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A balloon contains a mixture of 3 gases: oxygen, helium, and nitrogen. If the partial pressures of the three gases in the balloon are 25 atm of O2, 7,600 torr of N2, and 20 atm of He, What is the total pressure inside the balloon?
An electrochemical cell consists of a nickel electrode in an acidic solution of 1.00M Ni(No3)2 connected by a salt bridge for a second component with na Al electrode in acidic solution of 1M Alcl3. Calculate the change in voltage when the cell described above has initial conc of 0.500M Ni(No3)2 and 0.750 M Alcl3?
During an experiment, 78.0 grams of CH4 reacts with 102.0 grams of O2 to produce water and carbon dioxide (CO2).
CH4 + 2O2 ---> 2H2O + CO2
Mole Ratio: Molar Mass Ratio:
1 mol CH4 = 1 mol CO2 1 mol CH4 = 16.01 g CH4
1 mol CO2 = 44.01 g CO2
Whenever solid calcium hydroxide, Ca(OH)2 (commonly known as lime) is present in water, it dissolves according to the equation:
Ca(OH)2(s) ↔ Ca2+(aq) + 2OH-(aq)
until the rate of the backward reaction equals the rate of the forward reaction and the solution is saturated.
A CAPE Chemistry student sought to determine the solubility product, Ksp of calcium hydroxide by titrating saturated solution of Ca(OH)2 against standardized hydrochloric acid solution, HCl. The saturated Ca(OH)2 solution was filtered, to remove excess solute, and 25mL aliquots were titrated against 0.10M HCl solution using bromothymol blue indicator.
- Calculate the concentration of Calcium Hydroxide.
- Use the equilibrium expression for the dissolution of Ca(OH)2 to determine the concentration of Ca2+ and OH–
- Calculate the Ksp for calcium hydroxide (state the units).
A CAPE Chemistry student sought to determine the solubility product, Ksp of calcium hydroxide by titrating saturated solution of Ca(OH)2 against standardized hydrochloric acid solution, HCl. The saturated Ca(OH)2 solution was filtered, to remove excess solute, and 25mL aliquots were titrated against 0.10M HCl solution using bromothymol blue indicator.
Calculate the concentration of Calcium Hydroxide.
Use the equilibrium expression for the dissolution of Ca(OH)2 to determine the concentration of Ca2+ and OH–. [3]
a voltaic cell is designed using the following reaction Zn+2Ag -zn 2+ + 2 Ag determine the standard voltage Eo for this reaction ?
As a variation of the preceding problem explore the consequences of increasing the energy separation of the ψB and ψC orbitals (use SAB and SAC equal to 0 for this stage of the calculation). Are you justified in ignoring orbital ψC at any stage?
Show, if overlap is ignored, (a) that if a molecular orbital is expressed as a linear combination of two atomic orbitals in the form ψ = ψA cos θ + ψB sin θ, where θ is a parameter that varies between 0 and π, with ψA and ψB are orthogonal and normalized to 1, then ψ is also normalized to 1. (b) To what values of θ do the bonding and antibonding orbitals in a homonuclear diatomic molecule correspond?
Estimate the orbital energies to use in a calculation of the molecular orbitals of HBr. For data, see Tables 8B.4 and 8B.5. Take β = −1.00 eV.
A reasonably reliable conversion between the Mulliken and Pauling electronegativity scales is given by eqn 9D.4. Use Table 9D.1 in the Resource section to assess how good the conversion formula is for Period 3 elements.
