Determine if the following reaction will occur at room temperature (298 K) by calculating \Delta G: (hint - look - up Hf, and change its sign to 'reverse' the reaction) H2O(1) H2(g) + 1/2O2(g)

Consider the reaction N2O(g)+NO2(g)3NO(g)K=4.41019 (a) Calculate G for the reaction at 25C. (b) Calculate G f for N2O at 25C.

Heater Meals are food packages that contain their own heat source, lust pour water into the heater unit, wait a few minutes, and voila! You have a hot meal. Mg(s) + 2 H2O() Mg(OH)2(s) + H2(g) (a) Confirm that this is a product-favored reaction at equilibrium at 25 C. (b) What mass of magnesium is required to produce sufficient energy to heat 225 mL of water (density = 0.995 g/mL) from 25 C to the boiling point?

The equilibrium constant for a certain reaction increases by a factor of 6.67 when the temperature is increased from 300.0 K to 350.0 K. Calculate the standard change in enthalpy (H) for this reaction (assuming H is temperature-independent).

Predict the sign of S, if possible, for each of the following reactions. If you cannot predict the sign for any reaction, state why. a 2SO3(g)2SO2(g)+O2(g) b C2H5OH(l)+3O2(g)2CO2(g)+3H2O(l) c P4(g)P4(s) d 2NaHCO3(s)Na2CO3(s)+H2O(g)+CO2(g)

On the basis of your experience, predict which reactions are spontaneous: (a) PbO2(s)Pb(s)+O2(g)(b) N2(l)N2(g) at 25C (c) C6H12O6(s)C6H12O6(l) at 25C (d) Ca2+(aq)+CO32(aq)CaCO3(s)

Given the following data 2O3(g) 3O2(g)H = 427 kJ O2(g) 2O(g)H = 495 kJ NO(g) + O3(g) NO2(g) + O2(g)H = 199 kJ Calculate H for the reaction NO(g) + O(g) NO2(g)

Using values of fH and S, calculate rG for each of the following reactions at 25 C. (a) 2 Na(s) + 2 H2O() 2 NaOH(aq) + H2(g) (b) 6 C(graphite) + 3 H2(g) C6H6() Which of these reactions is (are) predicted to be product-favored at equilibrium? Are the reactions enthalpy- or entropy-driven?

In the laboratory, POCl3 (phosphorus oxychloride) is used in the manufacture of phosphate esters, which are used in flame retardants and pesticides. It can be prepared by the following reaction at 25C: 2PCl3(g)+O2(g)2POCl3(g) H=572kJ;G=518.7kJ(a) Calculate S. Is the sign reasonable? (b) Calculate S for POCl3. (c) Calculate for POCl3.

9.96 Most first aid "cold packs" are based on the endothermic dissolution of ammonium nitrate in water: NH4NO3(s)NH4+(aq)+NO3(aq) H= 25.69 kJ A particular cold pack contains 50.0 g of NH4NO3 and 125.0 g of water. When the pack is squeezed, the NH4NO3dissolves in the water. If the pack and its contents are initially at 24.0°C, what is the lowest temperature that this bag could reach? (Assume that the ammonium nitrate solution has a specific heat of 4.25J g-l K-l, and that the heat capacity of the bag itself is small enough to be neglected.)