24. As indicated by Lewis structures, which of the following would probably not exist as a stable molecule? (A) CH2O (B) C2H4O (C) C3H6O (D) C4H8O

30. One mole of an ideal gas is expanded from a volume of 1.00 liter to a volume of 20.00 liters against a constant external pressure of 1.00 atm. How much work (in joules) is performed on the surroundings? (T = 300 k; 1 L atm = 101.3 J) (A) 456 J (B) 912 J (C) 1925 J (D) 2870 J