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Sagot :
Answer:
0.012 M
Explanation:
Step 1: Given and required data
- Mass of KCl (m): 0.64 g
- Volume of water (V): 725 mL (We will assume it is equal to the volume of the solution)
- Molar mass of KCl (M): 74.553 g/mol
Step 2: Calculate the moles (n) of solute (KCl)
We will use the following expression.
n = m/M = 0.64 g / (74.553 g/mol) = 8.6 × 10⁻³ mol
Step 3: Calculate the molar concentration (C) of the solution
The molarity is equal to the moles of solute divided by the liters of solution.
C = 8.6 × 10⁻³ mol/0.725 L = 0.012 M
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