Some Basic Concepts Of Chemistry Question 142
Question: A self-contained breathing apparatus used $ KO _2 $ to convert $ CO _2 $ and $ H _2O $ in exhaled air into oxygen and $ KHCO _3 $ as shown in the equation $ KO _2+H _2O+CO _2\xrightarrow{,},KHCO _3+O _2 $ .
How many molecules of $ {O _{2(g)}} $ will be produced from the 0.044 g of $ C{O _{2(g)}} $ that is exhaled in a typical breath?
Options:
A) $ 6\times 10^{20} $
B) $ 4.5\times 10^{20} $
C) $ 2.25\times 10^{21} $
D) $ 4.5\times 10^{22} $
Show Answer
Answer:
Correct Answer: B
Solution:
[b] Balanced reaction is $ 2KO _2+H _2O+2CO _2\to 2KHCO _3+\frac{3}{2}O _2 $
$ \therefore $ moles of $ O _2=\frac{3}{4}\times \frac{0.044}{44} $
$ \Rightarrow $ molecules $ =\frac{3}{4}\times {10^{-3}}\times 6\times 10^{23} $
