Consider these equations: 2S (s) + 3O2 (g)→2SO3 (g) , ΔH = −792 kJ 2S (s) + 2O2 (g)→2SO2 (g) , ΔH = −594 kJ 2SO2 (g) + O2 (g)→2SO3 (g) , ΔH =?
What is the missing ΔH ?
−294 kJ
−198 kJ
+198 kJ
+294 kJ

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

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.