The molecular mass of sulphur is 40u .Find the no. of atoms present in 0.4 g of calcium
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No dear molecular mass of Sulphur is not 40u but instead it is 32u,
The molecular mass of calcium is equal to 40u
No of moles = mass /molar mass
n = 0.4/40
n = 0.01 mol
no of atoms = n × Na
= 0.01 × 6.022 × 10^23
= 6.023 × 10^21 atoms
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