82. HOOC-COOH + [O] = 2CO2 + H2O
2KMnO4 + 3H2SO4 = K2SO4 + 2MnSO4 + 3H2O + 5[O]
n acid/nKMnO4 = 5/2 n acid = 2,5nKMnO4 = 2,5·0,01·0,1 = 0,0025 moli
m = 0,0025·90 = 0,225g
83. nCH3COOH = 120/60 = 2moli
n ester = nH2O = 0,85·2 = 1,7 moli
ester : CH3-COOC2H5 M = 88g/mol m ester = 149,6g mH2O = 30,6g
84. trioleina + 3H2 ⇒ tristearina
acid oleic : C18H34O2 trioleina : C57H104O6 M = 884 g/mol
n trioleina = 1000/884 = 1,131kmoli nH2 = 3,393 kmoli V = 76,018m³
85. CxH2xO2 2·16·100/M = 53,33 M = 60g/mol
acid = CH3-COOH
nNaOH = n acid = 50·0,06 = 3moli