To convert milliequivalents (mEq) of sodium to milligrams (mg) of sodium, you need to multiply the mEq value by the atomic weight of sodium and then divide by the valence. The atomic weight of sodium is approximately 22.99 mg/mEq, and the valence of sodium is 1.

So, the formula for converting mEq sodium to mg sodium is:

mg sodium = mEq sodium x 22.99 mg/mEq / 1

For example, if you have 1 mEq of sodium, you can calculate the equivalent amount in milligrams as follows:

mg sodium = 1 mEq x 22.99 mg/mEq / 1

= 22.99 mg

Therefore, 1 mEq of sodium is equivalent to 22.99 mg of sodium.