# Final Exam Review Practice test 3 (some acidbase, moles

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```					Final Exam Review: Practice test 3 (some acid/base, moles, stoichiometry, empirical
formula, types of reactions, some thermo)

1. How many moles of carbon are in two moles of glucose ( C6H12O6)? (Molar Mass:
C6H12O6=180.18 g/mole) (a) 2 (b) 6 (c) 12 (d) 36 (e) 360.36

2. How many moles of phosphate ion (PO43-) are in 3.4 moles of magnesium phosphate
Mg3(PO4)2 ? (Molar mass: PO43- =94.97 g/ mole; Mg3(PO4)2 =167.87 g/ mole) (a) 2.0 (b)
3.0 (c) 3.4 (d) 6.8 (e) 570.8

3. What is the empirical formula of halothane, an anesthetic. The molecular formula is
C2HBrClF3. (a) CHBrClF (b) C2HBrClF3 (c) C4H2Br2Cl2F6 (d) C4H2X10

4. In small quantities, the nicotine in tobacco is addictive. In large quantities, it is a
deadly poison. What is the molecular formula of nicotine? The empirical formula is
C5H7N2 and the molecular weight is between 185 and 195 g/mol (a) CHN (b) C5H7N2 (c)
C10H14N4 (d) C15H21N6 (e) unable to determine from the given information

Questions 5 has an unbalanced equation.

First balance the equation using the smallest whole number possible. After balancing the

5. ____ (NH4)2Cr2O7 (s)     ____ Cr2O3 (s) + ____ N2 (g) + ____ H2O (g)

What is the sum of all of the coefficients in the balanced equation? (a) 5 (b) 6 (c) 7 (d) 10
(e) 14

6. 2 Al + 3 Sn(NO3)2             2 Al(NO3)3 + 3 Sn This equation is an example of which
type of reaction? (a) single replacement (b) double replacement (c) combination (d)
decomposition

7. According to an activity series will the above reaction take place? (a) no (b) yes (c)
unable to determine

8. 6 K2O +P4O10             4 K3PO4 This equation is an example of which type of
reaction? (a) single replacement (b) double replacement (c) combination (d)
decomposition

9. In class a double displacement reaction was done as a demonstration. A solution of
potassium iodide and a solution of lead (II) nitrate were combined. A precipitate formed
as a product. What color was the precipitate? (a) white (b) yellow (c) black (d) red (e) I
wasn't in class
10. Which of the following is NOT a characteristic of a base? (a) a pH greater than 7 (b)
bitter taste (c) turns red litmus blue (d) feels slippery (soapy) (e) all of the above are
characteristics of a base

12. Is the ion HPO42- an amphoteric substance? (a) yes (b) no (c) unable to determine
from the given information

16. Given the reaction :

4 Fe(s) + 3 O2    2 Fe2O3(s)

How many moles of Oxygen are neede to completely react with 0.345 moles of iron?
(Molar Mass Fe = 55.85 g/mol; O2 = 32.00 g/mol; Fe2O3 = 159.7 g/mol)(a) 0.115 moles
(b) 0.259 moles (c) 0.460 moles (d) 0.518 moles e) 1.04 moles

17. Given the following reaction:

2 C8H18 + 7 O2       3 C3H8 + 6 CO + 6 H2O + CO2

How many grams of CO are produced by the reaction of 20.0 grams of C8H18?

(Molar mass: C8H18=114.26 g/ mole; O2=32.00 g/ mole; C3H8=44.08 g/ mole; CO
=28.01 g/ mole; H2O=18.01 g/ mole; CO2 =44.01 g/ mole) (a) 0.0877 g (b) 0.526 g (c)
2.46 g (d) 14.7 g (e) 60.0 g

18. How many grams of HCl are produced when 10.0 g of Cl2and 1.00 g H2 reaact
(Molar mass: H2= 2.016g/mol; HCl= 70.90 g/mol)
H2 (g) + Cl2 (g) 2 HCl(g)

(a) 9.04 g (b) 10.3 g (c) 11.0 g(d) 18.1 g (e) 36.1 g

19. What would happen to the amount of HCl produced in the previous question if the
amount of H2 is doubled?(a) it would decrease more than a factor of two(b) it would
decrease by a factor of two(c) it would remain the same(d) it would increase by a factor
of two(e) it would increase by a factor more than two

20. Given the reaction:

2 S + 3 O2    2 SO3

If you started with 5.0 moles of sulfur and you produced 351 g of sulfur trioxide, what is
your percent yield?(Molar mass: S= 32.06 g/mol; O2= 32.00 g/mol; SO3= 80.06 g/mol)

(a) 44%(b) 88%(c) 93%(d) 100%(e) unable to determine from the given information
21. An endothermic reaction is one in which (a) heat is a reactant(b) heat is a product(c)
heat is a catalyst(d) heat is an interference

22. Aspartame, also kown as Nutrasweet, is 160 times sweeter than sugar when
dissolved in water. Calculate the emperical formula of aspartame is the compound

is 57.14% C, 6.16% H, 9.52% N, and 27.18% O

(Molar Mass: C= 12.01 g/mol; H= 1.008 g/mol; N= 14.01 g/mol; O= 16.00 g/mol)

(a) CHNO(b) C7H9NO3(c) C14H18N2O5(d) C14H18N2O6(e) C28H36N4O12

1. C    2. D    3. B    4. C   5. C

6. A    7. B    8. C    9. B   10. E

11. C 12. A 13. B 14. D 15. B

16. B 17. D 18. B 19. C 20. B

21. A 22. C

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