Some Basic Concepts Of Chemistry Question 201

Question: Which of the following has least mass [Pb. PET 1985]

Options:

A) $ 2\ g $ atom of nitrogen

B) $ 3\times 10^{23} $ atoms of $ C $

C) 1 mole of $ S $

D) $ 7.0\ g $ of $ Ag $

Show Answer

Answer:

Correct Answer: B

Solution:

A. 2gm atom of nitrogen = 28gm B. $ 6\times 10^{23} $ atoms of C has mass $ =12gm $

$ 3\times 10^{23} $ atoms of C has mass $ =\frac{12\times 3\times 10^{23}}{6\times 10^{23}}=6gm $

C. 1mole of S has mass = 32gm D. 7.0gm of Ag So, lowest mass = 6gm of C.



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