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SIZIF [17.4K]
2 years ago
8

A sample of an unknown gas effuses in 11.1 min. An equal volume of H2 in the same apparatus at the same temperature and pressure

effuses in 2.42 min. What is the molar mass of the unknown gas
Chemistry
1 answer:
Anit [1.1K]2 years ago
7 0

Answer:

<em>Molar mass of the gas is 0.0961 g/mol</em>

<em></em>

Explanation:

The effusion rate of an unknown gas = 11.1 min

rate of H_{2} effusion = 2.42 min

molar mass of hydrogen = 1 x 2 = 2 g/m

molar mas of unknown gas = ?

From Graham's law of diffusion and effusion, the rate of effusion and diffusion is inversely proportional to the square root of its molar mass.

from

\frac{R_{g} }{R_{h} } = \sqrt{\frac{M_{h} }{M_{g} } }

where

R_{h} = rate of effusion of hydrogen gas

R_{g} = rate of effusion of unknown gas

M_{h} = molar mass of H2 gas

M_{g} = molar mass of unknown gas

substituting values, we have

\frac{11.1 }{2.42 } = \sqrt{\frac{2 }{M_{g} } }

4.587 = \sqrt{\frac{2 }{M_{g} } }

\sqrt{M_{g} } = \sqrt{2}/4.587

\sqrt{M_{g} } = 0.31

M_{g} = 0.31^{2} = <em>0.0961 g/mol</em>

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Answer: 12


Explanation.


This problem was recently posted and deals with the conversion of units,so I give the same answer.


You need to convert the 9 quibs of skvarnick to sleps, to determine how many sleps you have.


The conversion of units is easily undertaken once you build your conversion factors.


Conversion factors are ratios (fractions) equivalent to one, which permits use the identity property of the multiplication to change one unit to a different equivalent one.


Remember that the identity property of multiplication states that any amount multiplied by 1 remains unchanged, i.e.

               a.1=a

Then, build your conversion factor from the definitions given:

  •    12 sleps is equal to 9 quibs.
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  •    in virtue of the division property of equality, you can divide both sides by 12 sleps and get:

                                       1 = 12 sleps /  9 quibs ← conversion factor

Now you can multiply the amount 9 quibs by the conversion factor, which is equal to 1, to find the equivalent amount of sleps:


  •    identity property: 9 quibs = 9 quibs × 1
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You can see that the unit quibs appear in the numerator and the denominator so it cancels out, and the result will be in sleps.


So, all you have to do now is the operations with the numbers:

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3 0
3 years ago
Which statement describes a physical change? *
xxMikexx [17]
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4 0
2 years ago
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olasank [31]

Answer:

<h2>10 m/s²</h2>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

a =  \frac{f}{m} \\

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From the question we have

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We have the final answer as

<h3>10 m/s²</h3>

Hope this helps you

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For example, NH_{3}, CH_{3}OH etc are the molecules which show dipole-dipole interactions.

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