Question

As2S3+KMnO4+H2SO4=K2SO4+SO2+MnO+As2O5 balance the equation​

Answer 1

it can be solved easily with help of half reaction method :

step 1 : first balance As2S3, SO2 and As2O5 . see the below reaction...

$As_2S_3+11H_2O\rightarrow 3SO_2+As_2O_5+22H^++22e^-$.....(1)

step 2 : Now balance KMnO4, H2SO4, K2SO4 and MnO.

$2KMnO_4+H_2SO_4+10H^++10e^-\rightarrow K_2SO_4+2MnO+6H_2O$.......(2)

step 3 : multiplying 11 with equation (2) and 5 with equation (1)

$22KMnO_4+11H_2SO_4+110H^++110e^-\rightarrow11K_2SO_4+22MnO+66H_2O$.....(2)

$5As_2S_3+55H_2O\rightarrow15SO_2+5As_2O_5+110H^++110e^-$.....(1)

step 4: adding equations (1) and (2) to get balanced chemical reaction.

$22KMnO_4+11H_2SO_4+5As_2S_3\rightarrow11K_2SO_4+22MnO+11H_2O+15SO_2+5As_2O_5$ This is required balanced chemical equation.