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Mathematics 7 Online
OpenStudy (anonymous):

A water molecule is made of 1 oxygen atom and 2 hydrogen atoms. The mass of an oxygen atom is O, and the mass of a hydrogen atom is H. Match the expressions to their meanings. Each meaning may match more than one expression. mass of 1 h2O molecule, mass of 4 h2O molecule, or neither of these. Classify the following in one of the three categories above: O+H 2H+O H+2O 8H+4O O+2H 4(2H+O)

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