Step 1
Molarity is defined as:
Molarity (M or mol/L) = number of moles of solute (NiCl2)/volume of the solution (L) (1)
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Step 2
Information provided:
0.125 M NiCl2
3.25 g NiCl2
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Information needed:
The molar mass of NiCl2 = 130 g/mol approx. (please, use your periodic table to calculate this)
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Step 3
Procedure:
Number of moles = mass/molar mass = 3.25 g/130 g/mol = 0.025 moles
According to equation (1) in step 1:
Molarity = number of moles/volume (L)
Volume (L) = number of moles/molarity
Volume (L) = 0.025 moles/0.125 mol/L = 0.2 L or 200 mL
(1 L = 1000 mL)
Answer: volume of solution = 0.2 L or 200 mL