Synthesis

How do you calculate reaction equivalents to mass?

Pin the scale, get every reagent’s mmol, mass, and volume from its equivalents. The relationship used is mmol = equiv · scale ; mass = mmol · MW.

Worked example

Every number below is computed by the calculator, not typed in

What you are given

  • Scale: mmol at 1.0 equiv: 5
  • Reagents: [{"name":"Benzoic acid","equiv":"1.0","mw":"122.12","density":""},{"name":"Ethanol","equiv":"1.2","mw":"46.07","density":"0.789"}]

Formula: mmol = equiv · scale ; mass = mmol · MW

The working

  1. Scale: 1.0 equiv = 5 mmol
  2. Per reagent: mmol = equiv · scale; mass = mmol · MW; volume = mass / density

At 5 mmol, weigh 610.6 mg of Benzoic acid.

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