Determining the mass in grams of each substance

8.42 X 10^18 formula units of barium nitrate

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

Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size

Which material burns faster? metal aluminum