Can someone me with these three chemistry questions?

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.

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.