Calculate the total number of electrons present in 1.4 g of dinitrogen gas.


Given:

Mass of dinitrogen = 1.4 g


We know that molar mass of dinitrogen = 28 g mol-1


The number of moles of dinitrogen in 1.4g = 1.4/28 = 0.05mol


Now, the number of molecules in 1.4g of dinitrogen: -


= 0.05 x 6.022 × 1023


= 3.01 x 1023


We know that 1 molecule of dinitrogen contains 14 electrons.


3.01 × 1023 molecules of dinitrogen contain:


= 14 × 3.01 × 1023


= 4.214 × 1023 electrons.


Hence, the total number of electrons present in 1.4 g of dinitrogen gas is 4.214 × 1023.


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