Blood serum in healthy adults normally contains approximately 3.2 mg/ml of sodium ions (na+) and approximately 3.5 mg/ml of chloride ions (cl−).
how many milliliters of blood serum would be needed to obtain 3.1 g of na+?
how many milliliters of blood serum would be needed to obtain 3.1

968.75 mL of blood serum are needed to obtain 3.1 g of Na⁺

885.71 mL of blood serum are needed to obtain 3.1 g of Cl⁻

Explanation:

Knowing that the blood serum contains 3.2 mg/mL of sodium ions (Na⁺) we devise the following reasoning:

if          3.2 mg of sodium ions are found in 1 mL of blood serum

then    3100 mg of sodium ions are found in X mL of blood serum

X = (1 × 3100) / 3.2 = 968.75 mL

Knowing that the blood serum contains 3.5 mg/mL of chlorine ions (Cl⁻) we devise the following reasoning:

if          3.5 mg of chlorine ions are found in 1 mL of blood serum

then    3100 mg of chlorine ions are found in X mL of blood serum

X = (1 × 3100) / 3.5 = 885.71 mL