An intravenous solution contains 2.5 mEq/L of magnesium ions. How many moles of magnesium are in 750 mL of this solution?

.9375 x 10⁻³ moles .

Explanation:

2.5 mEq / L of Magnesium ion

2.5 x 10⁻³ Eq / L

= 2.5 x 10⁻³ / 2 mole / L    [  1 mole = 2 Eq ]

= 1.25 x 10⁻³ mole / L

1 L contains 1.25 x 10⁻³ mole

750 mL = .75 x 1.25 x 10⁻³ mole

= .9375 x 10⁻³ mole .

So 750 mL contains .9375 x 10⁻³ moles .

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