A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 3.20 kg of water at 31.2 °C. During the reaction 91.3 kJ of heat flows out of the bath and into the flask. Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is 4.18 J-g '·K Round your answer to 3 significant digits.

An insulated container is used to hold 42.7 g of water at 20.5 Celsius. A sample of copper weighing 9.60 g is placed in a dry test tube and heated for 30 minutes in a boiling water bath at 100.0 Celsius. The heated test tube is carefully removed from the water bath with laboratory tongs and inclined so that the copper slides into the water in the insulated container. Given that the specific heat of solid copper is 0.385 J/(g.Celsius), calculate the maximum temperature of the water in the insulated container after the copper metal is added.

An electrical heater is used to supply 235.0 J of energy to a 15.0 g sample of water, originally at 295.0 K. Determine the final temperature in degrees Kelvin. (the specific heat capacity for water is 75.291 Jmol-1K-1)

Calculate the energy required to heat  180.0g  of iron from  1.3°C  to  11.2°C . Assume the specific heat capacity of iron under these conditions is  ·0.449J·g−1K−1  . Be sure your answer has the correct number of significant digits.