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premedchemist

The units of molarity are moles/liter, so you want to find the number of moles in one liter of a substance.
The molar mass of Sodium Chloride (NaCl) is approximately 58.5, gotten from the sum of the molar masses of sodium and chlorine
Molar Mass sodium = 23.0 grams/mole
Molar Mass chlorine = 35.5 grams/mole
Molar mass sodium chloride = 23.0 g/mol + 35.5 g/mol = 58.5 g/mol
Convert 58.5 grams to moles: (58.5 grams)/(58.5 grams/mol)
Leaves 1.00 moles of NaCl
Divide that by the number of liters of solution (0.500 liters)
(1.00moles)/(0.500 liters) = 2.00 moles/liter is your molarity

Cricetus

The molarity of the solution is "2.00 M".

Given values,

Mass of NaCl,

  • 58.5 g

Molar mass of NaCl,

  • 58.5 g/mol

Volume of solution,

  • 0.5 L

→ The molarity of the solution will be:

\(M = \frac{Mass}{Molar \ mass}\times \frac{1}{V}\)

    \(= \frac{58.5}{58.5 }\times \frac{1}{0.5 }\)

    \(= \frac{1}{0.5}\)

    \(= 2.00 \ mole/L\)

or,

    \(= 2.00 \ M\)

Thus the response above is correct.

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