What formula is a polyatomic ion?

Answer 1

To find the molar mass of a polyatomic ion, you simply find the molar mass of every element that makes up the ion and add them together. Do not forget to multiply the molar mass if there are multiple atoms.

For Example: Find the molar mass of NO3

NO3 is made up of Nitrogen and Oxygen

Nitrogen has a molar mass of 14.0067 and Oxygen has a molar mass of 15.9994.

There are three atoms of Oxygen, so we multiply 15.9994 x 3 to get 47.9982

47.9982 plus 14.0067 equals 62.0049

So 62.0049 is the molar mass of NO3

Hope that helps! :)

Answer 2

Some major polyatomic ions include

PO4 charge -3

PO3 charge -3

CO3 charge -2

ClO4 charge -1

NH3 charge +1

NO3 charge -1

NO2 charge -1

If you need anymore than look up polyatomic ions in Google.

Answer 3

Same as the molar mass of a magnesium atom, as an electron's mass is only 1/1840.

Therefore M=~24.

Answer 4

In a polyatomic ion, the sum of oxidation numbers of all the elements in the ion must be equal to the net charge of the ion.