Author: Anonymous

What is the oxidation number of nitrogen in the nitrate ion?   

In which compound is the percent composition by mass of nitrogen the highest?    

Of the substances below, which will hydrogen bond with water?   

For the reduction of silver with hydrogen: 2Ag+(aq) + H2(g) → 2H+(aq) + 2Ag(s) Given the thermodynamic data in the table, what is the standard change in Gibbs free energy for this reaction at 298 K?   ΔHfo  (kJ/mol) So (J/mol∙K) Ag+(aq) 105.58 72.68 Ag(s) 0 42.55 H2(g) 0 130.68 H+(aq) 0 0  

The gases: F2, H2, N2, and O2 at STP are represented in the plot. Which gas corresponds to curve II?   

What is the pH of a buffer made by combining 45.0 mL of 0.150 M nitrous acid and 20.0 mL of 0.175 M sodium nitrite? The Ka of nitrous acid, HNO2, is 4.5×10–4.

The systematic name for the compound Fe2(SO4)3 is ______.

Which arrow on the phase diagram corresponds to the particle-level phase change shown?       

The figure represents the initial contents of a reaction vessel mixture of nitrogen monoxide (NO) and oxygen (O2) at a pressure of 1 atm. Keeping the volume and temperature constant, what are the final total pressure (Ptot) and partial pressure of nitrogen dioxide (PNO2) when the reaction is complete (assuming a 100% yield)? 2NO(g) + O2(g) → 2NO2(g)   

If a 1.0 L flask is filled with 0.22 mol of N2 and 0.22 mol of O2 at 2000 °C, what is [NO] after the reaction establishes equilibrium? N2(g) + O2(g) ⇌ 2NO(g)    Kc = 0.10 at 2000 °C