Explain what is the molecular weight of the hormone

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Arginine vasopressin is a pituitary hormone. It assists regulate the amount of water in the blood by reducing the flow of urine from the kidneys. An aqueous solution containing 21.6 mg of vasopressin in100.0mL of solution has an osmotic pressure at 25°C of 3.70mmHg. Explain what is the molecular weight of the hormone?

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