Within a year after Bednorz and Muller’s initial discovery of high temperature superconductors, Wu and Chu had?
Within a year after Bednorz and Muller’s initial discovery of high temperature superconductors, Wu and Chu had discovered a new compound, YBa2Cu3O7, that began to superconduct at 100 K. If we wished to make 1.00 pound of YBa2Cu3O7, how many grams of yttrium must we buy?
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MWt of YBa2Cu3O7 = 666.1; At Wt of Y = 80.91; 1.00 lb = 454 g
80.91 g of Y are needed to produce 666.1 g of YBa2Cu3O7
80.91/666.1 g of Y are needed to produce 1 g of YBa2Cu3O7
∴ (80.91/666.1)×454 g of Y are needed to produce 454 g of YBa2Cu3O7
= 55.1 g (3 sig figs)
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