0.75kg of air has a pressure of 3bar and a temperature of 125oC , After it has received 900kj of heat at constant volume, find the final temperature and pressureIf the air then expands adiabatically doing 915kj of work,by how much is its internal energy changed during the expansion(b) is the value lower or higher before the heating process

A rigid closed tank contains refrigerant 134a wnich is initially with a temperaf lure of D'C and a quality Of Ce0% . An electrical resistor inistalled inside the Fank transfers heat energy to the refrigerant at a rate Of 2 kW until the tånk contains only saturated vapor. if the tank is well - insulated and the mass Of the refrigerant is 1.5 kg, determine the time it takes for the process to be completed in seconds using 5 signifigant figures. a two- phase liquid - vapor muture

i need the answer quickly

Consider a balloon contains initially 40 liter of Helium at 105 kPa and 20 oC, The balloonis connected to a supply line of helium through a valve that is opened allowing helium tofurther fill the balloon to 150 kPa such that pressure in the balloon is expressed as: P =750 V0.5– 45, Where P is in kPa and V is m3. Considering Helium as ideal gas:a- Find the mass of Helium entered the balloon if the process is isothermal.b- Find the work done during the process.