[Johulus]

 1.46 g of metal X merges with sufficient amount of oxygen. Weight of the product of chemical reaction is 1.864 g. Determine empirical formula of the compound.

So, it is unknown which metal is X. Its molar mass is unknown. I don't know the ratio between atoms. If its molar mass is unknown I can't calculate the amount of substance for x in moles. What should I do. I guess I can maybe determine the amount of oxygen but still I don't know the ratio between atoms.

[Borek]

You know the ratio is that of small integers - 1:2, 1:1, 2:1, 3:2, 2:3, something like that. Test each of them separately if they yield a molar mass of an existing element.