The rate of effusion of oxygen gas is three times the rate of effusion of an unknown gas under the same conditions of temperature and pressure. What is the molar mass of the unknown gas? Enter your answer to 3 significant figures.

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 does the symbol (–hfus) indicate in a phase change?

What statement goes against the kinetic theory of gases