study questions 3 - 5. The atomic weight of K is 39, and of...

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Study questions 3 1. A pH of 3 indicates that the concentration of H+ is: a. 3 M e. log3 M b. 14-3=11M d. 10exp-11 M c. 10exp-3 M 2. If he concentration of H+ is very high the concentration of OH- will be: a. also very high e. cannot be predicted b. medium d. there are not OH- in solution c. very low 3. A mole of a compound defines a number of molecules: a. variable according to weight e. identical to the number of bonds x 12.34exp17 b. identical to those of 1L of H20 d. identical to the sq.root of bonds x 12.34exp17 c. fixed for any compound 4. Molarity is defined as the number of: a. atoms in a molecule e. molecules in 1L of solution b. bonds in a molecule d. molecules x bonds in 1L of solution c. moles in a L of solution
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Unformatted text preview: 5. The atomic weight of K is 39, and of Cl is 23. What amount of KCl is required to make 1L of 0.5M solution? a. 39 e. 62 b. 23 d. 31 c. 15 The molecular mass (=weight) of guanosine is 283. The single stranded DNA polymer ATGC has a molecular mass of 1173. The following 6. If you add 141.5 g of guanosine to 500 ml of water the molarity of that solution is a. 0.1 e. 1 b. 0.2 d. 2 c. 0.5 7. Your task is to add an amount of ATGC polymer to 1 L of water such that the guanosine com-ponent of the ATGC polymer has an identical concentration to that of the free guanosine in ques-tion 6. How many g of ATGC do you add? a. 141.5 e. 1173 b. 283 d. 2346 c. 586.5...
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