Cho recorded the weather in her town for a week. She wrote down her observations in the table below. Mon Tue Wed Thu Fri Sat Sun
1 answer:
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Answer:
Option (4) is correct
Explanation:
- NaCl is an ionic solid.
and
ions are held together by strong coloumbic attractive force. Hence NaCl has highest boiling point'
- Ar is a monoatomic molecule. Hence only weak london dispersion force exists between Ar atom/molecules. Hence it requires lowest amount of energy to boil and thereby possess lowest boiling point.
and
are polar protic molecules. Hence they possess london dispersion force, dipole-dipole force and hydrogen bonding as intermolecular forces.
- Dipole-dipole force is stronger in
Hence order of boiling point :
Answer : The energy required is, 574.2055 KJ
Solution :
The conversions involved in this process are :
Now we have to calculate the enthalpy change or energy.
where,
= energy required = ?
m = mass of ice = 1 kg = 1000 g
= specific heat of solid water =
= specific heat of liquid water =
n = number of moles of ice =
= enthalpy change for fusion = 6.01 KJ/mole = 6010 J/mole
Now put all the given values in the above expression, we get
(1 KJ = 1000 J)
Therefore, the energy required is, 574.2055 KJ