Calcium phosphate reacts with aqueous nitric acid to produce phosphoric acid and
calcium nitrate as shown in the equation.
Ca3(PO4)2 + 6HNO3 2H3PO4 + 3Ca(NO3)2.
Calculate the percentage atom economy for the formation of calcium nitrate in this
reaction.
Give your answer to 1 decimal place.
I thought the percentage atom economy was the mr of the desired product / total mr of reactants but i can't seem to get the right answer of 71.5 percent (492.3/688.3)
hi please help with my chemistry?
2016-10-18 3:34 pm
回答 (1)
2016-10-18 3:59 pm
✔ 最佳答案
Formula mass of Ca₃(PO₄)₂ = (40.1×3 + 31.0×2 + 16.0×8) g/mol = 310.3Formula mass of HNO₃ = (1.0 + 14.0 + 16.0×3) g/mol = 63.0
Formula mass of Ca(NO₃)₂ = (40.1 + 14.0×2 + 16.0×6) g/mol = 164.1
Ca₃(PO₄)₂ + 6HNO₃ → 2H₃PO₄ + 3Ca(NO₃)₂
Total formula masses of the reactants = (310.3 + 63.0×6) = 688.3
Formula mass of Ca(NO₃)₂ = 164.1 × 3 = 492.3
Atom economy of Ca(NO₃)₂ = (492.3/688.3) × 100% = 71.5%
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