High-temperature superconducting oxides hold great promise
Chapter 3, Problem 111P(choose chapter or problem)
High-temperature superconducting oxides hold great promise in the utility, transportation, and computer industries.
One superconductor is \(\mathrm{La}_{2-x} \mathrm{Sr}_{x} \mathrm{CuO}_{4}\). Calculate the molar mass of this oxide when \(x = 0, x = 1, and x = 0.163\) (the last character- izes the compound with optimum superconducting properties).
Another common superconducting oxide is made by heating a mixture of barium carbonate, copper(II) oxide, and yttrium(III) oxide, followed by further heating in
\(\begin{aligned} \mathrm{O}_{2}: & \\ 4 \mathrm{BaCO}_{3}(\mathrm{~s})+6 \mathrm{CuO}(\mathrm{s})+\mathrm{Y}_{2} \mathrm{O}_{3}(\mathrm{~s}) & \rightarrow \\ 2 \mathrm{YBa}_{2} \mathrm{Cu}_{3} \mathrm{O}_{6.5}(\mathrm{~s})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) & \rightarrow 2 \mathrm{YBa}_{2} \mathrm{CU}_{3} \mathrm{O}_{7}(\mathrm{~s}) \end{aligned} \)
When equal masses of the three reactants are heated, which reactant is limiting?
(c) After the product in part (b) is removed, what is the mass percent of each reactant in the solid mixture remaining?
Equation Transcription:
La2-xSrxCuO4
O2:
4BaCO3(s) + 6CuO(s) + Y2O3(s)
2YBa2Cu3O6.5(s) + 4CO2(g)
2YBa2Cu3O6.5(s) + 2YBa2CU3O7(s)
Text Transcription:
La_2-xSr_xCuO_4
x = 0
x = 1
x = 0.163
O_2:
4BaCO_3(s) + 6CuO(s) + Y_2O_3(s) rightarrow 2YBa_2Cu_3O_6.5(s) + 4CO_2(g) 2YBa_2Cu_3O_6.5(s) + 1/2O_2(g) rightarrow 2YBa_2CU_3O_7(s)
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