Some Basic Concepts Of Chemistry Question 187
Question: The weight of a molecule of the compound $ C _{60}H _{122} $ is [AIIMS 2000]
Options:
A) $ 1.4\times {10^{-21}} $ g
B) $ 1.09\times {10^{-21}} $ g
C) $ 5.025\times 10^{23} $ g
D) $ 16.023\times 10^{23} $ g
Show Answer
Answer:
Correct Answer: A
Solution:
Molecular weight of $ C _{60}H _{122} $ $ =12\times 60+122\times 1 $ $ =720+122=842 $
$ \because $ $ 6\times 10^{23} $ molecule $ C _{60}H _{122} $ has mass = 842gm
$ \therefore $ 1 molecule $ C _{60}H _{122} $ has mass $ \frac{842}{6\times 10^{23}} $ $ =140.333\times {10^{-23}}gm $ $ =1.4\times {10^{-21}}gm $ .
