Chlorophyll a is one of the green pigments found in plants. chlorophyll a has the molecular formula c55h72mgn4o5. how many atoms are in this molecule?

The density of glycerin is 1.26grams/centimeter cubed . how many is this? use the conversion rates of and . express your answer to the correct number of significant figures.

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

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.