To make a one-molar (1 M) solution of NaCl, you need to add 1 mole of NaCl to the distilled water to make a final volume of 1L (1000 ml). A 1 M solution is said to have a molarity of 1. If you added 2 moles of NaCl to 1 distilled water, you would make a 2 M solution and its molarity would equal 2. You make up a 1 M solution of NaCl

-How many moles of NaCl are in the 1M NaCl solution?

-How many molecules of NaCl are there per ml of the solution?

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To make a one-molar (1 M) solution of NaCl, 1 mole of NaCl is added to the distilled water to make a final volume of 1L (1000 ml). So,

1) In 1 M NaCl solution, there is **1** mole of NaCl i.e `6.023*10^23` molecules of NaCl.

2) 1000 ml of the solution contains `6.02 * 10^23 ` molecules of NaCl

Hence, 1 ml of the solution contains `(6.023 * 10^23)/1000` =` 6.023 * 10^20` molecules of NaCl.

Therefore, there are `6.023 * 10^20` molecules of NaCl per ml of the solution.

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