Someone please help me with this

Question

	Cupric chloride hydrate has a formula weight of 170 grams per mole. What is the formula weight of the metal salt alone?
g/mol
3.	How many moles of water are attached to the metal salt in cupric chloride hydrate?
moles
4.	Find the theoretical ratio of mass between the anhydrous metal salt and the hydrate of cupric chloride.
5.	Which of the following hydrates has the highest formula weight as the anhydrous salt?
cobalt chloride
cupric chloride
calcium chloride
magnesium chloride
6.	The molecular mass of aluminum sulfate is 342 g/mol. You find through experimentation that the ratio of mass of dry salt to mass of hydrate is a ratio of close to 3/5. What is the percentage water by mass in the hydrate?
20%
40%
60%
80%
7.	The molecular mass of anhydrous aluminum sulfate is 342 g/mol. The precise ratio of mass of anhydrous salt to hydrate is 61%. What is the approximate mole ratio of water to salt for aluminum sulfate hydrate? Express your answer as an integer.
:1
8.	A 2.914 g sample of gypsum (hydrated calcium sulfate, CaSO4) is heated in a crucible until it reaches a constant mass. The mass of the anhydrous CaSO4 is 2.304 g. How many millimoles of water were removed by the heating?
mmol
9.	A 2.914 g sample of gypsum (hydrated calcium sulfate, CaSO4) is heated in a crucible until it reaches a constant mass. The mass of the anhydrous CaSO4 is 2.304 g. How many millimoles of calcium sulfate remain after the heating?
mmol
10.	A 2.914 g sample of gypsum (hydrated calcium sulfate, CaSO4) is heated in a crucible until it reaches a constant mass. The mass of the anhydrous CaSO4 is 2.304 g. What is the whole number ratio of water to calcium sulfate

Answer 1

Your questions are too long for me to answer here, but I will start.

Cupric Chloride is CuCl2. The formula weight is Cu - 63.5, Cl2 - 2*35.5 = 71, total = 134.5.

As a check, water is 18. If the Cupric chloride hydrate has a formula weight of 170 grams per mole, 170-134.5 = 35.5 approximately 2 times the water. Going the other direction, 170 - 36 = 134 g/mol for the metal salt.

There are 2 moles of water per mole of salt.

The mass ratio is the ratio of the formula weights. Salt/hydrate = (134g/mol)/(170g/mole) = 0.788.