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9. What is the oxidation number of chromium in dichromate and what is the reducing agent...

9. What is the oxidation number of chromium in dichromate and what is the reducing agent in this reaction?

Oxidation Number Reducing Agent A.     +3 Cr2O72- B.     +6 C2H5OH   C.    +3 Cr3+   D.    +6 CO2

10. What mass of ethanol (MM = 46.06 g/mol) is present in a sample of blood if 17.73 mL of a 0.1192 M dichromate solution is required to completely react the ethanol in the sample?

A.    0.09734 g
B.    0.04867 g
C.    0.1947 g
D.    0.001615 g



11. For a sample of gas, if the volume of the gas is increased by a factor of two while   the absolute temperature of the gas is halved, what happens to the pressure?

A. The pressure increases by a factor of two   B. The pressure decreases by a factor of two   C. The pressure remains constant   D. The pressure decreases by a factor of four


12. At STP, a sample of carbon dioxide occupies a total volume of 76.2 L. What is the mass of the gas sample?

A. 150. g CO2 B. 137 g CO2 C. 95.2 g CO2 D. 1.48 g CO2  

13. A molecule has an empirical formula of CH2. In the gas phase it has a density of 1.65 g/L at 300. K and 0.966 atm. What is its molecular formula?

A. CH2 (14 g/mol)     B. C2H4 (28 g/mol)   C. C3H6 (42 g/mol)   D. C5H10 (70 g/mol)

14. The thermal decomposition of solid KClO3 occurs with the production of KCl and O2 gas. If 435 mL gas was collected over water at 30°C, how many moles of gas were produced?

Patm (at time of collection) = 722 torr         Pwater vapor (at 30°C) = 31.9 torr

A.   0.0120 mol B.   0.0159 mol C.   0.0166 mol D.   0.161 mol

15. What volume of gaseous products is formed at 300. °C and 2.00 atm if 1.00 mol of solid NH4NO3 completely decomposes?

   2 NH4NO3 (s)   →   2 N2(g) + O2(g) + 4 H2O(g) [balanced]

A. 23.5 L   B. 43.1 L   C. 70.6 L   D. 82.3 L

17. The diffusion rate of an unknown gas is 31.50 mL/min. Under identical experimental conditions the diffusion rate of oxygen gas is 30.50 mL/min. Which of the following could be the unknown gas?

A. Nitrogen monoxide (30 g/mol)      B.   Hydrogen fluoride (20 g/mol)   C.   Carbon dioxide (44 g/mol)   D.   Fluorine (38 g/mol)

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