how many molecule are in 4 microliter of a solution of NaCl with molarity 6 mM?

Question

Question

Answer 1

Answer #1

140.256 ug of NaCl is in 4 ul of 6 mM solution.

Molecular weight of NaCl is 58.44 g/mol.

Concentration of the solution is 6 mM.

Volume of the solution is 4 ul.

Mass = Concentration (mol/L) x Volume (L) x Molecular weight (g/mol)

= 6 x 10-3 M (6 mM) x 4 x 10-4 L (4 ul) x 58.44 g/mol

= 1402.56 x 10-7 g

= 140.256 ug (0.140256 mg).

Answer 2

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