Question: You need to give 1 g of magnesium sulfate How many mls do you need of the solution shown in Fig 1?

Answer: The vial contains 20 ml of 10% magnesium sulfate.

10% = 100 mg/ml = 1g/10 ml, or, 8 meq = 4 mmol which is approximately 1 g.

You need 10 ml of this solution.