How is dimensional analysis (converting units) used to solve problems?

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore

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

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?