Question

Assuming the water vapour to be a perfect gas, calculate the internal energy change when 1 mol of water at 100°C and 1 bar pressure is converted to ice at 0°C. Given the enthalpy of fusion of ice is 6.00 kJ mol-1 heat capacity of water is 4.2 J/g°C

Calculate the enthalpy change on freezing of 1.0 mol of water at10.0°C to ice at –10.0°C. ∆fusH = 6.03 kJ mol–1 at 0°C. Cp [H2O(l)] = 75.3 J mol–1 K–1 Cp [H2O(s)] = 36.8 J mol–1 K–1

When work is done on system or by a system there is a change in _________

In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in the internal energy for the process?