The number of atoms in 1 mg of NaCl = 1 × 10^19 atoms
Calculation of quantity of atoms
Atomic mass of Na = 23
Atomic mass of Cl = 35.5
Therefore the molar mass of NaCl = 23 + 35.5 = 58.5g/mol
But 1 mg = 0.001g and 1 mol = 6.022 × 10^ 23
Therefore, If = 58.5g = 6.022 × 10^ 23 atoms
0.001g =X atoms
X atoms = 6.022 × 10^23 × 0.001/58.5
= 0.1 × 10^23 × 10^-³
= 1 × 10^19 atoms
Therefore, the number of atoms in 1 mg of NaCl =1 × 10^19 atoms.
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