CHEMISTRY
posted by kevin on .
Write a balanced equation for the following reductionoxidation reaction.
SO3(2) + MnO4()  SO4(2–) + Mn(2+)
can someone help me step by step??

Answered above.

SO3(2) + MnO4()  SO4(2–) + Mn(2+)
first deal with S, Mn atoms
there must be the same number on each side
nSO3(2) + mMnO4()  nSO4(2–) + mMn(2+)
now try 2jH(+) on the left and jH2O on the right
nSO3(2) + mMnO4() +2jH(+)  nSO4(2–) + mMn(2+) + jH2O
O atoms
3 n + 4 m = 4 n + j
or
n+j = 4 m
+ charges
2 n  1 m + 2 j = 2 n + 2 m
so from the second one
3 m = 2 j
j = (3/2) m
from the first one
n + (3/2) m = 4 m
or
n = (5/2) m
Now go back using m = 2 to make the fraction go away
then j = 3
and n = 5
5 SO3(2) + 2 MnO4(1) + 6 H(+1) > 3 H2O + 5 SO4(2) + 2 Mn(+2)