A5.0l balloon in a freezer is at a temperature of -50˚c has a pressure of 800 mm hg. what will be the new pressure (in mm hg) if the balloon is taken out and placed in a warm room (temperature 37˚c) and the volume expands to 7.0 l? your answer

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.

Which substances have the lowest melting points: ionic covalent, or metallic

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )