Some Basic Concepts Of Chemistry Question 211

Question: The number of molecules in 4.25 g of ammonia are [Pb. CET 2000]

Options:

A) $ 0.5\times 10^{23} $

B) $ 1.5\times 10^{23} $

C) $ 3.5\times 10^{23} $

D) $ 1.8\times 10^{32} $

Show Answer

Answer:

Correct Answer: B

Solution:

Molecular weight of $ NH _3 $ is 17 According to the mole concept $ 17,gm $ $ NH _3 $ has molecules $ =6.02\times 10^{23} $

$ \therefore 1,gm $ $ NH _3 $ has molecules $ =\frac{6.02\times 10^{23}}{17} $

$ \therefore $ $ 4.25,gm $ $ NH _3 $ has molecules $ =\frac{6.02\times 10^{23}\times 4.25}{17}=1.5\times 10^{23},molecule $



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