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Chemistry Questions and Answers

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1)Assume that the electron in He+ ion is excited to the second orbit (n = 2).Calculate the following: I) the radius of the orbit. ii)the velocity of the electron. iii)the potential energy of the electron. iv)the kinetic energy of the electron. [HINT:use equations derived for hydrogen atom] 2) (a) explain the shapes of 1s and 2ps orbitals of an atom with one electron. (b) calculate the de Broglie wavelength of Li+ ion, if it moves with the velocity of 2 * 10^4 m S^-1. assume that the mass of Li+ ion is equal to two mass of Li atom.
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C3H8 + 5O2 → 3CO2 + 4H2O What is the theoretical yield of in grams of water if the reaction started with 14.8 g C3H8 and 3.44 g O2?
Below is the cooling curve for t-butyl alcohol. Which letter corresponds to a mix of the solid and liquid phases of t-butyl alcohol?
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What is Eo for the cell Ag l AgBr(s) I Br- (a1), Fe3+ (a2), Fe2+ (a3) l Pt . Given : Standard half-cell reduction potentials as
AgBr l Ag, (Eo)1/2 = 0.0713 V, Fe3+ l Fe2+, (Eo)1/2 = 0.771 V.
If a1 = 0.34, a2 = 0.1 & a3 = 0.02, then find Q, the reaction Quotient is Q = 0.588. Hence find E for the cell.
Suppose we start with CO2 and H2, both at a concentration of 0.100 M. When the system reaches equilibrium, what are the concentrations of products and reactants?
How many moles of silver (I) sulfide, Ag2S, are formed when a 269.7 g sample of silver tarnishes in the presence of sulfur?

Please explain how to solve this problem
Why N2 is kept in brown bottle?
1 mole = 22.4 or 22.4L = 1 mole
PCl3(g)+Cl2(g)<----&gt;PCl5(g) Kc=20 @ 240 C

If a 1.0 L container contains 0.25 mol of PCl5 at 240 C, how many moles of it dissociate to form PCl3 and Cl2?
On addition of a solute, the vapor pressure of a liquid reduced to 9/10th of its original value. If 2 gram of solute (molar mass = 100) is added to 100 grams of the liquid to achieve that reduction then find the molar mass of the solvent assume ideality.
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