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Millis (Equivalents and Moles)

Millis (Equivalents and Moles). Basics. 1 mole of anything = atomic, formula, or molecular weight in grams 1 mole of Na + (atomic weight 23) = 23 grams 1 mole of CaCl 2 (Ca=40, Cl=35.5 X 2) = 111 grams 1 milliequivalent (mEq)= 1/1000 Eq 1 millimole (mmol) = 1/1000 mol

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Millis (Equivalents and Moles)

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  1. Millis(Equivalents and Moles)

  2. Basics • 1 mole of anything = atomic, formula, or molecular weight in grams • 1 mole of Na+ (atomic weight 23) = 23 grams • 1 mole of CaCl2 (Ca=40, Cl=35.5 X 2) = 111 grams • 1 milliequivalent (mEq)= 1/1000 Eq • 1 millimole (mmol) = 1/1000 mol • 1 mEq = 1 mmol/valence

  3. Basics • Equivalent (Eq) weight = molecular weight/valence • Equivalents = # moles X valence • Valence = charge • K+, Na+, PO4-, or Cl- = 1 • Ca2+ = 2 • Eq weight of Na+ =23/1 = 23 grams • 1 Eq of Na+ = 1 mole of Na+ • Eq weight of Ca2+ = 40/2 = 20 grams • 2 Eq of Ca2+ = 1 mole of Ca2+

  4. Example • How many mEq are in 117 mg of NaCl Cl = 35.5, Na = 23 = 2 mEq of Na+, 2 mEq of Cl-, 2 mEq of NaCl.

  5. Example • How many mEq of potassium are in 1500 mg of KCl? K+ = 39.1 g, Cl- = 35.5 g

  6. Same problem different way to calculate We have 1500 mg KCl FW = 74.6 g

  7. How many mEq of NaCl needs to be added to 250 mL of water to make half normal saline?

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