N2 (g) + 3H2 (g)  2NH3 (g) ΔrS = - 201 J K−1mol−1 ΔrH = - 99.3 kJ mol-1 d)    A gas mixture of total pressure 56 kPa consisting of 1 part N2 to 3 parts H2 was obtained in the reaction above. Calculate the partial pressure of nitrogen and hydrogen gas in the gas mixture  e)    How much work is done when a piston is compressed from 9.87 L to 2.56 L under constant atmospheric pressure (1.013 × 105 Pa)?  f)    Which intermolecular forces will be dominant between NH3 molecules? Which has the higher boiling point: NH3 or PH3? Briefly justify your answer  g)    What intermolecular forces will be dominant between N2 molecules? Briefly justify your answer.

Calculate the enthalpy change when a 2.841 g sample is burned in excess oxygen to form co2 and h20 in a reaction at constant pressure and 298k  use the following information: co2=-393.51Kj h20=-285.83Kj o2= 0 Kj C6h6= 49.03 Kj

For the combustion of 1.00 mol of toluene, C7H8 , at 25 °C and 1.00 bar, calculate the work that must be done against the atmosphere for the expansion of the gaseous products. ?=   Using the enthalpy of formation data, calculate the standard enthalpy of reaction, Δ?° . Δ?°=   Calculate the change in internal energy, Δ?° , of the system. Δ?°=

A 0.576 g sample of liquid C5H12 was combusted using excess oxygen gas inside a bomb calorimeter, with the products being carbon dioxide gas and liquid water. The calorimeter's heat capacity is 4.957 kJ °C^-1. If the temperature inside the calorimeter increased from 25.0 °C to 35.1 °C, determine A,U for this reaction in kl mol (with respect to C3H12). Do not worry about how realistic the final answer is.

A mole of sodium met is added to water How much work is done on the atmosphere by the subsequent reaction if the temperature is 25 C°

A student finds that 24.96 g of water at 24.9 °C (density= 0.9971 g/cm3) is required to completely fill an empty flask. The water is removed and completely dried; granular solid copper weighing 51.24 g is then added to the flask. With the copper present in the flask, it was determined that 19.24 g of water was required to fill the remaining space in the flask completely. Show all work and determine the following:   A. Volume of the empty flask          24.96g / 0.9971= 25.03mL   B. Volume of the copper         19.24g x 0.9971=19.18mL water          25.03mL – 19.18 mL = 5.84mL copper   C. Density of the copper         51.24g / 5.84ml = 8.77g/ml   D. If this flask could be filled completely with solid copper, what would be the mass of that copper?

Describe the relationship of enthalpy, work, and internal energy. Calculate the AU for these reactions and determine if these reactions do work on the surroundings. The First Law of Thermodynamics states AU = Q + W. Imagine a container of gas with a moveable piston (shown below). Heat is transferred into the system ( ). The gas molecules will expand and put pressure on the piston and move it. The gas is doing work on the piston which is A) -Q; +W В) -Q; -W Нeat Added C) +Q; -W D) +Q; +W