Question 3 (3 points) A 29.96 g sample of Argon gas in a cylinder expands from 0.500 L to 1.250 L against an external pressure of 0.950 atm. Calculate Wsys and express your result in Joules. Note: 1 atm[]L = 101.3 J O +0.713 -72.2 +72.2 -0.713 Question 4 (3 points) The AH for the dissolution process when solid sodium hydroxide dissolves in water is -44.4 kJ/mol. What is the change in enthalpy if 75.1 g of sodium hydroxide is dissolved? -44.4 kJ 44.4 kJ 03330 kJ -83.4 kJ -3330 kJ 83.4 kJ