3. Ten tablets with a total mass of 0.5894 g contained saccharin (C7H5NO3S) and were dissolved in wa
2. Which one of the following statements is incorrect?(A) Sodium arsenate has its formulas of Na3AsO
4. Consider three identical flasks filled with different gases: Flask A, CO at 760 torr and 0°C; Fla
5. At elevated temperatures, sodium chlorate decomposes to produce sodium chloride and oxygen gas. A
8. For the transition of n = 3 →n = 2 to occur in the hydrogen atom, the wavelength of the resulting
7. Which one of the following statements is incorrect?(A) An unknown nonmetal element with a valence
9. Which one of the following statements is correct?(A) SO4 is more energetically stable than XeO4.(
11. Consider three molecules: A, B, and C. Molecule A has a hybridization of sp3. Molecule B has two
12. A certain metal fluoride crystalizes in such a way that the fluoride ions occupy simple cubic la
13. The solubility of CaCl2 in cold water is 74.5 g per 100.0 g water. Assuming i = 2.6 for CaCl2, t
15. Suppose the reaction system 2HI(g)⇌H2(g) + I2(g) has already reached equilibrium. Which of the f
14.For the reaction A →products, successive half-lives are observed to be 10.0, 20.0 and 40.0 min fo
16. In a 0.10-M aqueous solution of pyridine (Kь = 1.7 × 10-9), the percentage of pyridine (C5H5N) t
17. Consider the titration of 40.0 mL of 0.200 M HCIO4 by 0.100 M KOH. After adding 10.0 mL of the K
18. Which of the following mixtures would result in buffered solutions when 1.0 L of each of the two
19. Which of the following substances does not show increased solubility as the pH of the solution b
20. For the reaction at 800 K: N2(g) + 3F2(g)→2NF3(g), an equilibrium mixture contains the partial p
21. Which one of the following statements is correct?(A) The value of S° for N2O at 0 K is greater t
23. A rock contains 0.688 mg of 206 Pb for every 1.000 mg of 238U present. Assuming that no lead was
24. Which of the following statements is correct?(A) The diamagnetic Ni(CN)42- ion has a tetrahedral