Question 3 (0.1 points)
1 answer:
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Answer:
<em>1) Molecular weight: 18g/mol </em>
<em>Density: at room temperature (25ºC) is 0.997g/mL</em>
<em>Moles: 0.55moles</em>
<em>2) Molecular weight: 182g/mol</em>
<em>Density: at room temperature (25ºC) is 1.11g/mL</em>
<em>Moles: </em>
Explanation:
1) The molecular formula of water is thus, the molecular weight is the sum of the weights of its atoms.
H: 1g/mol x 2 = 2g/mol
O: 16g/mol x 1 = 16g/mol
: 2g/mol + 16g/mol = 18g/mol
The density (δ) of water at room temperature (25ºC) is 0.997g/mL
Therefore, the weight (m) of 1mL of water is:
m = δ.V =
Multiplying the mass by its molecular weight gives the number of moles:
2) The molecular formula of benzophenone is thus, the molecular weight is the sum of the weights of its atoms.
C: 12g/mol x 13 = 156g/mol
H: 1g/mol x 10 = 10g/mol
O: 16g/mol x 1 = 16g/mol
: 156g/mol + 10g/mol + 16g/mol = 182g/mol
The density (δ) of water at room temperature (25ºC) is 1.11g/mL
Multiplying the mass by its molecular weight gives the number of moles:
Answer : The correct option is, (c) pyramidal
Explanation :
As we are given that a molecule in which the central atom forms three single bonds and has one lone pair that means the central metal atom has 3 bond pairs and 1 lone pair of electrons.
There are total 4 electron pairs. So, the hybridization will be and the electronic geometry of the molecule will be tetrahedral.
But as there are three atoms or bonds around the central atom and the fourth position occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be pyramidal.
Hence, correct option is, (c) pyramidal
