For the process: O2(g) → 2O(g)   ΔH° = 498 kJ/mol What would be the predicted sign of ΔS°rxn and the conditions under which this reaction would be spontaneous?

Which gas, helium or argon, effuses faster under the same conditions and by how much?          

How many protons, neutrons, and electrons are in one atom of ?

Which aqueous solution will have the highest freezing point?

What is the percent yield when 1.72 g of H2O2 decomposes and produces 375 mL of O2 gas measured at 42 oC and 1.52 atm?  The molar mass of H2O2 is 34.02 g/mol. 2H2O2(aq) → 2H2O(l) + O2(g)  

Which aqueous solution all at 25 oC will have the highest osmotic pressure?

The reaction of: 2N2O5(g) → 4NO2(g) + O2(g) is experimentally determined to be first order.  What experimental data would support this conclusion I. Plotting 1 / vs. time would be linear II. The half-life is independent of the initial concentration III. Doubling the initial concentration of N2O5 would yield a quadrupled initial rate.  

How many hydrogen atoms are in a 1.0 g sample of acetic acid, CH3COOH? The molar mass of acetic acid is 60.06 g/mol. NA = 6.022 x 1023 mol-1

What is the formula for the compound disulfur dichloride?

The neutralization reaction of HNO2 and a strong base is based on: HNO2(aq) + OH–(aq) → H2O(l) + NO2–(aq)   K = 4.5×1010 What is the standard change in Gibbs free energy at 25 oC?