formula azota N2,togda moliarnaia massa azota 2*14=28 g/mol'.
Kolichestvo veshestva azota 48*10^23/6*10^23=8 mol'(gde 6*10^23 - chislo Avogadro).
Togda iskomaia massa ravna 28 g/mol' * 8 mol'=224 gramma.
Otvet:224 gramma.
