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zmey [24]
3 years ago
7

How many atoms are in a mol of Oxygen (O) atoms?

Chemistry
1 answer:
SVEN [57.7K]3 years ago
3 0

Answer:

One mole of oxygen atoms has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 10^23 atoms of oxygen.

Explanation:

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what is the difference between the number of electrons in an atom of selenium and the number of electrons in an atom of aluminum
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Answer:

The atomic number of Selenium is 34. This means that Selenium possesses 34 electrons.

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Hence, there is a difference of 21 between the number of electrons in an atom of selenium and the number of electrons in an atom of aluminium.

Selenium has 6 electrons in it's outer most shell whereas aluminium has 3 electrons in its outer most shell. As a result, aluminium will have a greater tendency to lose one of its outer most electrons to become stable.

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3 years ago
A gas sample occupies 3.25 liters at 297.5K and 2.4 atm. Determine the temperature at which the gas will occupy 4.25 L at 1.50 a
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For equal moles of  gas, temperature can be calculated from ideal gas equation as follows:

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2.4 atm ×3.25 L=n×R×297.5 K

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Putting the value of n×R in above equation,

1.5 atm ×4.25 L=0.0262 (atm L/K)×T

Thus, T=243.32 K


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