Question

What is the molarity for 0.345 moles of KCI in a 345 mL solution?

Answer 1

Step 1

Molarity is defined as follows:

`Molarity\text{ \lparen M or mol/L\rparen = }\frac{moles\text{ of solute \lparen KCl\rparen}}{Volume\text{ of the solution \lparen L\rparen}}`

L means litters.

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Step 2

Information provided:

0.345 moles KCl

345 mL of solution x (1 L/1000 mL) = 0.345 L

(1 L = 1000 mL)

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Step 3

Then, molarity: from step 1

Molarity = 0.345 moles/0.345 L = 1 M or 1 mol/L

Answer: Molarity = 1 M