There can be no equivalence.
A gram is a measure of mass. A millilitre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a millilitre of air. How many grams? Next consider a millilitre of water. How many grams? The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
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This is not a valid conversion. Milliliters (mL or ml) and liters (L) are measures of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass.
12 cmcubed equals to how many ml
That cannot be determined, for grams is a unit of weight and mL is a unit of volume.
To determine how many 400 mcg tablets equal 1 ml, you need to know the concentration of the substance in mg/ml. If we assume that 400 mcg is equivalent to 0.4 mg, then if the concentration is 1 mg/ml, it would take 2 tablets (0.4 mg x 2 = 0.8 mg) to equal 1 ml. However, without specific concentration information, we cannot provide an exact answer. Please check the product's labeling for accurate dosing.
1 kL = 1,000,000 mL