Some Basic Concepts Of Chemistry Question 153
Question: Minimum amount of $ Ag _2CO _3(s) $ required to produce sufficient oxygen for the complete combustion of C, H, which produces 11.2 ltr. of $ CO _2 $ at S.T.P after combustion is: [Ag = 108] $ Ag _2CO _3(s)\to 2Ag(s)+CO _2(g)+1/2O _2(g) $ $ C _2H _2+5/2O _2\to 2CO _2+H _2O $
Options:
A) 276 g
B) 345 g
C) 690 g
D) 1380 g
Show Answer
Answer:
Correct Answer: B
Solution:
[b] $ Ag _2CO _3(s)\to 2Ag(s)+CO _2(g)+1/2O _2(g) $
$ C _2H _2+5/2O _2\to 2CO _2+H _2O $ By Stoichiometry of reaction Moles of $ CO _2 $ formed $ =\frac{11.2}{22.4}=\frac{1}{2} $ Moles of $ O _2 $ required $ =\frac{5}{4}\times \frac{1}{2}=\frac{5}{8} $
$ \therefore $ Moles of $ Ag _2CO _3 $ required $ =2\times \frac{5}{8}=\frac{5}{4} $ Mass of $ Ag _2CO _3 $ required $ =\frac{5}{4}\times 276=345g $
