Oxygen forms an ion with a charge of ________.
A) 2-
B) 2+
C) 3-
D) 3+
E) 6+
Question 2
Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide:
4Al (s) + 3O2 (g) 2Al2O3 (s)
The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is ________ g.
A) 9.4
B) 7.4
C) 4.7
D) 5.3
E) 5.0
Question 3
At elevated temperatures, dinitrogen pentoxide decomposes to nitrogen dioxide and oxygen:
2N2O5(g) 4NO2 (g) + O2 (g)
When the rate of formation of O2 is 2.2 10-4 M/s, the rate of decomposition of N2O5 is ________ M/s.
A) 7.2 10-3
B) 3.6 10-3
C) 1.8 10-3
D) 1.4 10-2
E) 0.00090
Question 4
What is the maximum amount in grams of SO3 that can be produced by the reaction of 1.0 g of S with of O2 via the equation below? S (s) + O2 (g) SO3 (g) (not balanced)
A) 0.27
B) 1.7
C) 2.5
D) 3.8
E) 2.0
Question 5
The pH of a solution prepared by dissolving 0.350 mol of solid dimethylamine hydrochloride ((CH3 )2NH2Cl) in 1.00 L of 1.10 M dimethylamine ((CH3 )2NH) is ________. The Kb for methylamine is 5.40 10-4. (Assume the final volume is 1.00 L.)
A) 1.66
B) 2.77
C) 11.23
D) 11.14
E) none of the above
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