Author: Anonymous

The decomposition of hydrogen peroxide (H2O2(aq)) is proposed to follow a reaction mechanism of:                                                 Step 1:  H2O2(aq) + Br–(aq) 

The density of a 3.539 M HNO3 aqueous solution is 1.150 g∙mL–1 at 20 oC.  What is the molal concentration?  The molar mass of HNO3 is 63.02 g∙mol–1.  

For the reaction:  ½F2(g) ⇌ F(g), a reaction mixture initially contains 0.5 atm of F2(g) and 0.5 atm of F(g) in their standard states. If Kp = 7.55×10–2 at this temperature, which statement is true?

The reaction of NO(g) + Cl2(g) ⇌ NOCl(g) + Cl(g) is found to have an equilibrium constant of 1.1×108 at a particular temperature.  What does this mean?

A student conducts an experiment to determine the van’t Hoff factor for calcium nitrate.  The experimental data collected is shown in the table.  What is the experimentally determined value for the van’t Hoff factor, i, for calcium nitrate given this data?

Consider the ionization of nitrous acid at 25 °C:                                            HNO2(aq) + H2O(l) ⇌ H3O+(aq) + NO2–(aq)              ΔG° = 19.1 kJ·mol–1 What is the value of K for this equilibrium?

For the decomposition of mercury(II) oxide, HgO, to mercury and oxygen:                                            2HgO(s) → 2Hg(l) + O2(g) What is the standard change in entropy for this reaction? So / J∙mol–1∙K–1 HgO(s) 70.29 Hg(l) 76.02 O2(g) 205.14

Which acid is the weakest?

A buffer solution made with HOCl and NaOCl has a pH of 7.42. Which statement is true? Ka(HOCl) = 2.90×10–8  

A solution was made by adding 800 g of ethanol, C2H5OH, to 8.0×103 g of water.  How much would this lower the freezing point?  The freezing point depression constant, Kf, of water is 1.86 °C·m–1 and the molar mass of ethanol is 46.08 g∙mol–1.