What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, lif, (gram-formula mass =26 grams/mole)?
(1) 1.3 m (3) 3.0 m
(2) 2.0 m (4) 0.75 m

The answer is (1) 1.3 M. The first thing you need to do is to convert the unit of gram to mole. The mol number of LiF is 52/26=2 mol. Then using the volume to calculate the molarity: molarity=2/1.5=1.3 M.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.