± Hydrogen Cyanide Poisoning Hydrogen cyanide, HCN, is a poisonous gas. The leth

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± Hydrogen Cyanide Poisoning

Hydrogen cyanide, HCN, is a poisonous gas. The lethal dose is approximately 300. mg HCN per kilogram of air when inhaled. The density of air at 26 C is 0.00118 g/cm3.

Part A

Calculate the amount of HCN that gives the lethal dose in a small laboratory room measuring 12.0 ft×15.0 ft×9.20ft.

Express your answer to three significant figures and include the appropriate units.

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Part B

2NaCN(s)+H2SO4(aq)Na2SO4(aq)+2HCN(g)

What mass of NaCN gives the lethal dose in the room?

Express your answer to three significant figures and include the appropriate units.

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Part C

HCN forms when synthetic fibers containing Orlon® or Acrilan® burn. Acrilan® has an empirical formula of CH2CHCN, so HCN is 50.9% of the formula by mass. A rug in the laboratory measures 12.0× 15.0 ft and contains 30.0 oz of Acrilan® fibers per square yard of carpet. If the rug burns, what mass of HCN will be generated in the room? Assume that the yield of HCN from the fibers is 20.0% and that the carpet is 41.0 %consumed.

Express your answer to three significant figures and include the appropriate units.

± Hydrogen Cyanide Poisoning

Hydrogen cyanide, HCN, is a poisonous gas. The lethal dose is approximately 300. mg HCN per kilogram of air when inhaled. The density of air at 26 C is 0.00118 g/cm3.

Part A

Calculate the amount of HCN that gives the lethal dose in a small laboratory room measuring 12.0 ft×15.0 ft×9.20ft.

Express your answer to three significant figures and include the appropriate units.

16.6 g

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Correct

Part B

Consider the formation of HCN by the reaction of NaCN (sodium cyanide) with an acid such as H2SO4 (sulfuric acid):

2NaCN(s)+H2SO4(aq)Na2SO4(aq)+2HCN(g)

What mass of NaCN gives the lethal dose in the room?

Express your answer to three significant figures and include the appropriate units.

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Incorrect; Try Again; 2 attempts remaining

Part C

HCN forms when synthetic fibers containing Orlon® or Acrilan® burn. Acrilan® has an empirical formula of CH2CHCN, so HCN is 50.9% of the formula by mass. A rug in the laboratory measures 12.0× 15.0 ft and contains 30.0 oz of Acrilan® fibers per square yard of carpet. If the rug burns, what mass of HCN will be generated in the room? Assume that the yield of HCN from the fibers is 20.0% and that the carpet is 41.0 %consumed.

Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

Consider the formation of HCN by the reaction of NaCN (sodium cyanide) with an acid such as H2SO4 (sulfuric acid):

2NaCN(s)+H2SO4(aq)Na2SO4(aq)+2HCN(g)

What mass of NaCN gives the lethal dose in the room?

2 NaCN(s) + H2SO4(aq) Na2SO4(aq) + 2 HCN(g)

1 mole NaCN ( @ 49.01 g/mol) --> 1 mole HCN ( @ 27.03 g/mol)

16.6 g g HCn @ 49.01 g NaCN / 27.03 g HCN = 30.09 grams of NaCN

HCN forms when synthetic fibers containing Orlon® or Acrilan® burn. Acrilan® has an empirical formula of CH2CHCN, so HCN is 50.9% of the formula by mass. A rug in the laboratory measures 12.0× 15.0 ft and contains 30.0 oz of Acrilan® fibers per square yard of carpet. If the rug burns, what mass of HCN will be generated in the room?

0.50 * 12 * 15 = 90 square-feets = 9.2 square-meters

This area has a weight corresponding to

30 * 9.2 / (0.914)^2 = 330 oz = 9340 grams of rug

This mass leaven off a corresponding amount of HCN by 20% of theoretical yield expressed in 50.9%

20% * 50.9% * 9340 = 950 grams of HCN

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