 23

Marks: +1, -0

A student forgot to add the reaction mixture to the round bottomed flask at 27°C but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477°C. What fraction of air would have been expelled out?

Solution:

Suppose the number of moles of gas present at 27°C in flask of volume V at pressure P is

n_1

, then assuming ideal gas behaviour,

PV =

n_1R

× 300 ...(1)

Suppose

n_2

= number of moles at 477°C, then PV =

n_2R

× 750 ...(2)

From equation (1) and equation (2), we get

n_2

\frac{300}{750} \times n_1

= 0.4

n_1

So, (1 - 0.4) × 100% is expelled out i.e. 60%..

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