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timurjin [86]
3 years ago
13

Which is a factor in determining the average atomic mass of an element

Chemistry
1 answer:
shtirl [24]3 years ago
4 0

The mass numbers of the different isotopes of that element are averaged according to their respective abundances in nature.

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Two containers, one with a volume of 3.0 L and the other with a volume of 2.0 L contain, respectively, argon gas at 1.1 atm and
aalyn [17]

Answer:

a. p_T=0.93atm.

b.

p_{Ar}=0.66atm\\\\p_{He}=0.3atm

c.

x_{Ar}=0.6875\\\\x_{He}=0.3125

Explanation:

Hello,

In this case, considering that the valve is opened, we can use the Boyle's law in order to compute the final pressure of argon by considering its initial pressure and volume and a final volume of 5.0 L:

p_{Ar}=\frac{1.1atm*3.0L}{5.0L}=0.66atm

And the final pressure of helium:

p_{He}=\frac{0.75atm*2.0L}{5.0L}=0.3atm

Which actually are the partial pressure of both of them, it means that the total pressure is:

Finally, the mole fraction of each gas is computed by considering the Dalton's law:

x_i=\frac{p_i}{p_T}

x_{Ar}=\frac{0.66atm}{0.93atm} =0.6875\\\\x_{He}=\frac{0.3atm}{0.93atm} =0.3125

Best regards.

6 0
3 years ago
What event marks the beginning of Earth's current era?
uysha [10]
B. We are in the cenzoic era so what previously had happen to cause the life we live today was a huge mass extinction.... hope this helps!!
3 0
3 years ago
Read 2 more answers
Aqueous concentrated nitric acid is 69% hno3 by weight and has a density of 1.42 g/ml.
OleMash [197]

Answer: -

15.55 M

35.325 molal

Explanation: -

Let the volume of the solution be 1000 mL.

Density of nitric acid = 1.42 g/ mL

Total Mass of nitric acid Solution = Volume of nitric acid x Density of nitric acid

= 1000 mL x 1.42 g/ mL

= 1420 g.

Percentage of HNO₃ = 69%

Amount of HNO₃ = \frac{69} {100} x 1420 g

= 979.8 g

Molar mass of HNO₃ = 1 x 1 + 14 x 1 + 16 x 3 = 63 g /mol

Number of moles of HNO₃ = \frac{979.8 g}{63 g/ mol}

= 15.55 mol

Molarity is defined as number of moles per 1000 mL

We had taken 1000 mL as volume and found it to contain 15.55 moles.

Molarity of HNO₃ = 15.55 M

Mass of water = Total mass of nitric acid solution - mass of nitric acid

= 1420 - 979.8

= 440.2 g

So we see that 440.2 g of water contains 15.55 moles of HNO₃

Molality is defined as number of moles of HNO₃ present per 1000 g of water.

Molality of HNO₃ = \frac{15.55 x 1000}{440.2}

= 35.325 molal

3 0
3 years ago
Eyeglasses provide as much protection as safety goggles. * true or false
Artyom0805 [142]
False. Eyeglasses do not cover all around the eye however safety goggles do
7 0
3 years ago
Read 2 more answers
Abuse of time and temperature can occur in each of the following ways except: The items are not cooked to the proper internal te
exis [7]

Holding items in the freezer for too long is not an example of abuse of time and temperature.

<h3>What is abuse of time and temperature?</h3>

Abuse of time and temperature has to do with a situation in which time is used in an improper way or food is not held at the correct temperature ultimately leading to food poisoning.

Holding items in the freezer for too long is not an example of abuse of time and temperature.

Learn more about temperature: brainly.com/question/7510619

5 0
2 years ago
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