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1 year ago

Which way of expressing concentration includes (a) volume of solution;

Chemistry

1 answer:

Sergio [31]1 year ago

6 0

Molarity and normality are the ways of expressing concentration which includes the volume of the solution.

As we know,

Molarity is defined as the number of moles of solute dissolved in 1L of the solution. Thus,

M = no. of moles of solution/ Volume of solution on litres.

while, Normality is the number of gram equivalents of the solute dissolved per litre of the solution.

N = Gram equivalent of the solute/ volume of solution in litres.

while, the other concentration expressing terms such as mole fraction, molality includes the mass of the solution and solvent respectively.

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For a: The isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b: The isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c: The isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

Explanation:

The isotopic representation of an atom is: $_Z^A\textrm{X}$

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

For a:

We are given:

Number of neutrons = 78

Atomic number of iodine = 53 = Number of protons

Mass number = 53 + 78 = 131

Thus, the isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b:

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Mass number = 55 + 82 = 137

Thus, the isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

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