Question

10.0 g of table salt, NaCl, is dissolved in water to a total volume of 125.0 mL. What is the resulting molar concentration of the table salt?Select one:O a0.73 MOb12.5 MO c.1.0 MOd 0.080 MO e. 1.37 M

Answer 1

Step 1

The molar concentration or molarity is defined as:

Molarity (M or mol/L) = moles of solute/volume of solution (L)

L means liters.

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Step 2

Information provided:

10.0 g NaCl (solute)

Volume of solution (L) = 125.0 mL x (1 L/1000 mL) = 0.1250 L

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Information needed:

The molar mass of NaCl = 58.4 g/mol

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Step 3

Procedure:

The number of moles NaCl = mass/molar mass = 10.0 g/58.4 g/mol = 0.171 moles

Next,

Molarity = moles of NaCl/volume of solution (L) = 0.171 moles/0.1250 L

Molarity = 1.37 M

Answer: e. 1.37 M