Express the chemical reaction between hydrogen and oxygen elements for the formation of water in word equation and chemical equation(in short)

Two moles of hydrogen gas combine with one mole of oxygen gas to produce two moles of water.

Explanation:

This is the required amount of each element to synthesize water. The equation has been balanced using coefficients.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.