Calculate the concentration of magnesium chloride (MgCl2) in mol L-1 if you have a 4% w/v solution. Molar mass of MgCl2 = 95.21 g mol-1.Question 13Answer0.420 mol L-10.168 mol L-10.120 mol L-10.00420 mol L-10.0105 mol L-1
Question
Calculate the concentration of magnesium chloride (MgCl2) in mol L-1 if you have a 4% w/v solution. Molar mass of MgCl2 = 95.21 g mol-1.Question 13Answer0.420 mol L-10.168 mol L-10.120 mol L-10.00420 mol L-10.0105 mol L-1
Solution
To calculate the concentration of magnesium chloride (MgCl2) in mol L-1, follow these steps:
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Understand that a 4% w/v solution means that there are 4g of MgCl2 in 100mL of solution.
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Convert the volume of the solution from mL to L: 100mL = 0.1L.
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Calculate the number of moles of MgCl2 in the solution using the molar mass. The number of moles = mass (g) / molar mass (g/mol). So, the number of moles = 4g / 95.21g/mol = 0.042 mol.
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Finally, calculate the concentration of the solution in mol/L. Concentration = moles / volume (L). So, the concentration = 0.042 mol / 0.1L = 0.420 mol L-1.
So, the correct answer is 0.420 mol L-1.
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