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Question
Number of molecules in 0.49 g of H2SO4 is ______ × 1021.
Options
6.022
30.11
0.03
3.01
MCQ
Fill in the Blanks
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Solution
Number of molecules in 0.49 g of H2SO4 is 3.01 × 1021.
Explanation:
Moles of H2SO4 = `0.49/98` = 0.005
Number of molecules = 0.005 × 6.022 × 1023
= 3.011 × 1021
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Notes
As per the Lakhmir Singh textbook, the question is written (“number of atoms”), the answer should be 21.08 × 1021, which is not among the options.
Therefore, if the textbook gives (d) 3.01, it is actually calculating the number of H2SO4 molecules, not the total number of atoms.
Is there an error in this question or solution?
Chapter 5: Mole Concept and Stoichiometry - Intext Question [Page 101]
