Some Basic Concepts Of Chemistry Question 57
Question: On subjecting 10 mL mixture of $ N _2 $ and CO to repeated electro spark, 7 mL of $ O _2 $ was required for combustion. What was the mole percent of CO in the mixture? (All volumes were measured under identical conditions)
Options:
A) 60
B) 40
C) 6
D) 4
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ \underset{a}{\mathop{N _2}},+\underset{a}{\mathop{O _2}},\to \underset{2a}{\mathop{2NO}}, $
$ CO+\frac{1}{2}O _2\to CO _2 $
$ ( 10-a )\frac{(10-a)}{2}~( 10-a ) $
$ a+\frac{(10-a)}{2}=7 $
$ \therefore a=4 $ volume of CO = 6 mL Mole % of $ CO=~\frac{6\times 100}{10}~=60 $
