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Mwęgla=12u
Mtlenu=16u
Mwodoru=1u
Mcząsteczki=12u*3 + 1u*7 + 16u*1 + 1u*1= 60u
%węgla= *100% = 60%
Stosunek masowy - H:O:C - 8:16:36 = 2:4:9