Some Basic Concepts Of Chemistry Question 203

Question: Volume of a gas at STP is $ 1.12\times {10^{-7}} $ cc. Calculate the number of molecules in it [BHU 1997]

Options:

A) $ 3.01\times 10^{20} $

B) $ 3.01\times 10^{12} $

C) $ 3.01\times 10^{23} $

D) $ 3.01\times 10^{24} $

Show Answer

Answer:

Correct Answer: B

Solution:

$ \because $ 22400cc of gas at STP has $ 6\times 10^{23} $ molecules
$ \therefore $ 1.12 $ \times {10^{-7}} $ of gas at STP has $ \frac{6\times 10^{23}\times 1.12\times {10^{-7}}}{22400} $ $ =.03\times 10^{14}=3\times 10^{12} $ .



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