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Using data from the following reactions and applying Hess's law, calculate the heat change for the slow reaction of zinc with water (answer must be in kJ/mol Zn):
Zn(s) + 2 H2O(l) ----> Zn^2+(aq) + 2 OH-(aq) + H2(g) (ΔHrxn = ?)
H+(aq) + OH-(aq) ----> H2O(l) (ΔHrxn,1 = -56 kJ/mol H2O)
Zn(s) ----> Zn^2+(aq) (ΔHrxn,2 = -153.9 kJ)
1/2 H2(g) ----> H+(aq) (ΔHrxn,3 = 0.0 kJ)
Calculate Delta E for a system that absorbs 744.0 kJ of heat from its surroundings and does 277.0 kJ of work on its surroundings.
the solubility product constant for aio32is 1.55x10-6. what volume in ml of 5.29x10-2 ms2o32- would be required
the hydrated radius of hemoglobin is found to be 3.55 nm. How many water molecules hydrate a hemoglobin molecule?
When performing your experiment, you add your first drop of oleic acid/benzene solution, and a lens forms immediately. What is wrong with your setup, and how can it be corrected
A 4.61*10^-3 mole sample of HY is dissolved in enough H20 to form .086L of solution. If the pH of the solution is 2.64, what is the K_a of HY
A solid sphere of a metal with a mass of 0.7371kg has a diameter of 50.0mm. Calculate the density of metal. Calculate the moles of FeSO4 present in an iron tablet containing 400mg FeSO4.
either through the formation of a single molecule or by bonding to another atom of similar electronic geometry and results in an arrangement of orbitals that is possible within the valence shell of an atom
Caluclate the energy requried to raise the temperture of 1.0 mol Ag by 1.0 C. c.it takes 1.25kj of energy to heat a sample of pure silver from 12.0 C to 15.2 C. Calculate the mass of the sample of silver.
Calculate the pH if 0.03 mol HCl is added to 0.500 L of a buffer solution that is 0.24 M NH3 and 0.20 M NH4Cl. For NH3 Kb= 1.8 x 10-5.
Calculate the empirical and molecular formulas of a compound, C?H?Cr?, given the following: 1) The compund contains 73.94% C and 8.22% H. The rest is Cr. 2) At 25 degrees celius, the osmotic pressure of a solution containing 5.00 mg of the unknown..
the change in energy of each system and also of the composite system. the change in entropy of each system an also of the composite system.
the percentage of se in peroxidase anhydrous enzyme is 0.5 by weight atomic weight 78.4. then minimum molecular weight
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