An aqueous magnesium chloride solution is made by dissolving 7.15 moles of MgCl2 in sufficient water so that the final volume of
1 answer:
Answer:
2.86mol/L
Explanation:
Given parameters:
Number of moles of MgCl₂ = 7.15moles
Volume of solution = 2.50L
Unknown:
Molarity of the MgCl₂ solution = ?
Solution:
The molarity of a solution is the number of moles of solute found in a given volume.
Molarity =
Insert the parameters and solve;
Molarity = = 2.86mol/L
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Answer:
a) <u>1.740 g</u> of F- must be added to a cylindrical water reservoir
b) Grams of sodium fluoride, NaF, that contain this much fluoride:
3.84 g
Explanation:
Step 1. calculate the volume of the tank:
Volume of cylinder =
,
Here r = radius of the cylinder = d/2
h = depth = 21.80m
= 168 m
Volume =
2.Convert ppm to g/m3 and Solve for mass of F-
Because both ppm and g/m3 are same quantity .
mass of F- required = 1.740 g
3. Apply <u>mole concept </u>to calculate grams of sodium fluoride produced
mass of 1 mole of F2 = 38 g
mass of 1 mole of NaF = 42 g
(from periodic table calculate molar mass)
Here 1 mole of F2 produce = 2 mole of NaF
So,
38 g of F2 produce = 2 x 42 g of NaF
38 g of F2 produce = 84 g of NaF
1 g of F2 produce = 84/38 g of NaF
1.74 g F2 produce =
1.74 g F2 produce = 3.84 g of NaF
3.84 g of NaF is produced
The axial positions the bond angle is 120 degrees and in equatorial positions the bond angle is 90 degrees.
Functional groups on central atom gets reduce if lone pairs are added.
Explanation:
The number of lone pairs and base pairs of electrons tells the geometry of the molecule.
VSEPR Theory helps to know the lone pairs and bond pair electrons on the centre atom of the molecule.
Example of molecule containing 5 electron pairs can have four bond pairs and 1 lone pair.
eg: Cl
the repulsion is shown as
lp-lp> lp-bp>bp-bp
These are in equatorial position because of the repulsion of lone pairs.
It can have 2 lone pairs and 3 bond pairs. eg. Xe
Lone pairs in this is also in equatorial position as
lp-lp> lp-bp> bp-bp
In axial positions the bond angle is 120 degrees
in equatorial positions the bond angle is 90 degrees, due to the repulsion in lone pair of electrons.
If 1 lone pair is there it can be replaced by bonding with hydrogen.
If 2 lone pairs are there then bonding with oxygen is there. The covalent bond is formed.