Determine the number of atoms in each of the following? a) 5.40 g B
b) 0.250 mol S
c) 0.0384 mol K

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.