Please Help and Thank you! I keep getting the same answers each time I attempt to solve these questions but I keep getting them wrong. I don't know what I am doing wrong.

1. What is w when 3.31 kg of H₂O(l), initially at 25.0 C, is converted into water vapour at 151 C against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. Remember to include a "+" or "" sign if appropriate. Enter your answer in acceptable SI units, accurate to 3 significant figures.

( I have tried both -193 J and +193 J but both incorrect )

2. What is the internal energy change for the system if 959 joules of heat flow from the system into the surroundings and 429 joules of work is done by the system on the surroundings?

( I got +1388 and +530 but both answers were incorrect )

3. A sample of gas absorbs exactly 803 J of heat from its surroundings. At the same time, the gas expands from 4.65 L to 11.91 L against a constant external pressure of 0.961 atm. What is the internal energy change for the gas? Answer in Joules and to 3 significant figures ... my answer = 96.0 J

4.

Which of the following statements is/are true? You may select more than one, or none, of the options.

		Suniv = 0 for an adiabatic process.
		Suniv = 0 for a reversible process.
		Ssurr = 0 for a reversible process.
		Ssurr = 0 for an adiabatic process.
		S = 0 for a reversible process.
		S = 0 for an adiabatic process.