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Chemistry

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Consider the following chemical equation.
Na3PO4(aq) + Ca(OH)2(aq) → Ca3(PO4)2(s) + NaOH(aq)
How many grams of calcium hydroxide must react to give 2.81 g of Ca3(PO4)2?

please explain step by step

  • Chemistry -

    You first need to balance the equation.

    This will give you the ratio of moles of Ca(OH)2 to Ca3(PO4)2.

    calculate the molecular mass of
    Ca(OH)2 (=Mp) and Ca3(PO4)2 (=Mo)

    from the molecular mass (Mp) of Ca3(PO4)2 calculate the number of moles

    number of moles = 2.81/Mp

    using the ratio from the equation calculate the number of moles (Mo) of Ca(OH)2 needed to form the 2.81/Mp moles

    the mass required is then

    Mo x molecular mass of Ca(OH)2

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