a = CH3-CH2-OH
b = CH3-COOH
c = CH3-COO-CH2-CH3
ecuatiile le scri tu...
C4H8O2 , M = 4x12+8×1+2×16 = 105 g/mol
105g compus ............... 48g C ........ 8g H .......... 32g O
100% compus ............... a% ................. b% ............. c%
le calculezi
