Jack noticed that a puddle that he had to walk around on his way to school was not there on his way home. What happened to the puddle?
A It evaporated
It's magic.
C it melted.
Dit condensed.

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

Based on the equation and the information in the table, what is the enthalpy of the reaction?

Why does his teacher ask him to balance the equation by including the correct coefficient