Chem Problems - 2 O 3 (s) ---> 4Al (l) + 3O 2 (g)...

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1. The recommended daily allowance (RDA) of calcium is 1200 mg. Calcium carbonate contains 12% calcium by mass. How many grams of calcium carbonate are needed to provide the RDA of calcium? 10 g 2. Table salt (sodium chloride) is 42.7% sodium. How many grams of salt contain 76.0 g of sodium? 178 g 3. Calculate the number of moles of H2O formed when 0.200 mole of Ba(OH) 2 is treated with 0.500 mol of HClO3 according to the chemical reaction shown below. Ba(OH) 2 + 2HClO 3 ----> Ba(ClO 3 ) 2 + 2H 2 O 0.400mol 4. In the Hall process, anhydrous aluminum oxide is reduced to aluminum according to the chemical equation: 2Al
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Unformatted text preview: 2 O 3 (s) ---> 4Al (l) + 3O 2 (g) Calculate the mass of aluminum oxide reacted if 385 g of Al was produced and the percent yield was found to be 89.3%. 815 g 5. How many potassium atoms are present in 57.7 g of potassium hexafluoromanganate(IV), K 2 MnF 6 ? 2.81 x 10 23 atoms 6. Ethylene (C 2 H 4 ), an important industrial organic chemical, can be prepared by heating hexane (C 6 H 14 ) at 800 degrees Celsius: C 6 H 14---> C 2 H 4 + other products If the yield of ethylene production is 42.5% what mass of hexane must be reacted to produce 481 g of ethylene? 3.47 x 10 3 g C 6 H 14...
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This note was uploaded on 10/13/2010 for the course CHEM 101 taught by Professor Crago during the Spring '06 term at Loyola New Orleans.

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