Lucas V. answered • 04/25/19

Pre-Med./Nursing | 92-%tile MCAT | Accepted to MD program

This question involves stoichiometric conversions and the following equations will be useful:

Equivalents (Eq) = mass_{solute/compound} (g) ⁄ Gram-equivalent weight (g)

Gram-equivalent weight = Molar mass ⁄ *n*

You need to define the #-*n *for your solute — Ca++. Consider the valence/oxidation state for this cation.

Remember that the molar mass for Ca++ is ≈ 40.01 g•mol.¯^{1 }

A simplified expression:

mEq = (mg_{solute/compound} • valence_{#-n}) ⁄ atomic weight (μ)

Remember that the atomic weight of calcium is ≈ 40.01 μ

Review the concepts of equivalence and gram-equivalent weight to better understand how to designate the value of *n* in your problem. If further help is needed to clarify on these concepts or the mathematical calculation, let me know - but try to solve the problem again with these points in mind. :)