AP Chemistry Directions
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Spectrum A
Spectrum B
7
100
80
100
80
60
40
2011
60
40
20
0
Which of the spectra shown could represent the isotopic composition of an
unknown element that has an average atomic mass of 25.5 amu?
0
22 23 24 25 26 27
22 23 24 25 26 27
A Spectrum A
Relative Abundance (%) Relative Abundance (%)
Atomic Mass (amu)
Relative Abundance (%) Relative Abundance (%)
Atomic Mass (amu)
Spectrum C
100-
80
® Spectrum B
60
Spectrum D
100
80
60
40
20
01
22 23 24 25 26 27
© Spectrum C
40
20
0
II
22 23 24 25 26 27
D Spectrum D
Atomic Mass (amu)
Atomic Mass (amu)

1.aluminum chloride (alcl3), and sodium hydroxide (naoh) can react to form aluminum hydroxide (al(oh)3) and sodium chloride (nacl).    you have 13.4 g of aluminum chloride and 10.0 g of sodium hydroxide. answer the following questions: •what is the balanced equation for this reaction? •if you use all 13.4 g of aluminum chloride, how many grams of aluminum hydroxide can be formed? work must be shown to earn credit •if you use all 10.0 g of sodium hydroxide, how many grams of aluminum hydroxide can be formed? work must be shown to earn credit •how many grams of aluminum hydroxide will actually be made?     which reagent is limiting? explain your answer.

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2

Count the number of each type of atom in the equation below, and then balance the equation. write in the numbers of atoms and coefficients. add a 1 if there should be no coefficient. cs2(l) + o2(g) → co2(g) + so2(g) c [ ] s [ ] o > c [ ] s [ ] o [ ] cs2(l) + [ ] o2(g) > [ ] co2(g) + [ ] so2(g)