Question

How many moles of NaCl are required to make 2.85L of a 0.10M solution?Use the correct abbreviation for the UNITS and watch the SigFigs

Answer 1

Step 1

Molarity is defined as follows:

$Molarity\text{ \lparen mol/L or M\rparen= }\frac{Number\text{ of moles}}{Volume\text{ of solution \lparen L\rparen}}=\text{ }\frac{n}{V(L)}$

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Step 2

Data provided:

V(L) = 2.85 L (solution)

Molarity = 0.10 M or mol/L

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Step 3

Procedure:

Molarity = n/V(L)

Molarity x V(L) = n

0.10 mol/L x 2.85 L = n

0.29 moles = n

Answer: 0.29 moles of NaCl