An unknown molecule contains only sulfur atoms. Suppose 1 L ofvapor of this 20) molecule is reacted with sufMicient oxygen at 1atm and 500 °C to produce 8 L of SO2 gas. How many sulfur atomsdoes the unknown molecule contain in the vapor phase?
A) 8 B) 3 C) 2 D) 4 E) 6
If one mole of water (~18 mL, the system) is vaporized fromliquid to gas at 100o C, the amount of work done on thesurroundings is 2.5 kJ, while the change in internal energy for thesystem is 38.2 kJ/mol. What is the amount of heat required tovaporize one mole of water?
A) 38.2 kJ B) 35.7 kJ C) O40.7 kJ D) 40.7 kJ E) O35.7 kJ
One mole of an ideal gas is expanded from a volume of 1.00 L toa volume of 10.00 L against a constant external pressure of 1.00atm. How much work (in joules) is performed on thesurroundings?
A) 456 J B) 912 J C) 0.013 J D) 2740 J E) 2870 J
PLEASE SHOW WORK
