Answer :

The molar mass of NaCl = The atomic weight of Na + The atomic weight of Cl

Atomic weight; Na = 22.99 g, Cl = 35.45 g


Thus, molar mass of NaCl = 23 + 35.5 = 58.5g/mole.


The number of moles =


Each NaCl particle contains one Na+ and one Cl ion = 2 ions


Total moles of ions = 0.1 × 2 = 0.2 moles


Number of ions = total number of moles of ions X Avogadro's number


Therefore,


No. of ions = 0.2 × 6.022 ×1023


= 1.2042 ×1023 ions


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