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)

Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.

Becoming a subscriber
Or look for another answer

×

Login

Login or Sign up for access to all of our study tools and educational content!

Forgot password?
Register Now

×

Register

Sign up for access to all content on our site!

Or login if you already have an account

×

Reset password

If you have an active account we’ll send you an e-mail for password recovery

Or login if you have your password back