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That really depends upon the compound. Since you have not described the compound in any way, there would be no way to work out the formula. Other than that, you are always guided by the Periodic Table of elements and your knowledge of the valences of the elements; you should be familiar with common radicals, and with various organic compounds which might be part of a formula. The more you know about chemistry, the better chance you will have of working out a given formula.

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11y ago

What else can I help you with?