How many chloride ions are in 5.13 moles of sodium chloride?

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t-nez | High School Teacher | (Level 3) Associate Educator

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There is one chloride ion, Cl-, in each formula unit of NaCl. This means there are 5.13 moles of Cl- in 5.13 moles of NaCl. One mole is 6.02 x10^23 particles, so you would calculate the number of chloride ions in 5.13 moles as follows:

5.13 moles x (6.02 x10^23 ions/1 mole) = 3.09 x10^23 ions

When you are trying to solve a problem like this, there are two things that you need to know:

1. How many ions are produced per molecule of the ionic substance

and 

2. 1 mole af anything = 6.02 x10^23

Sometimes there are more than one of an ion per formula unit of the substance. For example, MgCl2 has 2 chloride ions per formula unit so you would need to account for this in the calculation.

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