28. (4 points)what is the percentage of water in the hydrate copper sulfate pentahydride – ( cuso₄ * 5h₂o)? answer all parts of this question – show your work a) (1 points) total mass of compound b) (1 points)mass of water in compound c) (2 points)percentage of water in compound.
percent of water = mass of water / mass of hydrate x 100%

29. (3 points) a gas has a volume of 725 ml at a temperature of –35.0°c. what volume will the gas occupy at 25.0°c? show your work.( points awarded 1 point for correct answer, 1 point for work, 1 point for correct set up ) *
use charles' law. make sure temperature is in kelvin

30. (2 points) why are there different directions for cooking things at high altitude than cooking things at sea level? *