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How many milliliters of a 1.75MLiCl solution contain 15.2 g of LiCl?

Short Answer

Expert verified
204.9 mL

Step by step solution

01

- Determine the Molar Mass of LiCl

Calculate the molar mass of LiCl. Li has a molar mass of approximately 6.94 g/mol and Cl is about 35.45 g/mol. Thus, the molar mass of LiCl is 6.94 g/mol+35.45 g/mol=42.39 g/mol.
02

- Convert Grams to Moles

Use the molar mass to convert from grams to moles. Given 15.2 g of LiCl: Moles of LiCl=15.2 g42.39 g/mol0.3585 moles
03

- Use the Molarity Formula

Given the molarity 1.75 M, the formula to find volume V is: M=moles of solutevolume of solution in liters. Rearrange this to find the volume: V=moles of soluteM.
04

- Calculate the Volume in Liters

Substitute the values into the rearranged formula: V=0.3585 moles1.75 M0.2049 liters
05

- Convert Liters to Milliliters

Convert the volume from liters to milliliters by multiplying by 1000: 0.2049 liters×1000=204.9 mL

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Molarity
Molarity is a measure of the concentration of a solution. It tells us how many moles of solute are present per liter of solution. The formula for molarity (M) is: M = moles of solutevolume of solution in liters.
To compute molarity:
  • Identify the moles of solute.
  • Measure the volume of the solution in liters.

For example, if you know there are 0.5 moles of NaCl in 1 liter of solution, the molarity is 0.5 M. Molarity is crucial for preparing solutions of precise concentration, which is often needed in chemical reactions and laboratory experiments. Molarity helps standardize how we describe concentrations no matter the amount of solution we have.
Molar Mass
Molar mass is the mass of one mole of a substance (usually in grams). It’s used to convert between grams and moles. You can find the molar mass by summing the atomic masses of all atoms in a molecule.
For Lithium Chloride (LiCl), we do the following:
  • Find the atomic mass of Li (approximately 6.94 g/mol)
  • Find the atomic mass of Cl (approximately 35.45 g/mol)
  • Add these together: 6.94 g/mol + 35.45 g/mol = 42.39 g/mol

This means that one mole of LiCl weighs 42.39 grams. Molar mass is important in converting between mass and moles, which is necessary for stoichiometric calculations in chemical reactions.
Conversion of Units
Often, we need to convert units to ensure that our values are correctly matched in calculations. Common conversions include:
  • Grams to moles: Use the molar mass (e.g., 15.2 g LiCl42.39 g/mol0.3585 moles).
  • Liters to milliliters: Multiply by 1000 (e.g., 0.2049 liters ×1000=204.9 mL).
  • Moles to number of particles: Use Avogadro's number (6.022×10²³ particles/mol).

Conversions ensure that consistent units are used throughout calculations, preventing errors and allowing different measurements to be combined.
Chemical Calculations
Chemical calculations involve using relationships between quantities like mass, volume, molarity, and moles. The steps to solve such problems are typically:
  • Find the molar mass of the compounds involved.
  • Convert the given quantities to the needed units, such as grams to moles.
  • Apply the molarity formula: M=molesliters.
  • Rearrange formulas when necessary to find unknown values.

For instance, to find the volume of a LiCl solution containing 15.2 grams of LiCl at 1.75 M, follow these steps:
  • Calculate moles: 15.2 g42.39 g/mol0.3585 moles
  • Use the molarity formula: V=moles of soluteM
  • Substitute: V=0.3585 moles1.75 M0.2049 liters
  • Convert to mL: 0.2049 liters ×1000=204.9 mL

Accurate chemical calculations are essential in chemistry to predict the outcomes of reactions and prepare solutions.

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