Can you please show your work too.

1. How many milligrams (mg) of NaCl are in 250 mL of 1/4 NS? Provide answer to the nearest whole number. (Note NS = 0.9% w/v = 0.9 g per 100mL)

2. A patients blood contains 0.063 PPM of selenium. How many micrograms of selenium is contained in 2.5 L of the patients blood?

3. If one gallon of a 10% (w/v) solution is evaporated to a solution with a 25% (w/v) strength, what will be the new volume (in mL)? Round to the nearest 100 mL. Use 1 gallon = 3,785 mL

4. If a pharmacist adds 4.5 grams of Drug A to 150 grams of 5% Drug A cream. What is the percentage (w/w) of Drug A in the final product? Round to the nearest whole number.

5. A 10-mL vial contains 25 mg of diltiazem hydrochloride and a bolus dose of 0.2 mg/kg is needed for a 110-kg patient. How many mL should be administered to the patient to provide the required bolus dose of diltiazem? Round answer to the nearest tenths place value.