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m C₂H₅NO₂ = 2×12u + 5×1u + 14u + 2×16u= 24u + 5u + 14u+ 32u = 75u
24/75= 0,32= 32%
Odp. Procent masowy węgla w glicynie wynosi 32%.
75g glicyny----100%
24g węgla-----x%
x=24*100/75
x=32% węgla