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Parts per billion (ppb) is a unit of concentration, while microliter (μL) is a unit of volume. To convert ppb to microliters, you need to know the density of the substance in question. The formula for this conversion is: microliters = (ppb * volume in liters) / density in g/mL. This formula takes into account the concentration of the substance in ppb and its density to give you the volume in microliters.
5 millimolar
Millimole is expressed as "mmol". Millimolar is exressed as "mM".
A billion.
100,000 micro liters.