1.двухэлементное вещество-это.....
А)HCOOH;
B)C2H2
C)CH3COONa;
D)CH3CHO;
2.Сумма коэффициентов в молекулярном уравнении реакции C5H12+O2=CO2+H2O
A)13;
B)15;
C)16;
D)19;
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