Question

Calculate no:of atoms

a)16moles of Helium (He)
b)16gram of Helium (He)​

Answer 1

solve by avogadro number

Answer 2

Explanation:

a) I mole oh He contains 6.022 x 10^23 atoms

Since He monatomic gas.

So,16 moles contain 16 x 6.022 x 10^23 atoms

i.e 96.352 x 10^ 23 atoms

b) The molecular weight of He is 4.

So mole of He weighs 4 gram.

Hence 16 gram contain 4 moles of He.

Now 4 x 6.022 x 10^23 = 24.088 x 10^23 atoms

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