: Since this is a 2003 edition, regional libraries in Belarus or university archives often carry the physical "Methodological Recommendations" which act as the teacher's key. Typical Problem Types in the 10th Grade Manual
: Finding formulas based on mass fractions of elements (C, H, O) or combustion products ( CO2cap C cap O sub 2 H2Ocap H sub 2 cap O : Since this is a 2003 edition, regional
CH4→CH3Cl→C2H6→C2H4→C2H5OHcap C cap H sub 4 right arrow cap C cap H sub 3 cap C l right arrow cap C sub 2 cap H sub 6 right arrow cap C sub 2 cap H sub 4 right arrow cap C sub 2 cap H sub 5 cap O cap H : Since this is a 2003 edition, regional
💡 : If you have a specific problem number (e.g., Problem 5.12) or the text of a task, I can solve it for you step-by-step using current chemical standards. : Since this is a 2003 edition, regional