Question

# How do you determine the number of ions per formula unit?

How do you determine the number of ions per formula unit?

one formula unit is equal to one mol of a substance. So one formula unit of carbon dioxide would have the formula CO2.

Now, in every formula unit there are 6.022 X 10^23 ions (avogadro's number). In the case of CO2, there are 3 ions in each formula unt. So for carbon dioxide, you add up the total number of ions present (3--1 carbon plus 2 oxygen) and multiply 3 by 6.022 x 10^23 to find out the number of ions in a formula unit.

CO2 = 1.8 X 10^23 ions
H3PO4 = 4.8 X 10^24 ions
AL(OH)3 = 4.2 X 10^24 ions
KNO2 = 2.4 X 10^24 ions
Al(OH)CL2 = 3.01 X 10^24 ions

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