1) A block of copper of unknown mass has an initial temperature of 70.0 C . The
ID: 858132 • Letter: 1
Question
1) A block of copper of unknown mass has an initial temperature of 70.0 C . The copper is immersed in a beaker containing 91.1g of water at 22.6 C . When the two substances reach thermal equilibrium, the final temperature is 24.3 C.
What is the mass of the copper block?
2) A 32.7g iron rod, initially at 21.8 ? C , is submerged into an unknown mass of water at 63.8 ? C , in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 59.6 ? C .
What is the mass of the water?
Explanation / Answer
1. qcopper = q water
m*S*DT = m*S*DT
m* 0.386*(70-24.3) = 91.1*4.184*(24.3-22.6)
mass of Cu = 36.733 grams.
2. qFe = q water
m*S*DT = m*S*DT
32.7*0.45*(59.6-21.8) = m*4.184*(63.8-59.6)
mass of water = 31.653 grams
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.