Please calculate the correct dose to be administered using a medication order by the physician, medication, and medicine

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Please calculate the correct dose to be administered using a medication order by the physician, medication, and medicine note
1) Medication 1: The order reads: Ampicillin 0.5g two times a day for 7 days. Available is 1000 mg per ml ampules, how much volume would be needed to fill this prescription.
2) Medication 2: The physician orders aspirin 10 g Q4h PRN for fever over 101. On hand are aspirin gr 5 tabs
3) Medication 3: The narcotic drawer contains vials of meperidine (Demerol) labeled 75 mgin 1ml. The preoperative order reads Demeral 60 mg 1 m
4) Medication 4: The physician orders Versed 3 mg IM preoperatively. On hand are vials labeled 5 mg per ml
5) Medication 5: The order reads atropine sulfate 0.6 mg IM on call to surgery. Available ampules are labeled atropine sulfate 0.4 mg/ml
case study: Please answer all of the following questions, using well-written, complete sentences.
Lana chambers weighs 28 pounds. Her pediatrician orders erythromycin 50 mg/kg/da po TID
Calculate Lana’s weight in KG
Calculate the dose of erythromycin Lana needs.
How much Lana receive at each dosing?
If the erythromycin is available as erythromycin 400 mg per 5 mL, calculate the dose to be given TID