Answers

2015-07-12T18:01:13+05:30
Mass of 1 calcium atom = 40u
number of atoms present in 120u = 120/40 = 3 atoms.

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If you want to find the number of atoms in 120g of calcium,
then multiply it with avogadro number.

number of atoms in 120g calcium = 3×(6.022×10²³) = 1.8066 × 10²⁴ atoms

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2015-07-15T11:08:00+05:30
 At wt of Ca is 20u ,so there is 6 Ca atoms
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