If 102.6 g of K2SO3 are dissolved into 3.1 L of solution calculate the molar concentration PLEASE! help and and show the steps !! I’m trying to understand the process!
What's the definition of molarity?
Molarity = M = number moles/L solution.
How many mols do you have? mols K2SO3 = grams/molar mass = ?
How many L solution do you have? L = 3.1
M = mols/L = substitute the above and solve.
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To calculate the molar concentration (also known as molarity), you need to find the number of moles of the solute (K2SO3) and divide it by the volume of the solution (in liters). Here's how you can do it step-by-step:
Step 1: Find the molar mass of K2SO3
To find the molar mass of K2SO3, you need to add up the atomic masses of all the atoms in the compound.
Molar mass of K2SO3 = (2 x atomic mass of K) + atomic mass of S + (3 x atomic mass of O)
= (2 x 39.10 g/mol) + 32.07 g/mol + (3 x 16.00 g/mol)
= 78.20 g/mol + 32.07 g/mol + 48.00 g/mol
= 158.27 g/mol
Step 2: Convert the mass of K2SO3 to moles
To convert mass to moles, you need to divide the mass of the compound by its molar mass.
Number of moles of K2SO3 = mass of K2SO3 / molar mass of K2SO3
= 102.6 g / 158.27 g/mol
= 0.648 moles
Step 3: Calculate the molar concentration (molarity)
The molar concentration is calculated by dividing the number of moles of solute by the volume of the solution.
Molar concentration = moles of solute / volume of solution
Given: Volume of solution (V) = 3.1 L
Molar concentration = 0.648 moles / 3.1 L
= 0.209 molar (rounded to three decimal places)
Therefore, the molar concentration of the solution is 0.209 mol/L.
Note: Always make sure to use consistent units for calculations. In this case, the mass was in grams and the volume was in liters, so we converted the mass to moles and the volume to liters before calculating the molar concentration.