color(white)(l)"kg"#. Here's how to calculate it.
1. Look up the atomic mass of #"N"#
#"[Atomic mass](https://socratic.org/chemistry/a-first-introduction-to-matter/atomic-mass-and-isotope-abundance) = 14.007 u"#
2. Calculate the molecular mass of #"N"_2#
#"Molecular mass" = 2 color(red)(cancel(color(black)("atoms N"))) × "14.007 u"/(1 color(red)(cancel(color(black)("atom N")))) = "28.014 u"#
3. Convert unified atomic mass units to grams
#"Molecular mass" = 28.014 color(red)(cancel(color(black)("u"))) × (1.660× 10^"-24" color(white)(l)"g")/(1 color(red)(cancel(color(black)("u")))) = 4.650 × 10^"-23"color(white)(l) "g"#
4. Convert grams to kilograms.
#4.650 × 10^"-23" color(red)(cancel(color(black)("g"))) × "1 kg"/(1000 color(red)(cancel(color(black)("g")))) = 4.650 × 10^"-26" color(white)(l)"kg"#
The molecular mass of nitrogen is #4.650 × 10^"-26" color(white)(l)"kg"#
