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# A 118-mL flask is evacuated, and its mass is measured as ## Problem 102P Chapter 11

Introductory Chemistry | 5th Edition

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Problem 102P

PROBLEM 102P

A 118-mL flask is evacuated, and its mass is measured as 97.129 g. When the flask is filled with 768 torr of helium gas at 35 °C, it is found to have a mass of 97.171 g. Is the gas pure helium?

Step-by-Step Solution:

Solution 102P

Here, we are going to identify if the gas used in the above problem is pure helium.

Step 1:

From ideal gas equation, we have,

pV = nRT        ----(1)

Where, p = pressure

V = volume of the gas

n =  number of moles of the gas

R =  universal gas constant and its value is 0.0821 L atm K-1 mol-1

T =  temperature

Step 2:

Given, volume of the flask(V) = 118 mL = 118/1000 L = 0.118 L

Pressure(p) = 768 torr = 768 x 0.00131579 atm = 1.01 atm

Temperature(T) = 35 oC = 35 + 273 K = 308 K

Substituting the values in equation (1), we get,

n = pV / RT

n = (1.01 atm x 0.118 L) / (308 K x 0.0821 L atm K-1 mol-1)

= (0.11918 L atm) / (25.2868 L atm mol-1)

n = 0.0047 mol.

Step 3:

Now, 1 mol of He gas = molar mass of helium gas

0.0047 mol of He gas = 0.0047 x molar mass of He gas

= 0.0047 mol  x 4.003 g/mol

= 0.019 g

Step 4 of 5

Step 5 of 5

##### ISBN: 9780321910295

This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. Since the solution to 102P from 11 chapter was answered, more than 760 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 102P from chapter: 11 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. This full solution covers the following key subjects: helium, mass, flask, gas, evacuated. This expansive textbook survival guide covers 19 chapters, and 2045 solutions. The answer to “A 118-mL flask is evacuated, and its mass is measured as 97.129 g. When the flask is filled with 768 torr of helium gas at 35 °C, it is found to have a mass of 97.171 g. Is the gas pure helium?” is broken down into a number of easy to follow steps, and 42 words.

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