A compound of phosphorus and sulfur used in match heads contains 56.29% P and 43.71% S. The molar mass corresponding to the empirical formula of this compound is: (Atomic masses: P = 30.97; S = 32.04)

188.1 g / mol

220.1 g / mol

93.94 g / mol

251.0 g / mol

158.1 g / mol

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

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.

What is happening when the water inside a kettle heats up and begins to boil