How many moles of KCl are contained in each solution? b. 1.8 L of a 0.85 M KCl solution

검증된 단계별 안내

Identify the formula for molarity: \( M = \frac{n}{V} \), where \( M \) is molarity, \( n \) is the number of moles, and \( V \) is the volume in liters.

Rearrange the formula to solve for the number of moles: \( n = M \times V \).

Substitute the given values into the equation: \( n = 0.85 \, \text{M} \times 1.8 \, \text{L} \).

Perform the multiplication to find the number of moles of KCl.

Ensure the units are consistent and the calculation is correct.

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주요 개념

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Molarity

Molarity (M) is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in moles per liter (mol/L) and is crucial for calculating the amount of solute in a given volume of solution. Understanding molarity allows one to determine how many moles of a substance are present in a specific volume, which is essential for stoichiometric calculations in chemistry.

Moles

A mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole contains approximately 6.022 x 10²³ entities, such as atoms or molecules, known as Avogadro's number. Moles provide a bridge between the atomic scale and macroscopic quantities, allowing chemists to relate mass, volume, and concentration in chemical reactions and solutions.

Volume and Concentration Relationship

The relationship between volume and concentration is critical in determining the amount of solute in a solution. The formula used is: moles of solute = molarity (M) × volume (L). This relationship allows for the calculation of moles when the molarity and volume of a solution are known, facilitating various applications in laboratory settings and chemical reactions.