Wednesday

July 30, 2014

July 30, 2014

Posted by **Chemistry** on Tuesday, October 16, 2007 at 6:45pm.

given values

cp water = 4.184 j/g degree c

cp ice = 2.114 j/g degree c

heat of fusion of ice is 335 J/g

so far, i have this:

(174.36g)(2.114g)(27.5 C)

= 10247 g to three sig figs = 10200 J

is that i calculate the energy required to raise the ice to 0 degrees C?

now i know that the next steps are to find the enrgy required to melt the ice and the energy reuired to cool the water down to 0 degrees C. how do i do those two calculations?

after that i did this to try and melt the ice

q = (mass l H20/molar mass H20)X(335 j/g) the 335 is the heat of fusion.

is that correct? if not, what am i supposed to do?

- Jake -
**DrBob222**, Tuesday, October 16, 2007 at 9:03pmYour 10,247 J I get 10,136 J. Check my arithmetic. THEN, I would keep all the numbers and round at the end; otherwise, it may lead to rounding errors. I'll assume the 10,136 J is correct to move the ice from -27.5 to O

^{o}C.

Then we need to calculate the energy required to cool the liquid water from 21.7 C to zero C. That is

142.38 x 4.184 x 21.7 = check me on this but I get about 13,000 J or so. You do the exact number.

So if you look at the numbers, we can move the ice to zero and move the lqiuid water to zero and have about 3,000 J left in the liquid water. That will melt some of the ice. How much?

q = mass x 335 J/g. Calculate the mass of ice that will melt.

I hope this helps. Check my thinking. Check my work.

**Related Questions**

CHEMISTRY - If 142.38 g of l water at 21.7 degrees C is placed into a syrofoam ...

Chemistry - An ice cube at 0 degrees Celsius was dropped into 30.0g of water in ...

Chemistry - An ice cube at 0 degrees Celsius was dropped into 30.0 g of water in...

Physics - 3. The quantity 0.850kg of ice at -20 degrees Celsius is added to 1....

Chemistry - What is the final temperature after a 11.9 g piece of ice is placed ...

Chemistry. Please help!! - Calculate the final temperature when a 18.7 gram ...

Chemistry - What is the final temperature after a 21.8 g piece of ice is placed ...

Jake - A combustion bomb containing 5.417 g of aluminum metal and 15.974 g of ...

Help me!, Physics - A 60g piece of ice at an intial temperature that is unknown...

PHYSICS 102E - 1. How much ice at -10 degrees Celsius is required to cool a ...