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A formula records types and numbers - Online practice 1

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Count atoms in 2 molecules of H2O. Plain digits in a formula represent subscripts: each molecule contains 2 H atom(s) and 1 O atom(s). A coefficient counts whole molecules; a subscript describes one molecule. This is a paper model, not a chemical procedure.

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