Question

Calculate the molarity of a solution prepared by dissolving 1.00 g of ethanol, C2H5OH, in enough water to give a final volume of 101 mL

Answer 1

Molar mass C2H5OH = 46.06 g/mol

Number of moles:

1.00 / 46.06 => 0.0217 moles

Volume = 101 mL / 1000 => 0.101 L

Therefore:

Molarity = moles / volume

Molarity = 0.0217 / 0.101

=> 0.214 M