a) →
b) →
<h3>What are half-reactions?</h3>
The half-reaction method is a way to balance redox reactions. It involves breaking the overall equation down into an oxidation part and a reduction part.
a)
→
=
= -0.83 - (-2.71) =1.88V
b)
→
=
=-0. - (0.8) =-0.8V
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The complete table is shown in figure
a) NH3 is polar as the bonds between N and H are polar. Due to asymmetry in the molecule the molecule is polar
The shape of molecule is trigonal pyramidal while its electronic geometry is tetrahedral.
b) CO2: it is a non polar molecule with polar bonds. The molecule becomes non polar as the dipole moment cancel each other. [Dipole moment is a vector quantity]
The shape is linear.
The depression in freezing point is related to molality of solution as follows:
Here, is freezing point depression constant, for cyclohexane it is equal to 20°C kg/mol.
The value of freezing-point depression is 2.5 °C, molality can be calculated as follows:
Molality is defined as number of moles of solute in 1 kg of solvent.
Here, solvent is cyclohexane, its volume is given 20.0 mL and density is 0.779 g/mol thus, mass of cyclohexane can be calculated as follows:
Converting this into kg,
Thus, 15.58 g will be 0.01558 kg.
Now, number of moles of unknown solute is related to its mass and molar mass as follows:
Putting the values of mass of solute which is 0.2436 or 0.0002436 kg
Now, expression for molality of solution is:
Putting all the values,
Or,
On rearranging,
Or,
Therefore, molar mass of unknown sample is 125 g/mol