The first weight is AB the second weight is A so doing AB-A= B.

Now that you have the weight of A and B you can work out the formulae by doing the weight divided by the Ar.

e.g

A= 22g with an ar of 11

A= 22/11= 2

B=72g with an ar of 18

B=72/18= 4

A2B4 and to simplify to empirical formula AB2

is the weight divided by the Ar moles

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