Express 0.4 uM to mmol/mL

0.4 * 10⁻⁶mol

Explanation:

The unit conversion required are,

1 μ M = 10⁻⁶ M

1 L = 1000 mL

1 mol = 1000 mmol

molarity of a solution is given as -

Molarity (M) = (w / m) / V (in L)

where,

m = molecular mass,

w = given mass,

V = volume of solution,

Hence, the unit is,

M = mol / L

from the question,

0.4 μ M = 0.4 * 10⁻⁶ M

Now,

0.4 * 10⁻⁶ M = 0.4 * 10⁻⁶ mol / L

Since,

1 L = 1000 mL

and,

1 mol = 1000 mmol

0.4 * 10⁻⁶ mol / L = 0.4 * 10⁻⁶ * 1000 mol / 1000 mL = 0.4 * 10⁻⁶mol