Why does hair take longer to dry after a shower on days with high relative humidity
1 answer:
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Answer:
The ¹³C-NMR Spectrum of <em>tert</em>-butyl alcohol will show only two signals.
(i) Signal at around 31 ppm:
This signal towards upfield is for the carbon atoms which are more shielded and are having rich electron surroundings. The height of peak at y-axis shows the number of carbon atoms as compared to other peaks. In this case it is three times the height of second signal hence, it shows that this peak corresponds to three carbon atoms.
(ii) Signal at around 70 ppm:
This signal towards downfield is for the carbon atom which is more deshielded and is having electron deficient surrounding. As compared to the second signal the height of this peaks corresponds to only one carbon. And the deshielded environment shows that this carbon is directly attached to an electronegative element.
<u>Answer:</u> The amount of heat absorbed is 141.004 kJ.
<u>Explanation:</u>
In order to calculate the amount of heat released while converting given amount of steam (gaseous state) to ice (solid state), few processes are involved:
(1):
(2):
(3):
(4):
Calculating the heat absorbed for the process having the same temperature:
......(i)
where,
q is the amount of heat absorbed, m is the mass of sample and is the enthalpy of fusion or vaporization
Calculating the heat released for the process having different temperature:
......(ii)
where,
= specific heat of solid or liquid
are final and initial temperatures respectively
- <u>For process 1:</u>
We are given:
Putting values in equation (i), we get:
- <u>For process 2:</u>
We are given:
Putting values in equation (i), we get:
- <u>For process 3:</u>
We are given:
Putting values in equation (i), we get:
- <u>For process 4:</u>
We are given:
Putting values in equation (i), we get:
Calculating the total amount of heat released:
(Conversion factor: 1 kJ = 1000J)
Hence, the amount of heat absorbed is 141.004 kJ.