Answer to Question #70170 in Chemistry for Desiree Berger

Question

1. Laboratory experiment, 30. J of heat was added to a gas piston assembly as the piston did 75 J of work on it surroundings. Calculate triangle E for the system

2. A 15.0 g piece of graphite is heated to 100.0°C and placed in a calorimeter. The graphite releases 815.1 J of heat to reach a final temperature of 23.9°C. What is the specific heat of graphite?

3. Calculate the standard enthalpy of reaction for the reaction 2 Na(s) + 2 H2O(l)----> 2 NaOH(aq) + H2(g). Standered enthalpies of formation are -285.8 kJ/Mom for H2O(l) and -470.11 kJ/mol for NaOH(aq)