What is the molarity of a solution prepared by dissolving 10.19 g of ethanol (CH₃CH₂OH) in enough water to produce 250.0 mL of solution? (LO 4.1) (a) 0.8848 M (b) 18.08 M (c) 1.130 M (d) 0.01808 M

Key Concepts

Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in moles per liter (M). To calculate molarity, one must know the amount of solute in grams, convert it to moles using the molar mass, and then divide by the volume of the solution in liters.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). For ethanol (C2H5OH), the molar mass can be calculated by summing the atomic masses of its constituent elements: carbon, hydrogen, and oxygen. This value is essential for converting grams of a substance to moles.

Volume Conversion

Volume conversion is the process of converting units of volume to ensure consistency in calculations. In this context, the volume of the solution is given in milliliters (mL) and must be converted to liters (L) for the molarity calculation, as molarity is defined in terms of liters of solution.