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12gC -- 15gCH3
xgC -- 32gCH3
x=26,5gC
2) CaO= 56g
CaCO3= 100g
CaO + CO2 ---> CaCO3
50gCaO -------------- xgCaCo3
56gCaO -------------- 100gCaCo3
x=89,3 (w zaokrągleniu)