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mC3H5(OH)3=3*12u+8*1u+3*16u=92u
Stosunek masowy:
mC:mH=36:8=9:2
36u-x%
92u-100%
x=36u*100%/92u
x=39,13%C
stosunek
zawartość węgla
36u - x [%]
92u - 100%
x = (36u *100%) : 92u = 39%