1. A sample of neon gas collected at a pressure of 0.627 atm and a temperature o

Question

1. A sample of neon gas collected at a pressure of 0.627 atm and a temperature of 16.0 °C is found to occupy a volume of 24.5 liters. How many moles of Ne gas are in the sample? ______mol

2. A sample of xenon gas collected at a pressure of 1.35 atm and a temperature of 282 K is found to occupy a volume of 789 milliliters. How many moles of Xe gas are in the sample? _____________ mol

3. 0.627 mol sample of neon gas at a temperature of 16.0 °C is found to occupy a volume of 24.5 liters. The pressure of this gas sample is ________ mm Hg.

4. A sample of xenon gas collected at a pressure of 372 mm Hg and a temperature of 297 K has a mass of 177 grams. The volume of the sample is __________ L.

Explanation / Answer

1)

pressure = 0.627 atm

volume = 24.5 liters

temperature = 16 C + 273 = 289 K

R = 0.0821 l-atm/mol -K

according to ideal gas equation:

PV = nRT

0.627 x 24.5 = n x 0.0821 x 289

n = 0.647

moles of Ne gas = 0.647

2)

pressure = 1.35 atm

temperature = 282 K

volume = 789 milliliters = 0.789 L

PV = nRT

1.35 x 0.789 = n x 0.0821 x 282

n = 0.046

moles of Xe gas = 0.046

3) moles n = 0.627 mol

temperature = 16.0 °C = 289 K

volume = 24.5 liters.

PV = nRT

P x 24.5 = 0.627 x 0.0821 x 289

P = 0.607 atm

pressure = 461.5 mm Hg

4) pressure = 372 mm Hg = 0.489 atm

temperature = 297 K

mass = 177 grams.

moles of Xe = 177 / 131.3

                    = 1.35

PV = nRT

0.489 x V = 1.35 x 0.0821 x 297

V = 67.32 L

volume = 67.32 L

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