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Scan_Doc0026 - Exercises 19 Atoms of three different...

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19. Atoms of three different elements are represented by 0, 0, and Ll. Which compound is left over when three molecules of OLl and three molecules of DOll react to form ODLl and OLlLl? 20. In chemistry, what is meant by the term "mole"? What is the im- portance of the mole concept? 21. Which (if any) of the following is true regarding the limiting reactant in a chemical reaction? a. The limiting reactant has the lowest coefficient in a balanced equation. b. The limiting reactant is the reactant for which you have the fewest number of moles. c. The limiting reactant has the lowest ratio of moles available/ coefficient in the balanced equation. d. The limiting reactant has the lowest ratio of coefficient in the balanced equation/moles available. Justify your choice. For those you did not choose, explain why they are incorrect. 22. Consider the equation 3A + B ..... ,.C + D. You react 4 moles of A with 2 moles of B. Which of the following is true? a. The limiting reactant is the one with the higher molar mass. b. A is the limiting reactant because you need 6 moles of A and have 4 moles. c. B is the limiting reactant because you have fewer moles of B than A.
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