4.3210 x 1033 chromate ions in formula units of strontium chromate?

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gsenviro | College Teacher | (Level 1) Educator Emeritus

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Strontium Chromate has the chemical formula:

`SrCrO_4`

that is, each mole of strontium chromate has 1 mole of strontium ion and 1 mole of chromate ions. Here, we are given with 4.3210 x 10^33 chromate ions. This means that we have an equal number of strontium ions, or 4.3210 x 10^33 strontium ions. Each mole of a substance contains an Avogadro's number of atoms or 6.023 x 10^23 atoms. Using the same knowledge, here we have 7.174 x 10^9 moles (= 4.3210 x 10^33 / 6.023 x 10^23 moles) of strontium chromate. ` `

Strontium chromate is an ionic compound between strontium cation and chromate anion. Strontium, being a metal readily gives up electrons to form a cation. These donated electrons are accepted by anions such as chromate (which is itself a molecule composed of chromium and oxygen), thus forming an ionic bond.

Hope this helps. 

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