3 mEq / litre
volume = 380 ml or 0.380 litre
mEq = 3*0.380
= 1.14mEq
or 1.14*10^-3 Eq
now,
for Mg2+ = 24 / 2
= 12 g
mass = 1.14*10^-3 * 12
= 0.01368 g
= 13.68 mg
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