1.3 per cent by mass per volume is the mass of the solute in the solution of the existing 100 volume units (units of mass and volume must be consistent, such as grams per cubic centimeter (g/cm3), cubic metres, kilograms per de Carlo (kg/dm3), such as slurry screw co sakhem concentrate, 20 percent by mass per volume) means in 100 cm3 with a fastener co taking pattern is 20 grams or 100 dm3 slurry with co screw taking the polka is 20 kg, this method is increasingly used as a slurry, solids in the liquid.2. mole per cubic desimet (mol/l), or moles per liter. (Mol/dm3) this unit often used abbreviation as "M" (derived from the Molar). This tells how many moles are in aqueous NaOH solution, such as 0.1 Mol/dm3 concentration (0.1 M).Meaning that aqueous NaOH in 1 NaOH 0.1 mol dm3 are dissolved.3. the mole per kg or Lae (mol/kg or molal) this unit often used abbreviation "M" is a unit of concentration to 1 kg in solute, there are a few moles solute such as urea in water, thickeners, 1 mol/kg or concentration of 1 mol/kg or 1 m means that 1 mol urea dissolves in water, 1 kg.
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