An ideal gas occupies a volume of 0.3 m3 at the pressure of 400 kPa. If the volume changes to 0.85 m3 and the temperature remains constant, what is the pressure of the gas? Give answer in kPa.
If 500 cal of heat are added to a gas, and the gas expands doing 394 J of work on its surroundings, what is the change in the internal energy of the gas in Joules.
150 g of a certain metal, initially at 100o C is dropped into an insulated beaker containing 100 g of water at 20o C. The final temperature of the metal and water in the beaker is measured at 43o C. What is the specific heat capacity of the metal in cal/(g o C)?
W = P*deltaV
Q = mcdeltaT
The Attempt at a Solution
I have no idea what's going on with any of these problems... if anyone can help me I would be awesomely grateful.