Search any question & find its solution
Question:
Answered & Verified by Expert
Assertion: One mole of $\mathrm{NaCl}$ contains $6.023 \times 10^{23}$ molecules of sodium chloride.
Reason : $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ also contains $6.023 \times 10^{23}$ molecules of $\mathrm{NaCl}$.
Options:
Reason : $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ also contains $6.023 \times 10^{23}$ molecules of $\mathrm{NaCl}$.
Solution:
2655 Upvotes
Verified Answer
The correct answer is:
Ifboth assertion and reason are true but reason is not the correct explanation of assertion.
Molar mass or mass of 1 mole of $\mathrm{NaCl}$
$$
=23+35.5=58.5 \mathrm{~g}
$$
According to mole concept,
1 mole of molecules $=$ Gram molecular mass $=6.023 \times 10^{23}$ molecules
$\therefore 58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ also contains $6.023 \times 10^{23}$ molecules of $\mathrm{NaCl}$.
$$
=23+35.5=58.5 \mathrm{~g}
$$
According to mole concept,
1 mole of molecules $=$ Gram molecular mass $=6.023 \times 10^{23}$ molecules
$\therefore 58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ also contains $6.023 \times 10^{23}$ molecules of $\mathrm{NaCl}$.
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.