Question

Hydrogen sulfide gas burns in the presence of oxygen to produce sulfur dioxide gas and water vapor. Write a balanced chemical equation, including the physical state

Answer 1

2H2S + 3O2 --> 2SO2 + 2H2O If this doesn't help, then I have no idea

Answer 2

The problem asks to show the states, also. The equation is correct.
2H2S(g) + 3O2(g) --> 2SO2(g) + 2H2O(g)
Note the problem TELLS you the water is vapor so you know to write it as a gas and not a liquid.