What is the molarity of a solution made from 0.250 mol of sodium hydroxide and 500 mL of water?

Explanation:

Molarity is a measure of concentration in moles per liter.

There are 0.250 moles of sodium hydroxide (NaOH) and 500 milliliters of water. We need to convert milliliters to liters. Remember that 1 liter contains 1000 milliliters.

Now we have the values to solve for molarity:

Substitute the values into the formula.

Divide.

The molarity of the solution is 0.5 M NaOH

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the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)