I think you are looking for the chemical equations...here's the equation
H_{2 }+ O_{2} ----> H_{2}O (g)
H_{2 }for Hydrogen (we add subscript of 2 because this is diatomic element)
O_{2 }for Oxygen ( this is also diatomic element so, we add subscript 2)
then the product is H_{2}0 (g) for water in the form of gas or steam