A student increases the temperature of a 100 cm balloon from 60°C to 120°C. What will the new volume of the balloon be? (Be careful with units.)
200 cm
236 cm
118 cm
400 cm

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.

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %