Chemistry Class Question...?

I have a question on this question for my chem class. The iniitial question is 45.5 g of copper at 99.8 deg C is dropped into a beaker containing 152g of water at 18.5 C. What is the fianl temp when the thermal equilibrium is reached? Now i have it down to [(4.184 J/g K)(152g)(T Final-291.5K) + (.385J/g)(45.5g)(T final-372.8K)]=0, but I'm stumped when it comes to finding the final temp.. Please help.

Answer:
remember at equilibrium, the temperatures are the same so....

[(4.184 J/g K)(152g)(T Final-291.5K) + (.385J/g)(45.5g)(T final-372.8K)]=0

subtract (.385J/g)(45.5g)(T final-372.8K) from both sides


(4.184 J/g K)(152g)(T Final-291.5K)= -(.385J/g)(45.5g)(T final-372.8K)

multiplying it out gives us (i rounded to tenths)

635.9*Tf - 185385 = -17.5Tf + 6530.5

getting Tf on same side...

653.5*Tf = 191915.2

and

Tf = 293.7

Hope thats right!
  • Can someone please tell me if theres a scientific name for glass like h20 is for water?
  • Calculate the density of Br2 (g) at 59.0 °C and 1.00 atm pressure??
  • Buffer solutions?
  • 2. Use the van der Waals equation to calculate:?
  • Write a balanced chemical equation for the reaction of hydroiodic acid, HI, with {KOH} & {NaHCO3}.?
  • NaOCl + fermented organic matter or sewage ----->?
  • Which of the following substances is made up of many monomers joined together in long chains?
  • What is the lightest and safest element for use in weather balloons?