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density = mass/volume

density = 15/20 = 3/4 units/ml

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Q: What is the density of a unknown substance with a mass of 15 and a volume of exactly 20 mL?
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Related questions

What substance can be calculated by dividing its mass by its volume?

It's not exactly a "substance" but Density = Mass / Volume


What is the procedure to calculate the density of an unknown substance?

divide mass and volume(:


How do you determine the identity of an unknown substance by observing its mass and volume?

All you can do with mass and volume is to determine the density of the substance. density = mass / volume or p=m/v after you determine the density, you can look on any density table and find the substance you are looking for. good look. -julio


What procedures would you follow if you wanted to calculate the density of an unknown substance?

Weigh it & measure its volume.


How do you calculate the density of a substance?

Density is the mass of a substance divided by the volume of that same mass of substance.


What is the density of a 26.5mL sample of an unknown substance that has a mass of 43.54g?

density = mass/volume = 43.54g / 26.5ml ≈ 1.643 g/ml


What is the density of an unknown substance with a mass of 16.5 g and a volume of 2.2 cm3?

Density = Mass/Volume = 16.5 g / 2.2 cm3 = 7.5 g/cm3


When you divide the mass of a substance by its volume you get its what?

When we divide the mass of a substance by its volume we get its density.


Why is it not necessary to know the volume of a substance when calculating its density?

If you want to CALCULATE the density of an unknown substance, you need to divide its mass by its volume, so you need to measure both first. If it is a homogeneous (uniform) substance, and you can take away a piece, you can take any sample. Any piece of the substance will have the same density.


How can you change density of a substance?

You can change the density of a substance by changing its volume. Density is equivalent to mass over volume. So changing the volume affects density.


How much mass there is in a volume of a substance?

If the density of the substance is known, then you can calculate it. Density = Mass/Volume, so Mass = Density x Volume


Is the density of a substance obtained by dividing its volume with its weight?

The density is measured by dividing the mass of the substance with it's volume. Density = Mass/Volume.