There is 500 mg of potassium in 1 cup (240 ml) of orange juice. Your renal patient must watch his potassium intake not to exceed 2 mg per kg of body weight per day from Orange juice alone. How much juice (in ml) can this patient have per day if the patient weighs 135 lb?

58.79 mL of juice

Step-by-step explanation:

To do this, let's gather the data first:

In 1 cup of orange juice we have 500 mg of potassium. A patient weights 135 lb, and he needs to take care of it's potassium intake and not exceed 2 mg of K / kg per day.

So obviously he cannot drink a whole cup of orange juice. It has to be less. In order to know this, we need to know first the weight in kg. 1 lb equals 0.4536 kg so in 135 lb:

W = 135 lb * 0.4536 kg/lb = 61.24 kg

Now, we need to know with this weight, how much potassium it can takes:

Intake = 61.24 kg * 2 mg/kg = 122.48 mg of K

So, the maximum amount of potassium per day is 122.48 mg. This means that the quantity of orange juice this person can take is:

Juice = 122.48 mg * 240 mL / 500 mg

Juice = 58.79 mL of juice or simply 59 mL