Quick questions on Chemical formulas and percent composition - Regents Chemistry

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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Write the formula of the compound formed between

\text{Al}^{3+}

and

\text{SO}_4^{2-}

(sulfate, from Table E). [1 point]

What is q2?

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Calculate the percent by mass of hydrogen in water,

\text{H}_2\text{O}

(gram-formula mass

18.0

). [2 points]

What are not reducing the subscripts?

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After the crossover method, reduce to the smallest whole-number ratio;

\text{Ca}_2\text{O}_2

should be written

\text{CaO}

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