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CHM130 Lesson 8 AYL

QuestionAnswer
When iron is produced from hematite, the following reaction occurs. How many grams of Fe are obtained from 50.0 g of hematite in this process? Fe2O3 + 3CO ® 2Fe + 3CO2 You have to calculate the percentage of iron in the iron oxide: (mmFe) 55.84 /(mmFe2O3) 159.68 *2 (because you produce 2 mols of Iron) *100 = 69.94% 50g*69.94/100 = 34.94g obtained of Iron
If 132.0 g CuO is reacted with 5.000 g H2, what mass of Cu would be prepared by the following reaction? CuO + H2 ® Cu + H2O moles CuO = 132.0 g / 79.5454 g/mol = 1.66 moles H2 = 5.000 g/ 2.106 g/mol = 2.48 ( in excess) moles Cu = 1.66 mass Cu = 1.66 mol x 63.546 g/mol =105.5 g
Sugar cane produces sucrose (C12H22O11) from water and carbon dioxide through photosynthesis: 12CO2 + 11H2O ® C12H22O11 + 12O2 If the reaction consumes 30.0 g of carbon dioxide and produces 6.84 g of sucrose, what is the percent yield? Molar mass CO2 = 12.011+15.99*2 = 44.009g/mol Molar mass C12H22O11 = 12.001*12+1.008*22+15.999*11= 342.297g/mol 30g CO2 = 30/44.009 = 0.682mol 0.682mol CO2 will produce : 0.682/12 = 0.0568mol sucrose 0.0568mol sucrose = 0.0568*342.297 = 19.445g su
Balance the following chemical equations: CaCl2 + Na2SO4 ® CaSO4 + NaCl CaCl2 + Na2SO4 = CaSO4 + 2 NaCl
Al + O2 ® Al2O3 4 Al + 3 O2 = 2 Al2O3
KI + Cl2 ® KCl + I2 2 KI + Cl2 = 2 KCl + I2
The heads of matches are made with P4S3. This material is made by heating a mixture of red phosphorus and sulfur: 8P4 + 3S8 ® 8P4S3 If a match company uses 5435 grams of phosphorus (P4) with an excess of sulfur, how many grams of P4S3 can be made? P4 MW = 123.88 g/mol S8 MW = 256.48 g/mol P4S3 MW = 220.06 g/mol (5435 g P4 / 123.88 g/mol) = 43.87 moles P4 43.87 moles P4 x 220.06 g/mol P4S3 = 9654.03 g P4S3
Flashlights use magnesium because of the bright light that is formed when it burns. How many grams of magnesium oxide will be produced if 0.432 g Mg is reacted with 0.130 g O2? 2Mg + O2 ® 2MgO 0.00876 mol MgO x (40.31 g MgO / 1 mol MgO) = 0.353 g Mg [Cancel moles of Mg] The reaction yields approximately 353 milligrams of magnesium oxide.
Created by: jessicayanes