The mass of CoCl₂ is 6.515 g.
Given,
Molarity of the solute (CoCl₂) = 0.674 M
Volume of solution = 0.0750 L
Molecular weight of solute (CoCl₂) = 128.9 g/mol
Molarity formula is used to solve this question.
Molarity is defined as the number of moles of solute per liter of solution.
[tex]Molarity = \frac{number of moles }{volume (in L)}[/tex] .......(i)
We know that,
[tex]number of moles = \frac{weight of given solute }{molecular mass if the solute}[/tex] ........(ii)
Put the above values in equation (i)
[tex]0.674 = \frac{number of moles}{0.0750}[/tex]
[tex]number of moles = 0.674 (0.0750)[/tex]
[tex]number of moles = 0.05055[/tex]
Put the number of moles in equation (ii)
[tex]0.05055 = \frac{weight of given solute}{128.9}[/tex]
[tex]weight of given solute = 0.05055 (128.9)[/tex]
[tex]weight of given solute = 6.515 g[/tex]
Therefore, 6.515 g of CoCl₂ is needed.
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