Alaboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. how many more grams of selenium than chromium does this represent?
a) 65.5 g
b) 53.9 g
c) 27.0 g
d) 13.5 g

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.