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Experiments with rats show that if rats are dosed with 3.0 mg/kg of cocaine (that is, 3.0 mg cocaine per kg of animal mass), the concentration of dopamine in their brains increases by 0.75 uM after 60 seconds. Calculate how many molecules of dopamine would be produced in a rat (average brain volume 5.00 mm^3) after 60 seconds of a 3.0 mg/kg dose of cocaine?