Nitrogen occupies a volume of 14 liters. Calculate the number of nitrogen molecules in a given volume of gas.

Given:

V (N2) = 14 l

To find:

N (N2) =?

Decision.

N = ν * Na;

Na = 6.02 * 10 ^ 23 – Avogadro’s number, 1 / mol;

ν (N2) = V / Vm = 14 / 22.4 = 0.625 mol;

Vm = 22.4 l / mol – molar volume of any gas under normal conditions (n.v.);

N (N2) = 0.625 * 6.02 * 10 ^ 23 = 3.76 * 10 ^ 23.



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