How many moles is equivalent to 8.23 x 1022 molecules of nitrogen dioxide: no2 (mw. 46.01 g/mol)?

0.1367 moles of NO₂

Explanation:

The relation between moles and molecules, ions, or atoms is given by Avogadro Number (NA). Avogadro determined that 1 mol has 6.02x10²³ molecules, ions, or atoms. So:

1 mol of NO₂ 6.02x10²³ molecules of NO₂

x 8.23x10²² molecules of NO₂

By a direct simple three rule:

6.02x10²³x = 8.23x10²²

x = (8.23x10²²)/(6.02x10²³)

x = 0.1367 moles of NO₂

a. they are both space stations

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explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.