Răspuns:
C. 0.2
Explicație:
Reactia este:
[tex]5HOOC-CH=CH-COOH + 8KMnO_4 + 12H_2SO_4 ---> 10 HOOC-COOH + 12H_2O + 4K2SO_4 + 8MnSO_4[/tex]
Mai intai aflam cat acid maleic a intrat in reactie.
[tex]C_M = \frac{n}{V} => n = C_M * V[/tex]
[tex]n = 0.2 * 0.4 = 0.08 moli[/tex]
Calculand pe reactie:
5 moli acid maleic ...... 8 moli KMnO4
0.08 moli acid maleic .... x moli KMnO4
x = 0.128 moli KMnO4
[tex]C_M = \frac{n}{V} => V = \frac{n}{C_M}[/tex][tex]V = \frac{0.128}{0.64} = 0.2 L[/tex] solutie KMnO4