define a mole of a substancea standard solution of naoh is prepared by dissolving 4 g of the dilute in 250cm3 determine the molarity of the solution​

The moles of substance present is 0.1 mol and molarity of the solution is 0.4 M.

Explanation:

Given: Mass = 4 g

Volume = 250 (1 = 0.001 L) = 0.250 L

Moles is the mass of a substance divided by its molar mass.

So, moles of NaOH (molar mass = 40 g/mol) is calculated as follows.

Molarity is the number of moles of a substance present in liter of a solution.

Hence, molarity of given NaOH solution is as follows.

Thus, we can conclude that moles of substance present is 0.1 mol and molarity of the solution is 0.4 M.

c. is the answer

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