If 15.55 g of NaOH (Molar mass 40 g/mol) are dissolved in 500.0 mL of water solution, what is the molarity? M = mol/L A) 1.286 M B) 0.81 M C) .1286 M D) 0.7775 M

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Answer D) 0.7775

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Asked 3/8/2011 3:48:45 PM

Updated 7/5/2023 12:11:13 AM

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KuyaBert_09

Mass of NaOH = 15.55 g
Molar mass of NaOH = 40 g/mol
Volume of solution = 500.0 mL = 0.5 L
moles = mass / molar mass
moles = 15.55 g / 40 g/mol
moles = 0.38875 mol

Next, calculate the molarity:
Molarity (M) = moles / volume (in L)
Molarity (M) = 0.38875 mol / 0.5 L
Molarity (M) = 0.7775 M

Therefore, the molarity of the NaOH solution is 0.7775 M.

Added 7/5/2023 12:11:13 AM

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