Something around 100,000,000.
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Two of every three atoms that make up water is a hydrogen atom.
They could make Cyclobutadiene, cyclobutyne, methelynecyclopropene, tetrahedrane, vinylacetylene or butatriene. Or they could just be together as a bunch of carbon atoms and some hydrogen atoms. There is no reason to assume that they interact.
12 inches make an inch
It takes 2.5cm to make 1 inch.
Obviously 4.