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? *

Select the correct answer a modure consists of glucose and water. what is the percent composition of glucose in the mixture if it contains 1.3 moles of glucose (cho total mass of the mature is 276 grams? ) and the a 1775

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.

The zinc within a copper-plated penny dissolves in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can reach the zinc). the reaction between the acid and the zinc 2h+(aq)+zn(s)→h2(g)+zn2+(aq) . when the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 °c is 0.947 l at a total pressure of 743 mmhg . (vapor pressure of water is 23.78 mmhg at 25 °c .) what mass of hydrogen gas is collected? answer in appropriate significant figures