Question

Cr2O72- + aH+ + bNO2 → cCr3+ + dNO3 - + eH2O
Harga koefisien reaksi di atas : a, b, c, d, e, berturut-turut adalah........
a. 3, 6, 2, 6, 3
b. 1, 5, 2, 5, 1
c. 8, 3, 2, 3, 4
d. 3, 4, 2, 4, 3
e. 8, 3, 2, 3, 5
Tolong dengan caranya

Answer 1

Cr2O7{2-} + 2 H{+} + 6 NO2 => 2 Cr{3+} + 6 NO3{-} + H2O
H : a = 2e
N : b = d
O : 2b + 7 = 3d + e
jika e = 1, a = 2
2b + 7 = 3d + e
2b + 7 = 3b + 1
7-1 = 3b - 2b
b = 6
d = b = 6