Question

Q.3. At 60 MHz, the shift of protons in Methyl bromide is 162 Hz from TMS while at 100
MHz the shift is 270 Hz. Calculate the values corresponding to both their
spectrometric frequency.
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Answer 1

Answer:

0.2 moles of solute (urea) =0.2 X molar mass of urea = 0.2 X 60=12 grams

0.8 moles of solvent (water) = 0.8 X molar mass of water = 0.8 X 18= 14.4 grams.

Mass of solution = Mass of solute + Mass of solvent

=12 + 14.4

26.4 grams

Volume =mass/density

=26.4/d mL =26.4/1000 dL

Molarity =0.1/26.4/1000 d

1/10 X 1000d/26.4

Molarity =100d/26.4

If density=0.21gm/mL putting this value in the above equation we get.

Molarity=100X0.21/26.4=0.79 M

if d=0.21 gm/mL Its volume=26.4/1000 X0.21

volume=0.12 L =0.12 X1000= 120 ml

Percentage of solution= mass/volume of solution

=26.4/120

=0.22%

Answer 2

Answer:

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