How to convert from micro mole per mole to parts per million?

Divide by 1 million. Example: 2.35 moles/liter = 2.35 × 10-6 moles per microliter

first you must have a mass in mind. eg 345 grams of Carbon divided the mass by the molar weight of the particular substance. In the case of Carbon 12 grams/mole 345 grams/12 grams/mole = 28.75 moles

to convert millimoles into micromoles just multipy you're answer by 1000.

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-- take the number of parts per thousand -- multiply it by 1,000 -- the answer is the number of parts per million