CBSE Class 9 Answered
what is the formula to find the number of moles and the number of molecules and atoms
Asked by Omkar | 29 Feb, 2016, 05:07: PM
Expert Answer
One Mole=6.022 ×1023 (Avogadro's No.) atoms/ions/molecules/particles
No. of moles=Mass /Molecular mass
Let us take an example of 4 g of hydrogen.
Molar mass of hydrogen is 2 g
Given weight is 4 g.
No. of moles of hydrogen molecules in 4 g Hydrogen =4(wt.)/2(Mol. mass) =2 moles of hydrogen molecules.
Now 1 mole =6.022×1023 molecules of hydrogen.
Hence, 2 moles of hydrogen molecules = 2 x 6.022×1023 molecules of hydrogen = 12.046 ×1023 molecules of hydrogen
Answered by Prachi Sawant | 01 Mar, 2016, 10:42: AM
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