Tuesday

October 21, 2014

October 21, 2014

Posted by **Lindsay** on Monday, May 14, 2007 at 5:51pm.

What is the final temp. (in degrees C) after a 15.5 g piece of ice at 0 degrees C is placed into a styrofoam cup with 125.0 g of water initially at 72.0 degrees C? Assume no loss or gain of heat from the surroundings.

So I know that the molar enthalpy heat of fusion is 333 J/g, and the specific heat of water is 4.184 J/gK. Is this simply about rearranging the specific heat equation, or is it more than just that?

q to melt ice + q raise temp of water from zero to final T + heat lost by water at 72 = 0

(15.5 x 334 J/g*K) + 15.5*4.184*(Tf-Ti) + 125.0*4.184*(Tf-Ti) = 0

Tf is final T

Ti is initial T

Solve for Tf.

Ok so I see what you're saying. But honestly, I have no idea how to go about solving for Tf.

Can u give me a hint?

Perhaps the structure is confusing. I posted the equation. All that's left is doing the algebra.

(15.5 x 334) + [15.5 x 4.184 x (Tf -0)] + [125.0 x 4.184 x (Tf - 72)] = 0

There is only one unknown, Tf. Solve for Tf = T final

Ahh ok I see, I got it.

Thanks again for all of your help! I still have quite a few Chem questions I'm unsure about, but I think I'll call it good for tonight. :)

**Answer this Question**

**Related Questions**

Physics - I'm stuck on this problem. "You mix 100 ml 60 degree C water with ...

Chemistry - Find the enthalpy of combustion of magnesium using Hess' law given ...

Chemistry - It took 400 calories of heat to raise 50 mL of water from 20 degrees...

Chem - If it takes 600 calories of heat to raise 75ml of water to a final temp ...

DISCRETE MATH - my teacher gave us this question and i am totally confused on ...

chemistry - mass of the metal 7.26g volume of water in the calorimeter 10mL ...

Math 4 - Temp. In degrees is 19 degrees Fahrenheit. A blizzard moved in and ...

Chemistry - 2 HCl (aq) + Ba (OH2) (aq) ----> BaCl2 + 2 H20 (l) deltaH = -118 ...

AP Chemistry - I know this is such an easy question, but I completely forgot how...

chemistry - a balloonist is preparing a trip in a helium balloon. the trip ...