Rachel measured the mass of an empty 250cm3 flask. She then filled the flask with a gas of unknown molar mass at an atmospheric pressure of 100kPa and a temperature of 27 degrees. She found that the mass of the flask and contents increased by 0.44 g. Calculate the molar mass of the gas Rachel used to fill the flask​

In a system, when potential energy decreases, then entropy also decreases. true false

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.