Ответ:
C3H7OH
M(C3H7OH) = 12*3+1*7+16+1 = 60 g/mol
W(C) = 12*3 / 60 * 100% = 60%
C6H6
M(C6H6) = 12*6+1*6 = 78 g/mol
W(C) = 12*6 / 78 * 100% = 92.3%
HCOONa
M(HCOONa) = 1+12+16+16+23 = 68 g/mol
W(C) = 12/68*100% = 17.65%
CH3NH2
M(CH3NH2) = 12+1*3+14+1*2 = 31g/mol
W(C) = 12/31*100% = 38.71%
Объяснение: