Posted by Phillip on Sunday, April 24, 2011 at 5:50pm.
A 32.5g cube of aluminum initially at 45.8 C is submerged into 105.3g water at 15.4 C. What is the final temp of both substances at thermal equilibrium. Assume the al and the H2O are thermally isolated from everything else)
Specific heat cap Al= .903
Specific heat cap H2O= 4.18
I understand this problem but In my math i get to:
(DeltaT) Al = 14.998 X (DeltaT) H2O
And im lost. Anyone able to explain the completion of the problem? Any help is greatly appreciated

Chemistry  DrBob222, Sunday, April 24, 2011 at 6:15pm
You need to use TfinalTinitial for delta T.
heat lost by Al + heat gained by water=0
[mass Al x specific heat Al x (TfinalTinitial)] + [mass H2O x specific heat H2O x (TfinalTinitial)] = 0
Substitute and solve for Tf.

Chemistry  Phillip, Sunday, April 24, 2011 at 6:23pm
I'm having trouble once i get to
T(final)=14.998 X T(final) + 14.998 X T(initial h2o) + T(initial Al)
Any suggestions?

Chemistry  DrBob222, Sunday, April 24, 2011 at 6:45pm
Yes. I think it is tough to try to manipulate the algebra. It is much easier to substitute the numbers first and manipulate them.
[32.5 x 0.903 x (Tf45.8)]+[105.3 x 4.18 x (Tf15.4)] = 0
29.35Tf  1344.1 + 440.15Tf  6778.4 = 0
Check those numbers to make sure I didn't make an error on my calculator, then solve for Tf.

Chemistry  Phillip, Sunday, April 24, 2011 at 7:05pm
Thank you so much DrBob!
I ended up with
469.5Tf = 8122.54
Tf = 17.3
Thanks again,
Phil
Answer This Question
Related Questions
 Chemistry  When 4.62 mL of cold water at 22.6 °C is mixed with 37.5 mL of hot ...
 Chemistry  A hot lump of 25.6 g of aluminum at an initial temperature of 57.4 °...
 Chemistry  A hot lump of 25.6 g of aluminum at an initial temperature of 57.4 °...
 Chemistry  Will someone show me the formula or help me through working this ...
 chem  A 25.0 g aluminum block is warmed to 65.2 C and plunged into an insulated...
 physic  What mass of water at 22.0 °C must be allowed to come to thermal ...
 physic  Hi! Help me please, thank you so much. What mass of water at 28.0 °C ...
 Chemistry  a 15.7 g aluminum block is warmed to 53.2 degrees celsius and ...
 Physics  a): Two 50 g ice cubes are dropped into 200 g of water in a thermally...
 Chemistry  A 35.0g iron rod, initially at 25.6°C, is submerged into an unknown...
More Related Questions