molarity questions....HELP!?!?

Question

++What is the molarity of a solution made by mixing 3.90 g of aluminum chloride with 100.0 g of water? (The density of the solution is 1.08 g/ml).


++A 350-ml sample of glucose solution has a concentration of 0.260 M. How many moles of glucose are in the solution?


++What is the molarity of 2.50 L of solution that contains 56.9 g of sodium sulfate?


++If 88.2 grams of sugar (C12H22O11) are dissolved in ethanol to make a 0.500 M solution, what is the volume of the solution?


++If 2.5 moles of CaCl2 are dissolved in 4.50 liters of solution, what is the concentration of each ion in the solution?

Answer 1

1) Total mass of solution is 103.90, which will take up 96.2 ml, based on 1.08 g/ml. 3.90 g AlCl3/ 141.5 g/mol = 0.0275 mol. 0.0275 moles/ 0.0962 L = 0.286 M.

2) 0.260 M * 0.350 mL = 0.091 moles

3) 56.9 g Na2SO4 / 142 g/mol = 0.401 moles
0.401 moles/ 2.50 L = 0.160 M

4) 88.2 g C12H22O11 / 342 g/mol = 0.258 moles
0.258 moles / 0.500 M = 0.516 L

5) [Ca2+] = 2.5 moles/ 4.5 L = 0.556 M
[Cl-] = 5.0 ml / 4.5 L = 1.11 M

Answer 2

LOL. Sorry however the kind-o replace into humorous. I do have molars. Morality has to do with faith yet people without faith is additionally very ethical people. For me, i'm Jewish, morality and Judaism bypass hand in hand.

Answer 3

"theonlybedlin's" is correct on all but the second answer. 350 ml = .350 LITERS. he shows it as 0.350 ml in his response...... other than that, thumbs up...

Answer 4

This is your homework. Please do it.
Its very hard to find students who actually do there own homework anymore, maybe thats why the United States is ranking so low in the global education scales!!!!

Answer 5

MOLARITY QUESTIONS?
moles...
well.. the one that has the most moles is nikki... can i circle it?
big moles.. small moles.. red moles... you name it! nikki has em!