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7 September, 10:04

How many moles are 1.20 x 1025 formula units of calcium iodide?

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  1. 7 September, 10:06
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    19.9 mol

    Explanation:

    Use Avogadro's number to convert formula units of CaI₂ to moles of CaI₂.

    1 mol CaI₂ ≡ 6.022 * 10²³ formula units CaI₂

    Moles of CaI₂ = 1.20 * 10²⁵ * (1 / 6.022 * 10²³)

    Moles of CaI₂ = 19.9 mol
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