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The standard reaction enthalpy for the decomposition of CaCl2_NH3 into CaCl2 and NH3 is nearly constant at +78 kJ/mol between 350 K and 470 K. The equilibrium pressure of NH3 in the presence of CaCl2-NH3 is 1.71 kPa at 400 K. Find an expression for the temperature dependence of Delta G of reaction in the same range.
According to the following thermochemical equation, what mass of H2O (in g) must form in order to produce 975 kJ of energy?
Solid sodium iodide is slowly added to a solution that is 0.0050 M Pb2+ and 0.0050 M Ag+. [Ksp (PbI2) = 1.4 × 10-8; Ksp (AgI) = 8.3 × 10-17] Calculate the Ag+ concentration when PbI2 just begins to precipitate.
Estimate the average spacing between water molecules in liquid water by making use of 2 pieces of information: (a) liquid water has a density of 1 g/cm^3
At a pressure of 1 atmosphere and a temperature of 25 °C, 500 cm3 of the gas HX has a mass of 0.400 g. Calculate the value of the relative atomic mass of X and hence identify element X.
Suppose that 0.92 of water condenses on a 85.0 block of iron that is initially at 22. If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ) of the iron block? (Assume a constant enthalpy ..
Calculate the molar solubility of AgI in 3.6 M NH3. The overall formation constant for Ag(NH3)2+ is 1.7 x 10^7.
Suppose a sample of solid hydrogen is held under an external pressure of 0.030 atm and heated from 5 to 300 K. What phase change(s), if any, will occur?
How many kilojoules of energy are required to heat 50.0 g of ethanol from -20.0°C to 68.0°C?
Compute the molar mass of vitamin C if a solution of 22.7 g in 100. g of water freezes at -2.40 oC. The Kf of water is 1.858 oC kg/mol.
The first-order decomposition of phosphene to phosphorus and hydrogen 4PH3(g) → P4(g) + 6H2(g)
Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.
A 530. g piece of copper tubing is heated to 92.0°C and placed in an insulated vessel containing 49.5 g of water at 39.5°C. Assuming no loss of water and heat capacity for the vessel of 10.0 J/K,
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