61. Which set of coefficients properly balances the equation for the combustion of ethane? __ethane(g) + __oxygen(g) → __carbon dioxide(g) + __water(g) (A) 1, 7, 2, 3 (B) 1, 2, 1, 2 (C) 2, 7, 4, 6 (D) 1, 4, 1, 2

55. Which methods will help us to distinguish between equimolar solutions of a strong base and a strong acid? I. Add magnesium to each solution and look for the formation of gas bubbles . II. Add aqueous sodium hydroxide to each solution and measure the temperature change. III. Measure the electrical conductivity of each solutions. (A) I and II only (B) I and III only (C) II and III only (D) I, II, and III

61. Which set of coefficients properly balances the equation for the combustion of ethane? ethane(g) + oxygen(g) → carbon dioxide(g) + water(g)
(A) 1, 7, 2, 3
(B) 1, 2, 1, 2
(C) 2, 7, 4, 6
(D) 1, 4, 1, 2

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