#3ADVANCED CALORIMETRY
Use the table below as well as your reference tables to answer the following questions (in all cases assume a closed system)
SubstanceSpecific Heat (J/g*˚C) q = m x C x DT
water4.18if temperature is changing
ethanol2.4
ice2.1q = m x Hf (Hf of water = 334 J/g)
steam1.7if melting or freezing is occurring
chloroform0.96
aluminum0.90q = m x Hv (Hv of water = 2260 J/g)
iron0.46if boiling or condensing is occurring
silver0.24
mercury0.14 -qlost = qgained
1.A certain mass of pure ethanol at a temperature of 25.0˚C is mixed with 200. g of water at
75.0 ˚C. The final temperature of the mixture is 50.0˚C. What was the mass of the ethanol.
2.A piece of an unknown metal with a mass of 23.8 grams is heated to 100.0˚C and dropped
into 50.0 mL of water at 24.00˚C. The final temperature of the mixture is 32.5˚C. What is the
specific heat of the metal?
3.If 10.0 grams of water at 50.0˚C is mixed with an unknown mass of water at 100.0˚C and the final temperature of the mixture is 95.0˚C. What was the mass of the added water?
4.A 50.0 gram sample of aluminum at 80.0˚C is placed on a large block of ice at 0.0˚C. By the time
the aluminum has cooled to 0.0˚C, a certain amount of ice has changed to water at 0.0˚C. Calculate the mass of melted ice.
5.How much water at 100.0˚C must be added to 900.0 grams of water at 20.0˚C to achieve a final temperature of 40.0˚C
6.How much heat energy would be required to turn 5.0 grams ice at a temperature of -20.0˚C to
liquid at 50.0˚C? hint: you must use all three heat equations to solve this question
7.How much heat energy would have to be added to turn the liquid water formed in question (6)
into steam at a temperature of 100.0˚C?
8.What is the final temperature when 1000. grams of mercury at 100.0˚C is mixed with 100.0 grams
of water at 10.0˚C?
9.What is the final temperature of the mixture when 10.0 grams of aluminum at 175˚C is placed
in 200. mL of water at 25.0˚C
10.If a piece of silver with a mass of 65.6 grams and a temperature of 100.0˚C is dropped into
25.0 mL of water at 23.0˚C, what will be the final temperature of the system?