5) In concentrated sulfuric acid, ethanol (CH 3 CH 2 OH) forms diethyl ether (CH

Question

5)   In concentrated sulfuric acid, ethanol (CH3CH2OH) forms diethyl ether (CH3CH2OCH2CH3) and water according to the reaction

2 CH3CH2OH ? CH3CH2OCH2CH3 + H2O

In a side reaction, some ethanol forms ethylene (CH2CH2) and water

CH3CH2OH ? CH2CH2 + H2O

In a given experiment, 50 g of ethanol yielded 33.9 g of diethyl ether and 50% of the ethanol that did not produce diethyl ether reacted according to the side reaction to form ethylene. What mass of ethylene was produced?

A) 1.2 g           B) 2.4 g           C) 5.6 g           D) 10.2 g         E) 15.9 g

7)   A mixture of argon and CO2 has a total pressure of 2 atm in a volume of 3.0 L at 100oC.  The CO2 is completely removed from the mixture by passing it through a solution of sodium hydroxide. The argon was then collected in a 3.0 L vessel and its pressure was found to be 755 mmHg at a temperature of 25oC. What was the partial pressure of CO2 in the original gas mixture?

A) 0.77 atm     B) 0.12 atm     C) 0.23 atm     D) 0.32 atm     E) 0.54 atm

8)   A mixture of acetylene (C2H2) and carbon monoxide (CO) in sealed vessel has a pressure of 1.2 atm at 100oC. The mixture is burned in an excess of O2.The total pressure of the gaseous CO2 and H2O produced by combustion was measured in the original vessel at 100oC. At these conditions the total pressure of the CO2 and H2O gas mixture was found to be 2.88 atm. What was the partial pressure of CO in the original mixture?

A) 0.84 atm     B) 0.63 atm     C) 0.23 atm     D) 0.36 atm     E) 1.00 atm

Explanation / Answer

1) D

7) A

8)D

with regards

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