Question

L. Explain why a solution of 0.10 M HNO(ag) conducts more electrical current than does a solution of 0.10 M formic acid, HCOOH. 2. Explain the observed trend in melting points in the hydrogen halides. HI HBr 88.5 °C HF 83.1 "C 14.8° Ethanol has a heat of vaporization of 38.56 kJ/msol and a normal boiling point of 78.4°C. what is the vapor 3. pressure ofethanol at 15 ℃ ? 4. One type of household bleach contains 455% sodium hypochlorite(NaOCl) by mass. what is the molarity of NaOCI in this bleach? The density of the solution is 1.02 g/ml 5. The density of an unknown metal is 12.3 g/cm, and its atomic radius is 0.134 nm. It has a face-centered cubic unit cell. Find the atomic weight, in g'mole, of this metal 6. An aqueous solution containing 35.9 g of an unknown molecular (non-electrolytic) compound dissolved in 150.0 grams of water has a freezing point of-1.3°C. Calculate the molar mass of the unknown compound. 7. Balance the following redox equation occurring in an acidic solution. As(s)+NO'(aq) HAsO(ag)+NOG) 8. A solution containing 41.0 grams of acetone, CH.O, and 62.0 grams of H,O has a density of 0.926 g/ml. Calculate (a) the weight percentages of solute and solvent; (b) the mole fractions of solute and solvent; (c) the ppm of the acctone in the aqueous solution. 9. The equilibrium constant for the reaction H:(g) +g) 2HI(g) has a value of 54.6 at 699K. What are the equilibrium concentrations of H, Ia, and HI if the initial concentrations at this temperature are 0.0800M H2 and 0.0700 M 1 10. Find the pH and pOH of a solution prepared by dissolving 9.85 grams of NaOH into a total aqueous solution volume of 75.0 ml. 11. Using the data in Appendix B of your text, calculate the values of Ar, as , and ΔGo for the following reaction at 25 C. MgO(s) + CO (g) Mgcods)

Answer 1

Q1 A strong electrolyte is the one which does hundered percent ionization in solution or molten state. Between HNO3 and HCOOH. HNO3 is a more strong electrolyte and it dissociates more than that of HCOOH because Nitrogen is more electronegative and gives H+ easily so that is why it dissociates easily then that of HCOOH and conducts more electricity.

Q2. The general trend in melting point of the Hydrogen fluorides is somewat different becaus of the HF which has hydrogen bonding and due to it there is an increase in the melting point because due to hydrogen bonding much energy is needed to overcome the intermolecular forces which leads to increase in the melting point. The lowest melting point will be of the HI due to the weak intermolecular forces of attraction between the Hydrogen and The iodide. The trend will be as shown in the image below