Use the equation to answer the question.
H2SO4 + HI → H2S + I2 + H2O
Which option shows a correctly balanced chemical equation?
1. 2H2SO4 + 2HI → 2H2S + I2 + 4H2O
2. H2SO4 + HI → H2S + I2 + H2O
3. H2SO4 + 8HI → H2S + 8I2 + 4H2O
4. H2SO4 + 8HI → H2S + 4I2 + 4H2O
The correctly balanced chemical equation is:
4. H2SO4 + 8HI → H2S + 4I2 + 4H2O