Answer to Question #197350 in General Chemistry for Lara

Question #197350

How many moles and how many atoms are present in 11.5 g of sodium? Use NA = 6×1023

1
Expert's answer
2021-05-24T07:26:21-0400

Molar mass of Na=23g/mol

no. of moles = weight/molar mass

n = 11.5/23

no. of moles = 0.5

no. of moles = no. of atoms/avogadro’s number

0.5 = no. of atoms/6.022*10^23

0.5*6.022*10^23 atoms = no. of atoms

3.011*10^23 atoms.

So there are 3.011*10^23 atoms present in 11.5g of sodium sample.


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