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What is the molar mass of Fe(NH4)2(SO4)2?
Magnesium hydroxide, the active ingredient in milk of magnesia, neutralizes stomach acid, primarily HCl, according to the reaction:
Mg(OH)2 + 2 HCl à 2 H2O + MgCl2
How much HCl in grams can be neutralized by 11.4 g of Mg(OH)2?
Molar masses, g/mol: Mg(OH)2 = 58.33; HCl = 36.46
II) Find bond order for Be2.
III) Illustrate with an example each of the following with respect to co-ordination
compounds-
a) ionisation isomerism
b) geometrical isomerism
c) optical isomerism
IV) Write the possible isomers of the formula C5H10O2.
V) Explain the following terms-
a) Enantiomer
b) Diastereomers
c) Racemic mixture
I) Predict the NMR spectrum of CH3CH2OH.
II) “IR spectra is often characterised as molecular finger prints”. Comment on it.
III) C-C double bond and triple bonds of ethene (CH2=CH2) and acetylene do not absorb
IR energy why?
IV) Methane doesn’t absorb IR energy. Why?
V) What is the shift of the resonance from TMS of a group of nuclei with δ = 3.50 and
an operating frequency of 350 MHz?
A travelling wave is described by formula y(x, t) = A cos[(2pi/L).x - (2pi/T).t] where x and t represents position and time, respectively, and A is amplitude; L is wavelength and T is time period. What is the time period and wavelength of y(x, t) = 16 cos[(pi/30). x - (pi/10).t]
If the complex wave function of a particle has the value |W| at a point x, then the probability density of finding the particle is proportional to
Electrons with a kinetic energy of 6.023 x 10^4 J/mol are evolved from the surface of a metal, when exposed to a radiation of wavelength of 600 nm (photoelectric effect). The minimum amount of energy required to remove an electron from the metal atom is___. (h = 4.14*10^-15 eV-s, c = 3*10 ^8 m/s).
If a quantum particle of mass m with the Hamiltonian operator H = (-h^2/(2m))d^2/dx^2 has the wave function W(x) = sin(3 Pi x/2), then its (eigen) energy is
Iridium crystals have a cubic unit cell. The first six observed Bragg Diffraction angles from a powdered sample using X-rays with wavelength = 165.8 pm are 21.96o, 25.59o,37.65o,45.74o, 48.420 and 59.74o. Determine the type of cubic unit cell and its length.
a.) Metallic iron at 20oC is studied by the Bragg method, in which the crystal is oriented so that a reflection is obtained from the planes parallel to the sides of the cubic crystal, then from planes cutting diagonally through opposite edges, and finally from planes cutting diagonally through opposite corners. Reflections are first obtained at θ =11o 36’, 8o3’, and 20o26’, respectively. What type of cubic lattice does iron have at 20oC
b.) Metallic iron also forms cubic crystals at 1110oC, but the reflections determined as described in (a) occur at θ = 9o8’, 12o57’ and 7o55’ respectively. What type of cubic lattice does iron have at 1110oC?
c.) the density of iron at 20oC is 7.86g/cm3. What is the length of the side of the unit cell at 20oC
d.) What is the wavelength of the X-rays used?
e.) What is the density of iron at 1100oC?
