What is the volume of a sample that has a mass of 20 g and a density of 2 g/mL?

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10 mL

You would use the equation volume=mass/density. So since your mass is 20 g it goes on the top and your density is 2 g/mL so it goes on the bottom. So you have volume=20g divided by 2 g/mL. You then solve it so your grams cancel out and you have mL left then you go 20 divided by 2 and that equals 10. So your answer is 10 mL.