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83. Many famous “rubies” are in fact spinels, which look like rubies but are far less valuable. Spinels consist primarily of MgAl2O4, whereas rubies are primarily Al2O3. If the Timur Ruby, a 361-carat spinel, were pure MgAl2O4, how many moles of MgAl2O4 would it contain? (There are exactly 5 carats per gram.) 91. A multivitamin tablet contains 0.479 g of CaHPO4 as a source of phosphorus. The recommended daily value of phosphorus is 1.000 g of P. a. Write a conversion factor that relates moles of phosphorus to moles of calcium hydrogen phosphate. b. Calculate the mass in grams of phosphorus in 0.479 g of CaHPO4. c. What percentage of the daily value of phosphorus comes from this tablet?

83. Many famous “rubies” are in fact spinels, which look like rubies but are far less valuable. Spinels consist primarily of MgAl2O4, whereas rubies are primarily Al2O3. If the Timur Ruby, a 361-carat spinel, were pure MgAl2O4, how many moles of MgAl2O4 would it contain? (There are exactly 5 carats per gram.) 91. A multivitamin tablet contains 0.479 g of CaHPO4 as a source of phosphorus. The recommended daily value of phosphorus is 1.000 g of P. a. Write a conversion factor that relates moles of phosphorus to moles of calcium hydrogen phosphate. b. Calculate the mass in grams of phosphorus in 0.479 g of CaHPO4. c. What percentage of the daily value of phosphorus comes from this tablet?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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83. Many famous “rubies” are in fact spinels, which look like rubies but are far less valuable. Spinels consist primarily of MgAl2O4, whereas rubies are primarily Al2O3. If the Timur Ruby, a 361-carat spinel, were pure MgAl2O4, how many moles of MgAl2O4 would it contain? (There are exactly 5 carats per gram.)

91. A multivitamin tablet contains 0.479 g of CaHPO4 as a source of phosphorus.

The recommended daily value of phosphorus is 1.000 g of P.
a. Write a conversion factor that relates moles of phosphorus to moles of

calcium hydrogen phosphate.
b. Calculate the mass in grams of phosphorus in 0.479 g of CaHPO4.
c. What percentage of the daily value of phosphorus comes from this tablet?

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