The molecular weight of methotrexate a pharmaceutical drug, Ask an Expert

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The molecular weight of methotrexate, a pharmaceutical drug, is454.45. It is supplied in 1 mg per vial. You want to treat your culture cells with a final concentration of 1 nanoM methotrexateand will need 20 ml of cells for your experiment. You want to add10 microM of solution. What concetration does your stock solution need to be?

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