Physical Chemistry Answers

Explain the principle of radioactive dating.

A sample of 2,4-hexadiene in methanol in a 2.5 cm cell shows an
absorbance of 0.65 at 240.0 nm. What is the concentration of the
diene? The molar absorption at this wavelength is 12100 dm3 mol1
cm1
.

Derive an expression for the Beer-Lambert law.

Why does vibrational fundamental frequency decreases with the increase in
masses of bonding atoms? Explain with suitable examples.

What is zero point energy? Calculate the number of normal modes of
vibration for the following compounds:
(i) PF3 (ii) ClNO (iii) XeF2

Given that the spacing of the lines in the microwave spectrum of 27Al1H is
constant at 12.60 cm1
. Calculate the moment of inertia and bond length of
the molecule.

Among the molecules given below, identify those which are microwave
active. Justify your answer.
I2, HBr, CO2, CS2, NO

Define following terms:
(i) molar magnetic susceptibility
(ii) chiral carbon.

On the basis of dipole study, predict whether HF compound is purely ionic
or polar covalent. The bond length of HF is 92 pm and dipole moment is
1.92 D.

Predict the hybridization of each carbon in the acetate ion.