Answer:
It means the substance has 45 grams per liter.
Step-by-step explanation:
This and other abbreviations are used for units of measurements, to make things more simple.
Hope it helped!
A solution with a concentration of 45 g/L means that there are 45 grams of solute (the substance that is dissolved) in each liter of the solution. This is a measure of how much of a substance is dissolved in a given volume of the solution. It is also sometimes referred to as the "molarity" of the solution.
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