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Asked by Orange Last Modified
Answer (i)
1 mole of He = 6.022 × 1023 atoms of He
52 mol of He = 52 × 6.022 × 1023 atoms of He
= 3.131 ×1025 atoms of He
(ii)
Atomic mass of He = 4 amu
In 4 amu is the mass of He, count of atoms = 1
Therefore 52 amu is the mass of He atoms= 1/4x52 = 13 atoms of He
(iii)
4g of He contains = 6.022x 1023 atoms
Therefore 52 g of He contains = 6.022x 1023 /4 x 52 = 7.83 x 1024 atoms
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