What is the molarity of a sodium chloride solution that has 2.0 mol of sodium chloride dissolved in 0.25 L of water? Answer to two
significant figures.

Explanation:

Molarity is a measure of concentration in moles per liter, therefore the formula is:

There are 2.0 moles of solute or sodium chloride dissolved in 0.25 liters of water or solution.

Substitute these values into the formula.

Divide.

Molarity is measured in molars or M. 1 molar is equal to 1 mole per liter, so our answer is equal to 8 molars.

The original measurements of moles and liters have 2 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. There are no numbers to round, so we add a 0 in the tenths place.

The molarity of the solution is 8.0 M NaCl.

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