Help me, ANSWER ALL 6 QUESTION, if you completed, you will have 30 POINTS

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?

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j