Dry ice is sometimes used for special effects to form a \"fog\" as it sublimes f

Question

Dry ice is sometimes used for special effects to form a "fog" as it sublimes from the solid to the gaseous state. If 99.0 grams of dry ice is used to generate this "fog", how many torr of pressure will be exerted by the gaseous carbon dioxide once all of the dry ice sublimes? Assume the volume of the auditorium where the fog is generated is 1.24 x 105 m3and the temperature is 22°C. (Enter your answer using either standard or scientific notation. For scientific notation, 6.02 x 1023 is written as 6.02E23.) Numeric Answer:

Explanation / Answer

mass of dry ice = 99.0 g

moles of dry ice = 99.0 / 44.01 = 2.25 mol

volume = 1.24 x 10^5 m3 = 1.24 x 10^8 L

temperature = 22 oC = 295 K

P V = n R T

P x 1.24 x 10^8 = 2.25 x 0.0821 x 295

P = 4.40 x 10^-7 atm

pressure = 3.34 x 10^-4 torr

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