How many grams is needed to make the following solution?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

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

What is the measured amount of a product obtained from a chemical reaction?