Ответы на вопрос:
Mr ( ca ) = 40 w ( ca ) = 100 * 0,4 = 40 % mr ( c ) = 12 w ( c ) = 100 * 0,12 = 12 % mr ( o ) = 16 * 3 ( 3 атома ) w ( o ) = 100 * 0,48 = 48 % mr ( h2co3 ) = 100
2ch4+cl2=ch3cl +hcl 2ch3cl + 2 na = 2nacl + c2h6 c2h6+hno3=c2h5no2+h2o 3 1. hcoh +ag2o=hcooh+2ag 2.c2h5oh +ch3cooh=ch3cooc2h5 +h2o 3. c2h5br+naoh=c2h4+nabr + h2o
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