What is the molecular formula of a compound with an empirical formula P2O5 and a gram-molecular mass of 284 grams? And why?

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds

What is the vapor pressure of a solution with a benzene to octane?

How many moles of potassium are needed to react completely with 12.8 moles of magnessium bromide?