A student has a beaker full of water. He finds that he has 4.0 x 10 molecules of H₂O in his beaker, how many grams is this?

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".