Thursday

November 27, 2014

November 27, 2014

Posted by **Jake** on Wednesday, January 2, 2008 at 9:12pm.

this is all i have so far. please help? thanks

H capacity H20 (s) = 2.08 J/g C

H capacity H20 (l) = 4.18 J/g C

ethanply of fusion of ice =6.02 KJ/mol.

- AP CHEM -
**bobpursley**, Wednesday, January 2, 2008 at 9:34pmYou have the mass of the water to be frozen, figure the heat lost to convert it to ice at -5C.

You will have to watch units, on the heat of fusion, convert that to J/g.

Then, the heat lost has to equal the heat gained, or

Massfreon*Heatvap= heat lost

- AP CHEM -
**DrBob222**, Wednesday, January 2, 2008 at 9:34pmmass of water = 30g x 18 cubes = 540 g.

heat required to lower T of water from 22 to zero is mass x 4.18 x 22 = xx

heat required to freeze 540 g water is

mass x heat of fusion water = yy

heat required to lower T of 540 g ice from zero to -5 is mass x 2.08 x 5 = zz

Total heat required to lower T of 540 g water from 22 to -5 C is xx + yy + zz.

What do you have to do this job? You have a refrigerant which soaks up 158 J for each gram of the stuff used. So how many grams does it take to equal the total heat required from above?

Check my thinking. Check my work.

**Answer this Question**

**Related Questions**

math - A 12 cm by 12 cm ice cube tray is in the shape of a cuboid with twelve ...

Math - A 12 cm by 12 cm ice cube tray is in the shape of a cuboid with twelve ...

Math - A 12 cm by 12 cm ice cube tray is in the shape of a cuboid with twelve ...

math - Mr. Cline needs 36 ice cubes for the science experiment. Eack ice tray ...

chemistry - in a freezer, 150g of water at 0degrees celcius is placed in an ice ...

math - A 12 cm by 12 cm ice cube tray is in the shape of a cuboid with twelve ...

Physics - Trying to beat the heat of summer, a physics grad student went to the ...

chem - .You have an ice cube that is 150 g and is at a temperature of 0°C. You ...

Physics/chem - Trying to beat the heat of summer, a physics grad student went to...

Maths - a tray holds 2.3 liters of water when full (2300 cm3) Calculate the ...