Hydrogen reacts with oxygen to form water. Which of these best describes
how the mass of the products compared to the reactants?
The mass of the water is greater because water is a liquid while hydrogen and oxygen
are gases.
The mass of the water is less because the hydrogen and oxygen have combined into
one substance.
The mass of the water is less than the mass of the hydrogen and oxygen because the
atoms were rearranged.
The mass of the products is equal to the mass of reactants