8. 98.3 J of heat is supplied to 12.28 g of a substance, and its temperature rises by 5.42°C. What is the specific
heat of the substance?
9. 755 J of heat is supplied to 34.0 g of water, and an additional 755 J of heat is supplied to 34.0 g of iron. If
both samples are originally at 20.0°C, calculate the final temperature of the water and the iron. Comment on
the difference in your answers, and explain why water is used as a coolant in a car radiator.
10. A quantity of ethanol is cooled from 47.9°C to 12.3°C and releases 3.12 kJ of heat. What is the mass of the
ethanol sample?
11. How much heat is absorbed as 7.56 g of ice is heated from –30.0°C to its normal melting point?
12. A 25.70 g bar of gold at 23.20°C is brought into direct contact with a 19.87 g bar of silver at 81.93°C. Heat is
allowed to flow from the silver to the gold until both are at the same temperature. Assuming no heat is lost to
the surroundings, calculate the final temperature of the metals.