Using the information (valid at 25 ºC): ΔfHº(NO2,g) = 33.18 kJ / mol ΔfHº(N2O4,g) = 9.16 kJ / mol and assuming that the molar heat capacities at constant pressure Cp, m(NO2,g) = 37.20 J / (K mol) Cp, m(N2O4,g) = 77.28 J / (K mol) are independent of temperature, calculate the standard enthalpy of the reaction 2 NO2(g) → N2O4(g) at 100 ºC and 1.0 bar.

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water

Which polymers are most closely related? a. protein and nucleic acids b. cellulose and starch c. nucleic acids and starch d. nucleic acids and cellulose