The mass of the substance with a volume of 20 mL and a density of 2.5 g/mL would be 50 g.
From the the formula for density:
Density = mass/volume
Make mass the subject:
mass = volume x density.
In this case, volume = 20, density = 2.5
Hence,
mass = 20 x 2.5
= 50 g
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