question 20 CHM 130 Thacker Final Exam Review of Sample Questions Page 2 rue or
ID: 691998 • Letter: Q
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question 20
CHM 130 Thacker Final Exam Review of Sample Questions Page 2 rue or False (continued) 17. The name for Cl:0, is dichlorine heptaoxide. o 18. The volume of 1.00 mole of HBr gas at STP is 22.4 L Mulitple choice questions: 19. The electron configuration of aluminum is represented by: a. 1s 2p b.1s 25 2p'3s'3p d. 1s 2s 2p3s 3p f none above of the following results. Show work/set up for full credit. 120. When 12.00 grams of calcium are heated in air, 17.73 g of calcium oxide is formed. Percent oxygen is which a. b. 28.6% 32.3% C. d. 71.40% 32.30% 28.60% 32.32% 21. In which compound does nitrogen have a +3 oxidation state. a. KNO3 b. Ba(NO3)2 c. N20 d. NHs e. NO2 f. LiNO2 22. An oxide of manganese has the following composition: 53.40 % manganese and 46.60 % oxygen what is the empirical formula of this oxide? Show work for full credit. a. MnC 23, when the reaction is balanced b. MnO3 c. Mn203 d. Mno H2S + 02 S combusting in air with 10.0 g of H2S? a. 0.312 20.0 0 587 e. 3.12 f 0.293 c.Explanation / Answer
1. The name for Cl2O7 is dichlorine heptaoxide : True
2. The volume of 1 mole of HBr at STP is 22.4 L : True
19. electronic configuration os Alumnium is,
d. 1s2 2s2 2p6 3s2 3p1
20. percent oxygen in CaO is = 16g x 100/56.0774 g/mol
a. 28.6%
21. Nitrogen with a +3 oxidation state is,
d. NH3
22. empirical formula,
moles Mn = 53.4 g/55 g/mol = 0.971 mol
moles O = 46 g/16 g/mol = 2.875 mol
divide by smallest factor,
Mn = 0.971/0.971 = 1
O = 2.875/0.971 = 3
Formula = MnO3
b. MnO3
23. balanced equation,
2H2S + 3O2 --> 2SO2 + 2H2O
moles H2S = 10 g/34.1 g/mol = 0.293 mol
moles of SO2 produced = 0.293 mol
f. 0.293
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