Conversion Chart for Concentrations of O2 TO Æ FROM mg O2 L moles O2 L equiv O2 L mg O2 L 1 mol 32 000 mg 1 equiv 8000 mg moles O2 L 32 000 mg mol 4 equiv mol equiv O2 L 8000 mg equiv 1 mol 4 equiv Construct a similar conversion table for CaCO3 Other conversion charts can be prepared that include converting to mg L NO3 N mg L NO 3