MnO - 4 MnO 2-2+ MnO Mn - MnO MnO 4 4 2 CH2 = CH2 + Br2 BrH2C CH2Br CaS + 2H O = Ca( OH) + H S 2 2 2 Ca P + 6H O = 3Ca( OH) + 2PH 3 2 2 2 3 Ca As + 6H O = 3Ca( OH) + 2AsH 3 2 2 2 3
k Cr O + 4H SO + 3H S = Cr ( SO ) + 3S + K SO + 7H O 2 2 7 2 4 2 2 4 3 2 4 2 k Cr O + 4H SO + PH = Cr ( SO ) + H PO 2 2 7 2 4 3 2 4 3 3 3 + K SO + 4H O 2 4 2 k Cr O + 4H SO + AsH = Cr ( SO ) + H AsO 2 2 7 2 4 3 2 4 3 3 3 + K SO + 4H O 2 4 2 3
Q Q [( m1 + m2 ) + W] C t = = Λ Λ n MV 1000 MV 1000 mol ( m1 + m 2 ) C t Q MV 1000 g 1 W
Q ( 50 + 50) 4. 184 ( t 2 t 1) 1 50 1000 100 4. 184 ( t 2 t 1) = ( J)( t 2 t1) Λ Λ Λ Λ Λ Λ Λ Λ Λ 0. 05
1 2 3 1 3 1 2 2 3 W Q Q 2 1 = + C t t ( g) 2 1 W
2 2 1 2 1
D 2 284. 47 V π ( ) NA = 2 1 16 mol 22 10 m V ( d 1) d n = 2 D 2 S cm D S = π ( ) 2
S n = = A D π ( ) 2 22 10 2 16 W m m Vd ( d 1) = ( d 1) = V V V d D W W 2 m Vd ( d 1) π ( ) 2 ' = = 16 n V 22 10 16 22 10 m Vd ( d 1) W ' = D 2 V π ( ) 2 16 M 22 10 m Vd ( d 1) NA = = 284. 47 W' D 2 V π ( ) 2 D 2 284. 47 V π ( ) NA = 2 mol 22 10 m V ( d 1) ( 1 ) 16 d
3. 1 1 2 3 D S = π ( ) 2 ( cm 2 ) S
D 2 284.47 Vπ( ) 2 N A = 22 10 16 m V d ( d 1) 1 ( mol )
3 2 3 2
3 2 4
t = g g 100 g
3 2 3 3 1 1 2 3 = m - m g = m - m g 2 3 S = 100 m - m 3 1 m - m g 2 3 3 1
3
f
1 2 2 4 1
2 3 6 12V
2 2 2 5 2 2 3 3 2 3 2 3 2 3
12-3
Fe2O3 MnO2 Fe2O3 2g MnO20.5 3g
2 2
2 4 3 2 3