Define the system to be a container full of steam. If the steam condenses, did the system hae a positive or negative entropy change?

A tank has 2 ?? of saturated water at 100 ???.  It is heated until it is 400°C.  What is the change in entropy of the water/vapor inside the tank? You can use: https://irc.wisc.edu/properties/

An adiabatic vessel has a valve that allows some water to be released. Initially it has 500 Kg of saturated liquid wate at a temperature of 50°C. Find the following: The temperature of remaining water if 10 Kg of water vapor escapes through the valve. If the remaining water is at 20°C, find the amount of water escaped as vapor. Assume specific heat of water, C = 4 Kj/Kg-K and Enthalpy of vaporization of water, AHvap 2400 Kj/Kg

Steam expands in a turbine from 6 Mpa and 500 Celsius to 0.2 Mpa and 150 Celsius at a rate of 1.2kg/s. Heat is lost from the turbine at a rate of 34KJ/s during the process. Find the power output of the turbine.