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Question

Chemistry Question on Some basic concepts of chemistry

If the atomic mass of carbon was set at 100 u, what would be the value of Avogadro's number ?

A

6.02×10236.02 \times 10^{23}

B

6.02×10256.02 \times10^{25}

C

5.01×10245.01 \times 10^{24}

D

6.02×10216.02 \times 10^{21}

Answer

5.01×10245.01 \times 10^{24}

Explanation

Solution

Mass of 1 atom of carbon (C12)=126.02×1023g \left(C^{12}\right)=\frac{12}{6.02\times10^{23} g} As the atomic mass of C12C^{12} is 100 u100\,u number of atoms present in 1 g1 \,g atom or 100 g100\, g is Avogadro?? number on this scale ∴\therefore Avogadro?? number =10012/6.02×1023=\frac{100}{12/ 6.02 \times 10^{23}} =100×6.02×102312=\frac{100\times6.02\times10^{23}}{12} =5.01×1024=5.01\times10^{24}