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26 February, 18:47

What mass of ammonium thiocyanate must be used if it is to react completely with 6.5 g barium hydroxide octahydrate?

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  1. 26 February, 19:17
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    The reaction equation is:

    Ba (OH) ₂ * 8H ₂ O + 2NH ₄ SCN (s) → Ba (SCN) ₂ (s) + 10H ₂ O (l) + 2NH ₃ (g)

    The molecular mass of barium hydroxide octahydrate is 315 grams / mol.

    We determine the number of moles of barium hydroxide octahydrate:

    moles = mass / Mr

    moles = 6.5 / 315

    moles = 0.02 mol

    Using the equation, we can determine that the moles of ammonium thiocyanate required are:

    2 * 0.02 = 0.04 mol

    The molecular weight of ammonium thiocyanate is 76.1 grams / mol

    Weight = moles * Mr

    Weight = 0.04 * 76.1

    Weight = 3.04 grams

    3.04 grams of ammonium thicyanate are required.
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