Question

I need help can someone help me I don't understand how to do them

Answer 1

@Photon336

Answer 2

i know u need to use the boiling and freezing pint for these problems but none of them look the same

Answer 3

@i don't know how to plug them in

Answer 4

@sweetburger help plz

Answer 5

@Photon336 hey photon i have to go to sleep but whenever u get on could u do 1 or 2 problems any so when i wake up i can see how u did it? thx

Answer 6

@MarcoReus11 it is simply to plug into an equation for you. Let me write it along with it's units:
\[\Large \Delta T_f=K_f \times b \times i\]
Here is:
\(\Delta T_f\): The change in freezing temperature of the solvent. unit: \([K]\)
\(K_f\): The freezing-constant of the solvent. unit:\(\large [\frac{K ~ kg}{mol}]\)
\(b\): The molality of the solute. unit: \(\large [\frac{mol}{kg}]\)
\(i\) The Van't Hoff factor of the solute (how much ions the solute form in dissolved). unit: none

If questions please write and we take a look at it together.

Answer 7

solute form when dissolved*

Answer 8

Are u still here?

Answer 9

It says change in temperature don't I need to subs tract from either 100 or 0 right if they give me the temperature in freezing

Answer 10

Or do I just plug in the temperature they give me

Answer 11

No they want you to calculate how much NaCl you would need to lower the freezing temperature by 2 C of 150 gram of water.
So all you gotta do is to solve for the morality of the solute, to find how many molal NaCl you need. Then from that you can calculate how many gram of NaCl you would need.

Answer 12

Okay I solved I take a pic and show u

Answer 13

Here

Answer 14

@Frostbite help me!!!!!

Answer 15

The issue for me is I can't see any units on the paper you are given.

Answer 16

I converted g to kg

Answer 17

-4.96 to -4960

Answer 18

I mean kg to g

Answer 19

Could u please do like 1 0r 2 problems like 3 and 4 and like me follow them so I can do the others