Engineering Chemistry: Fundamentals and Applications 2nd. Edition by Shikha Agarwal | 9781108724449 | 1108724442 | Holooly

Intro to Chemical Engineering

Engineering Chemistry: Fundamentals and Applications

205 SOLVED PROBLEMS

Question: 17.6.2

A compound has the molecular formula C10 H14. It gives the following NMR data. (i) 0.88 δ (9 H singlet) (ii) 7.28 δ (5 H, singlet, aromatic protons) Assign structure to the compounds ...

Verified Answer:

(i) A nine proton singlet at 0.88 δ indicates the ...

Question: 18.1.4

Propionaldehyde decomposes to form carbon monoxide when irradiated with a light of wavelength 3020 Å. CH3CH2CHO hν → CH3CH3 + CO The quantum yield for the reaction is 0.54. If 14050 erg mol of light is absorbed in a given time, find the number of moles of carbon monoxide formed in the same time. ...

Verified Answer:

We know that one einstein

(\mathrm{E})=\fr...

Question: 18.1.3

1 × 10^-4 mole of a substance decomposed when it was irradiated with a light of wavelength 4800 Å. If the quantum efficiency of the reaction is 8, calculate the number of photons absorbed (Avogadro’s number = 6.02 × 10^23). ...

Verified Answer:

Quantum efficiency of the reaction = 8 Number of m...

Question: 18.1.2

0.002 moles of a substance X reacted in 18 min and 5 s. The number of photons absorbed per second is 2.0 × 10⁶. Calculate the quantum yield of the reaction (Avogadro’s number = 6.02 ×10^23). ...

Verified Answer:

\begin{aligned}\text{Number of molecules of...

Question: 18.1.1

Calculate the energy associated with (a) one photon and (b) one einstein of radiation of wavelength 7500 Å. h = 6.62 × 10^–27 erg-s; velocity of light c = 3 ×10^10 cm s^–1 ...

Verified Answer:

(a) Energy of photon

=\frac{h c}{\lambda}=...

Question: 17.7.2

A radiation of wave number 19865 cm^–1 is incident on a sample of ^14N2. If the equilibrium bond length is 110 pm, find the wave number of the scattered Stokes radiation for the transition J = 0 → 2. ...

Verified Answer:

For a homonuclear diatomic molecule the reduced ma...

Question: 17.7.1

A sample was irradiated by 4358 Å line of mercury. A Raman line was observed at 4452 Å. Calculate (a) Raman shift in cm^–1 (b) The wavelength at which antistoke line would appear in the Raman spectrum. ...

Verified Answer:

\begin{array}{l}\text { (a) } \Delta \bar{\...

Question: 17.6.3

The following compounds show only one signal in the NMR spectrum. Write their structural formulae (a) C5H12 (b) C2H6O (c) C2H4Br2 (d) C4H6 ...

Verified Answer:

(a)

C_5H_{12}

Single signal means t...

Question: 17.6.1

Predict the number of signals and multiplicity of the respective signals in the following compounds. (i) CH3CH3 (ii)Cl—CH2—CH2—CH2—Cl ...

Verified Answer:

(i) One signal Singlet as all hydrogens are equ...

Question: 17.5.2

The internuclear distance (bond length) of carbon monoxide molecule is 1.13 Å. Calculate the energy (in joules and eV) of this molecule in the first excited rotational level. Also calculate the angular velocity of the molecule. Given atomic masses of ^12C=1.99×10^-26 kg; ^16O = 2.66× 10^-26 kg. ...

Verified Answer:

\begin{array}{l}r=1.13 \mathrm{~A}^{\circ}=...

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