a gaseous compound of Nitrogen contains 12.5% hydrogen and 87.5% of nitrogen. Find the empirical formula and molecular formula of the compound.(Atomic weight of H=1,N=14)(molecular mass of N=37)

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?