2.6 g of oxygen gas react with excess hydrogen gas to produce 2.4 g water. what is the percent yield? a. 63% b. 83% c. 160% d. 46%

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.

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

In which phase of mitosis do the spindle fibers pull the chromosomes apart to opposite sides of the cell ?