A5.0 gallon container contains 15.0 moles of propane gas at room temperature (20. °c). what is the pressure of the gas? (1.0 gal = 3.79 l)

1.3 atm
19 atm
72 atm
1930 atm

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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?