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How to Convert Micrograms to Micromoles

A mole is a basic unit of measurement in chemistry. One mole of any substance equals 6.02214 * 10^23 particles of that substance. A mole also equals the atomic weight or molar mass of a substance, expressed in grams. A micromole is one mole divided by 1,000,000, which can also be expressed as 1 * 10^-6. Converting from micrograms to micromoles involves using the molar mass of each element in a compound. Molar mass can be found on the periodic table at the bottom of each elemental box.

Instructions

- 1
  Convert 2.5 x 10^-5 micrograms of KMnO4 to micromoles. Divide the micrograms by 1 x 10^-6 to put it into gram form: (2.5 * 10^-5) / (1 * 10^-6) = 25.0 grams KMnO4.
- 2
  Calculate the molar mass of the compound by finding the molecular weight of each element on the periodic table and adding them together: 39.0983 + 54.938045 + (4 * 15.9994) = 158.034 grams/mole (rounded.) Note that the weight for oxygen is multiplied because of its subscript in the chemical formula.
- 3
  Find the moles by dividing the grams of the compound by the molar mass: 25.0 grams / (158.034 grams/mole) = 0.158 moles KMnO4 (rounded.)
- 4
  Multiply the number of moles by 1 * 10^-6 to calculate the micromoles: 0.158 * (1 * 10^-6) = 1.58 * 10^-7 micromoles KMnO4.

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