If the equation is balanced: The coefficient numbers in the equation show the number of molecules, formula units, or atoms of the species involved in.
A cloud is made up of liquid water droplets. A cloud forms when air is heated by the sun. As it rises, it slowly cools it reaches the saturation point and water condenses, forming a cloud. As long as the cloud and the air that its made of is warmer than the outside air around it, it floats!
You forgot solid... Clouds consist of water which has condensed from a gas to a liquid around a solid particle (dust, smoke, etc.) in the atmosphere. Clouds can also be composed of ice crystals at higher altitudes. So, the individual cloud particles, excluding the tiny solid core, can either be liquid or solid water.