Question

EASY QUESTION! FAN AND MEDAL QUICK!

you have a pot of pasta boiling water on the stove. which method will you use to separate the mixture of pasta and water?
A.OSMOSIS
B.DISTILLATION
C.FILTRATION
D.FRACTIONATION

Answer 1

@sumair7861 what do you think my friend?

Answer 2

@matt101 I have not heard the name of osmois and fractionation ? Have you?

Answer 3

i think it is filtration.

Answer 4

I believe it is filtration as well

Answer 5

ok thanks @korosh23 , could you help me with another quick one?

Answer 6

@korosh23 I have :)

@sumair7861 then you'd be right! Filtration is any method used to separate a solid from a liquid by passing the mixture through a semipermeable membrane that only lets the liquid through.

Answer 7

http://www.mrrae.freeserve.co.uk/graphics/filtration.gif yeah matt is right

Answer 8

sure go ahead we both help.

Answer 9

how many grams of AgNo3 are needed to prepare a 0.25 m solutiuon in 500 grams of water?

Answer 10

Is that supposed to be 0.25 m or 0.25 M? It makes a difference!

Answer 11

That is right whenever you see solution it means Molarity or M

Answer 12

m

Answer 13

lower case m

Answer 14

...and a last one. how much energy is released when 16.5 g of steam is condensed at 100 Degrees Celcius

Answer 15

Well I was getting at m=molality and M=molarity which are two different units of concentration.

Molality is moles of solute/KILOGRAM of solvent.
Molarity is moles of solute/LITRE of solution.

And as I type this, I realize it doesn't matter for this question because we're talking about water, whose density is 1 g/mL (so 500 g occupies 500 mL).

Anyways, for this question then you'll want molality, which is m = n/M, where m is the molality, n is moles of solute, and M is kg of solvent.

You have enough information to solve for moles of solute, so just multiply that by the molar mass of AgNO3 and you'll have your answer!

Answer 16

what to multiply?

Answer 17

i am not understanding what to multiply

Answer 18

@matt101 do we have to write a chemical equation for this question?

Answer 19

@sumair7861 I guess you ahve to wait until he comes back to answer your question. He is stronger in chemistry, Post your questions seperately from each other. Not all in one.

Answer 20

Nope no need to write a chemical equation - we're just focusing on AgNO3! You want to find a mass of AgNO3. We're given information about a concentration of AgNO3, so we can use that to eventually find mass.

We're given concentration (0.25 m) and we're given volume (0.5 L - remember, since the density of water is 1 g/mL, 500 g occupies 500 mL or 0.5 L). What we're missing is moles. You know the equation to find molality:

\[C = {n \over M}\]
Where C is the concentration (in m), n is the moles of solute (what we're solving for), and M is the mass of the solvent (in kg). Once you've solved for moles of AgNO3, you can find the corresponding mass simply by multiplying that mole value by the molar mass of AgNO3 (170 g/mol). Remember:

\[n={m \over MM}\]
Where n is moles, m is mass, and MM is molar mass.

Does that make more sense?

Answer 21

As for your last question, we would need to know the latent heat of condensation of water to be able to answer it. Do you have that value or any other information given?