How do you use a periodic table to determine the mass of 1 mol of nitrogen gas molecules?

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How do you use a periodic table to determine the mass of 1 mol of nitrogen gas molecules?

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Answer 1 · 2016-12-22T16:11:35

Find yourself a Periodic Table.......and there should be one beside you now if you are doing your chemistry homework........

Explanation:

The Periodic Table lists (i) the atomic symbol, (ii) the atomic number, $Z$ $Z$ , and (iii) the atomic mass with units of $g \cdot m o l^{- 1}$ $g*mol^-1$ . You will always be issued a copy of the Periodic Table in a chemistry or physics exam.

For nitrogen, $Z = 7$ $Z=7$ , and the atomic mass is listed as $14.01 \cdot g \cdot m o l^{- 1}$ $14.01*g*mol^-1$ . Since elemental nitrogen is a diatomic element, (in fact ALL the elemental gases SAVE the inert gases are diatomic, i.e. $X_{2}$ $X_2$ ), the mass of gaseous nitrogen is $28.02 \cdot g \cdot m o l^{- 1}$ $28.02*g*mol^-1$ .

Note that you simply have to KNOW that it is $dihydrogen, dioxygen, dinitrogen, difluorine, dichlorine etc$ $"dihydrogen, dioxygen, dinitrogen, difluorine, dichlorine etc"$ . $H_{2}$ $H_2$ , $N_{2}$ $N_2$ etc. are the standard states of these elements under standard conditions. You would not be told this normally (certainly not if you are an undergrad!).

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How do you use a periodic table to determine the mass of 1 mol of nitrogen gas molecules?

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