Some Basic Concepts Of Chemistry Question 139
Question: Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure lime stone $ (CaCO _3). $
Options:
A) 104.4 kg
B) 105.4 kg
C) 212.8 kg
D) 106.4 kg
Show Answer
Answer:
Correct Answer: D
Solution:
[d] $ \because $ 100 kg impure sample has pure $ CaCO _3 $ = 95 kg
$ \therefore $ 200 kg impure sample has pure $ CaCO _3 $
$ =\frac{95\times 200}{100}=190,kg $
$ CaCO _3\to CaO+CO _2 $
$ \because $ 100 kg $ CaCO _3 $ gives $ CaO=56,kg $ .
$ \therefore $ 190 kg $ CaCO _3 $ gives $ CaO=\frac{56\times 190}{100}=106.4,kg $ .
