Mole ConceptHard
Question
5.85 g of NaCl is dissolved in 1 L of pure water. The number of ions in 1 mL of this solution is
Options
A.6.02 × 1019
B.1.2 × 1022
C.1.2 × 1020
D.6.02 × 1020
Solution
Mole of NaCl = 
= 0.1
Molarity =
= 0.1 M
Moles in 1 ml of solution = MV = 0.1 × 10-3 = 10-4 mole.
Number of ions in 1 ml = 2 × 10-4 × 6.023 × 1023 = 1.204 × 1020.
= 0.1Molarity =
= 0.1 MMoles in 1 ml of solution = MV = 0.1 × 10-3 = 10-4 mole.
Number of ions in 1 ml = 2 × 10-4 × 6.023 × 1023 = 1.204 × 1020.
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