Question

If 45g of LiF dissolved in 1.8kg of water, what would be the expected change in boiling point? The boiling point constant for water (Kb) is 0.51 degrees C/m.
- 0.49 degrees C
- 0.98 degrees C
- 1.9 degrees C
- 3.5 degrees C
Im not sure which one it is I got both 0.49 and 0.98 Please Help. I will medal.

Answer 1

What calculations did you perform?

Answer 2

I ended up going with the first answer 0.49 based on my calculations

Answer 3

did you have \(\large \Delta T=i*K_b*m=2*(0.51~^oC/m)*\dfrac{(\frac{45~g}{25.9~g/mol})}{1.8~kg}\)

Answer 4

No and when I solve yours I get 25 which isn't a choice

Answer 5

you're solving it incorrectly, because i get 0.984555984555984583356

Answer 6

I'm so lost

Answer 7

I don't know who's right

Answer 8

I'm right lol you got 0.49 because you didn't take into account that i=2

Answer 9

Okay thank you so much

Answer 10

CaN I ask another

Answer 11

no problem, and sure, shoot.

Answer 12

A 65 gram of some unknown metal at 100.0 deg C is added to 100.8grams at 22 degrees Celsius. The temperature of the water rises 27.0 degrees C. Of the specific heat capacity of liquid water is 4.18 J/degC*g, what is the specific heat of the metal?

Answer 13

The choices are
-2.25 J/(C*g)
-1.75 J/(C*g)
-0.444 J/(C*g)
-0.324 J/(C*g)

Answer 14

I don't know Where to start @arronq and how to get the answer

Answer 15

So this is a little complicated but bare with me.

First you use the mass of the water, the specific heat capacity and the change of temperature the water had to find the heat lost by the metal.

Now that you have the heat lost by the metal, you can use the mass of the metal and the temperature change of the metal (along with the heat you found in the first part) to solve for the specific heat capacity.

The equation is \(\sf q=m*C_p*\Delta T\)

q= heat
m=mass
Cp=specific heat capacity
\(\Delta T\)=change in Temp

Answer 16

Based on what your saying and what I do know I'm getting 0.444 with my calculations. Is that correct?

Answer 17

show your calculations

Answer 18

I can't I don't have a camera and my computers to old to type them in

Answer 19

so how am i supposed to see if you're doing it right?

Answer 20

I think I am I just need to double check the final response with you and if I get it wrong I'll try it a different way until I'm doing it right

Answer 21

its right

Answer 22

Okay thank you so much

Answer 23

no problem