Calculate the mass in grams: 1) one nitrogen molecule N2; 2) two xenon atoms.

univerkov | February 4, 2021 | education

Avogadro’s number: NA = 6.02 * 10^23 mol − 1;

m molecule = m 1 mol / 6.02 * 10^23.

Mr (N2) = 14 * 2 = 28;

M (N2) = 28 g / mol.

m molecule (N2) = 28 / 6.02 * 10^23 = 4.65 * 10^-23 g.

Ar (2Xe) = 131 * 2 = 262;

M = Ar.

m 2 atoms Xe = 262 / 6.02 * 10^23 = 43.52 * 10^-23 g.

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