Calculate the Heat of reaction for this equation, then determine if bonds are breaking or forming O2(g) 0.0
NO (g) 90.37
NO2 (g) 33.85
2NO(g) + O2(g) 2NO2 (g)

A-248.44 KJ, bonds forming
B 0-113.04 KJ bonds forming
C 248.44 KJ, bonds breaking
D 113.04 KJ bonds breaking​

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?