Math/ chemistry homework help?

Question

Having trouble with a few questions, I'm not sure of the questions......

You made a 120 mL solution containing 1.0 g of NACl. (MW= 58.5 g/mole)

A. Whats the concentration of this solution in g/L?

B. What is the osmolarity of this solution (osmoles/L)?

C. What % solution did you make?

I was thinking that the % solution was 12 and the concentration was also 12, but I'm not sure if that is right.

2. A patient is prescribed 2.0 g of amoxicillin every 8 hours. The amoxicillin oral suspension liquid is labeled 250 mg/ 5 mL.

A. How many ml should be administered at each dose?

B. How many mg of amoxicillin are in each dose?

C. How many ug?

3. A patient is prescribed 40 mg of Codeine elixir. The bottle is labeled 10 mg/5 mL.

A. What is the molarity of this solution? 
(MW codeine monohydrate = 317.4 g/ mol)

B. How many mL do you need to give the patient?

4. You are required to give a patient 1.4 g of Equantil to treat anxiety, but the drug is only available in 200 mg tablets.

A. How many mg in total are you giving the patient?

B. How many tablets would you give the patient?

Please help. Thank you so much if you can explain everything and show me thoroughly how to do it. I have an exam soon.

Mercy · Answer

A/

Molarity describes the concentration of a solution in moles of solute divided by liters of solution. Masses of solute must first be converted to moles using the molar mass of the solute

example:

https://answers.yahoo.com/question/index?qid=20120124232654AAgKSwY

B/

Osmolarity is defined as the number of osmoles of solute per liter (L) of solution. It is expressed in terms of osmol/L or Osm/L. 
A 1 mol/L NaCl solution has an osmolarity of 2 osmol/L. A mole of NaCl dissociates fully in water to yield two moles of particles: Na+ ions and Cl- ions. Each mole of NaCl becomes two osmoles in solution.

Math/ chemistry homework help?

1 Answer