kak bantuin dong gimana caranya?....

orde S2- = y
v1/v2 = ( Ma1 x Mb1 / Ma2 x Mb2 )^y
2/8 = ( 0.1 x 0.1 / 0.2 x 0.1 )^y
1/4 = (1/2)^y
y = 2

orde Fe 3+ = x
v1/v2 = ( Ma1 x Mb1 / Ma2 x Mb2 )^x
8/16 = ( 0.2 x 0.1 / 0.2 x 0.2 )^x
1/2 = (1/2)^x
x = 1

r = k [Fe3+]^x [S2-]^y
r = k [Fe3+]^1 [S2-]^2. (b)