Question

types of reactions quick check
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
there are two atoms of hydrogen and one atom of oxygen in a water molecule
hydrogen gas has two atoms, and oxygen gas has one atom
some oxygen gas escapes the reaction, and hydrogen gas is conserved

Explanation:

The chemical formula of water is H₂O, meaning each water molecule contains two hydrogen atoms and one oxygen atom. During decomposition, the atoms in water molecules are rearranged into hydrogen and oxygen gases. So, based on the composition of water molecules, twice as much hydrogen as oxygen is formed.

Answer:

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