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How do I go about making a solution for lab that is supposed to be "2 mmol of MgSO4 in 40 mL of DMF." The formula weight...

How do I go about making a solution for lab that is supposed to be "2 mmol of MgSO4 in 40 mL of DMF." The formula weight of Magnesium Sulfate is 120.366g. Would the stoich be (120.366g/1mol)*(0.002mol/1L)*(1L/1000mL)*(40mL) = 0.009629g which would result in me putting 0.009629g of MgSO4 in the vial and then adding the 40mL of DMF to it?

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Answer #1

Molar mass of MgSO4 is 120.366 g/mol

1 mol is equivalent to 120.366 g

Thus 1 mmol is equivalent to 120.366/1000 = 0.120366 g

Thus 2 mmol is equivalent to 2*0.120366 = 0.240732 g

Thus to make a solution " 2 mmol of MgSO4 in 40 mL of DMF" we need to add 0.240732 g MgSO4 should be taken in a vial and then add 40 mL of DMF.

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