How many grams are in 0.02 moles of bel2

Does the energy in a solid increase or decrease when changing to a liquid?

How manyatoms of mercury are in 1.4214e+1 ml sample

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water