Question

in the decomposition of water, why is twice as much hydrogen as oxygen formed? (1 point)
hydrogen atoms are twice the size of oxygen atoms.
hydrogen gas has two atoms, and oxygen gas has one atom.
some oxygen gas escapes the reaction, and hydrogen gas is conserved.
there are two atoms of hydrogen and one atom of oxygen in a water molecule.

Explanation:

The chemical formula of water is H₂O, meaning each water molecule has two hydrogen atoms and one oxygen atom. During water - decomposition, the atoms in water molecules are rearranged to form hydrogen and oxygen gases. The ratio of hydrogen to oxygen formed is based on the ratio of hydrogen and oxygen atoms in the water molecule.

Answer:

There are two atoms of hydrogen and one atom of oxygen in a water molecule.