Finding the mass of iron using the heat equations

[math989]

Homework Statement

Calculate themass of iron at 100C that causes 20.0 kg of water to change temperature from 16C to 18C. C of iron is 460 J/kg C. The C for water is 4190. [/B]

Homework Equations

q1+q2=0
q=mct[/B]

The Attempt at a Solution

q1=-q2
mct=-mct
20(4190)(2)=-m(460)(100)
167600=46000m
3.5=m

 

[Chestermiller]

What's the final temperature of the iron? What was the temperature change of the iron?

Chet

 

[math989]

That's my main issue right now because that is not given to me and I am having a hard time trying to figure how one would do that without the mass being given.

 

[Chestermiller]

That's my main issue right now because that is not given to me and I am having a hard time trying to figure how one would do that without the mass being given.

If you put something hot in contact with something cold and let them equilibrate with one another, do they (a) reach different final temperatures or (b) reach the same final temperature?

Chet