Ox A calorimeter holds 45 g water at 18.0°C. A sample of hot iron is added to the water. The final temperature of the water and iron is 24.0°C. What is the change in en- thalpy associated with the change in the water's temperature? J Note: The specific heat of water is 4.18 g°C Show your work and circle your final answer.

4. INTERNAL ENERGY OF A SYSTEM a. Calculate the change in the internal energy of a liquid system that releases 345 J of heat as a result of absorbing 550 J of work. b. Did the liquid system gain or lose energy?

A 45.90 g sample of pure copper is heated in a test tube to 99.40°C. The copper sample is then transferred to a calorimeter containing 61.04 g of deionized water. The water temperature in the calorimeter rises from 24.51°C to 29.10°C. The specific heat capacity of copper metal and water are J and 4.184 J respectively. g• °C 0.387 g• °C Assuming that heat was transferred from the copper to the water and the calorimeter, determine th heat capacity of the calorimeter. Heat capacity of calorimeter =

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)

A 50.5 g sample of quartz is put into a calorimeter (see sketch at right) that contains 150.0 g of water. The quartz sample starts off at 98.8 °C and the temperature of the water starts off at 15.0 °C. When the temperature of the water stops changing it's 19.5 °C. The pressure remains constant at 1 atm. Calculate the specific heat capacity of quartz according to this experiment. Be sure your answer is rounded to 2 significant digits. J g. °C x10 X S thermometer. insulated container water sample a calorimeter ? ola

Given the following data, calculate the heat transferred in the calorimeter (acal) in J to one decimal place.* Initial temperature of water in calorimeter (°C) Volume of cold deionized water (mL) Volume of hot deionized water (mL) Initial temperature of hot water (°C) Final temperature of water in calorimeter (°C) 18.5 49.7 50.1 40.3 35.2

Consider the following cyclic process carried out in two steps on a gas. Step 1: Step 2: 48 J of heat is added to the gas, and 12 J of expansion work is performed. 66 J of heat is removed from the gas as the gas is compressed back to the initial state. Calculate the work for the gas compression in Step 2. J

A 35.987 g silver cube is heated to 99.5 °C and placed into a beaker containing 100.0 g of water. If initial temperature of the water is 19.8 °C, what is the final temperature of the water and silver cube? The specific heat capacity of the silver is O.235 J/g.°C, and the specific heat capacity of water is 4.18 J/g.°C. Submit your answer below and submit your work for complete credit.

#18

the laboratory a student finds that it takes 101 Joules to increase the temperature of 13.6 grams of solid iodine from 20.6 to 39.3 degrees Celsius. e specific heat of iodine calculated from her data is J/g°C.