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1. 2.23 of lead oxide contains 2.07g of lead. What is the formula of lead oxide?

2. Patronite is an ore of vanadium sulfide. If 3.58 of Patronite contains 1.02 of vanadium, what is the formula of Patronite?

3. A compound consits of 63.2% manganese and 36.8% oxygen by mass. What is its formula?

4. Magnetite is an ore of iron which contains 72.4% by mass of iron, the rest being oxygen. What is the formula of Magnetite?

This forum does not exist so you can get others to do your work for you. They must provide explanations so you can learn from it. Just a warning.

Just a thought; you won't learn anything by people giving you the answers.

I wanted the explanation so I could know how to do it. It's just I'm having trouble doing it.

I know, what level Science is this?

It's GCSE.

You should google some questions. ;D

Have u read this thread??