(A) Na (s) + H 2 O (l) → NaOH (aq) + H 2 (g)
(B) I 2 (g) → I 2 (s)
(C) H 2 SO 4 (aq) + Ba(OH) 2 (aq) → BaSO 4 (s) + H 2 O (l)
(D) H 2 (g) + 1/2 O 2 (g) → H 2 O (l)
(E) None of the above62 . Which of the following compounds contains the greatest percentage of oxygen by weight?
(A) C 3 H 6 O 5 Cl
(B) C 3 H 6 O 2
(C) C 5 H 10 O 5
(D) C 4 H 8 O 3
(E) They are all equal.63 . In the reaction 2SO 2 + O 2 → 2SO 3 , 0.25 mole of sulfur dioxide is mixed with 0.25 mole of
oxygen and allowed to react. What is the maximum number of moles of SO 3 that can be
produced?
(A) 0.0625 mole
(B) 0.125 mole
(C) 0.25 mole
(D) 0.5 mole
(E) 1.0 mole64 . What happens to the pH of a buffer system if one halves the concentration of both the
acid and the salt?