Practicecheexam2

practicecheexam2
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Unformatted text preview: 1) Aflatoxin B1 (C 17 H 12 O 6 ) is present in a blue mold that may grow on peanuts and rice stored improperly in humid conditions. The toxin affects the liver. In people who have been exposed to hepatitis aflatoxin is thought to be synergistic with the development of liver cancer. How many molecules are in 10 mg of aflatoxin B1? 2) By chemical analysis, the composition of calcium phosphate is 38.71% calcium, 20.00% phosphorous and 41.29% oxygen. Determine its empirical formula. 3) Balance the following equation and answer the questions below. A) FeS 2 + O 2--> Fe 2 O 3 + SO 2 B) If 0.032 moles of FeS 2 reacts completely. How many moles of SO 2 will be formed? 4) Which of the following is not a unit-conversion factor for the reaction 2 Al(OH) 3 + 3 H 2 SO 4---> Al 2 (SO 4 ) 3 + 3 H 2 O ? a. 3 mol H 2 SO 4 / 1 mol Al 2 (SO 4 ) 3 b. 1 mol Al 2 (SO 4 ) 3 / 2 mol Al(OH) 3 c. 3 mol H 2 SO 4 / 2 mole H 2 O d. 2 mol Al(OH) 3 / 3 mol H 2 SO 4 5) Consider the reaction below. Which statement correctly identifies the type of reaction that is occurring?...
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