Some Basic Concepts Of Chemistry Question 122

Question: What is the atomic weight of an element X for which a sample containing 1.58×1022 atoms weigh 1.05 g?

Options:

A) 28 g

B) 20 g

C) 40 g

D) 23 g

Show Answer

Answer:

Correct Answer: C

Solution:

[c] We know that, one mole of an element =6.02×1023 atoms = Atomic weight of the element Now, 1.58×1022 atoms weigh 1.05 g

6.02×1023 atoms weigh
=(1.05×6.02×1023)1.58×1022
= 40 g Atomic weight of X=40g



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