The electron pair geometry of a molecule is tetrahedral. What is its bond angle if it shows one lone pair of electrons and three
bonding pairs?
A) Less than 109.5°
B) More than 109.5°
C) Equal to 109.5°
D) Zero
A) Less than 109.5°
B) More than 109.5°
C) Equal to 109.5°
D) Zero
2 answers:
Answer: A) Less than 109.5°
Explanation: The electron pair geometry of a molecule is tetrahedral , which means the number of electrons is 4 that means the hybridization will be . and the bond angle will be 109.5°.
But as one lone pair of electrons and three bonding pairs are present, the fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the bond angle will decrease from 109.5° and molecular geometry will be trigonal pyramidal.
As in ammonia molecule, the bond angle reduces to 107° due to the presence of lone pair of electron in tetrahedral geometry.
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Answer:
The solution's new volume is 1.68 L
Explanation:
Dilution is the procedure to prepare a less concentrated solution from a more concentrated one, and simply consists of adding more solvent. So, in a dilution the amount of solute does not vary, but the volume of the solvent varies.
In summary, a dilution is a lower concentration solution than the original.
The way to do the calculations in a dilution is through the expression:
Ci*Vi=Cf*Vf
where C and V are concentration and volume, respectively; and the i and f subscripts indicate initial and final respectively.
In this case, being:
- Ci= 7 M
- Vi= 0.60 L
- Cf= 2.5 M
- Vf=?
Replacing:
7 M*0.60 L= 2.5 M* Vf
Solving:
Vf= 1.68 L
<u><em>The solution's new volume is 1.68 L</em></u>