Some Basic Concepts Of Chemistry Question 179
Question: The weight of $ 1\times 10^{22} $ molecules of $ CuSO _4.5H _2O $ is [IIT 1991]
Options:
A) 41.59 g
B) 415.9 g
C) 4.159 g
D) None of these
Show Answer
Answer:
Correct Answer: C
Solution:
[ $ \because $ Molecular weight of $ CuSO _4.5H _2O $ $ =63.5+32+64+90 $ $ =249.5 $ ] $ 6\times 10^{23} $ molecules has weight $ =249.5gm $
$ 1\times 10^{22} $ molecules has weight $ =\frac{249.5\times 1\times 10^{22}}{6\times 10^{23}} $
$ =41.58\times {10^{-1}} $ $ =4.158 $
