chemistry
posted by Lilit*** on .
If a 5.26g sample of copper at 258 °C is placed in 125 mL of water at 21.0 °C, how hot will the water get? Assume no heat loss to the surroundings. The specific heat of copper is 0.385 J/g °C.

The sum of heats gained is zero (one heat gained will be negative, a loss)
HeatgainedCu+ Heatgainedwater=0
MassCu*specheatCu*(Tf258)+masswater*cw(Tf21)=0
solve for Tf 
how do u solve for Tf