V391 pegasi b is a star that is 4,570 light years away from earth. what is this distance in kilometers?

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.

Can someone me with 6 to 10 plz this is for masteries test.

Is a pencil falling to the floor anon contact force, a force, or a contact force