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# Finding mass with density?

Update:

There is 21.1g of PLA. Density of PLA is 1.25g/mL. I need to find the volume of PLA to determine the mass it will weigh in aluminum. Density of aluminum is 27.g/mL. Thanks!

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- Steve4PhysicsLv 71 month ago
Your value for density of aluminium is wrong, it is 2.70g/mL, not 27g/mL.

There are 21.1g of PLA, density = 1.25g/mL.

Volume = mass/density = 21.1g/(1.25g/mL) = 16.88mL

What is the mass of this volume of aluminium, density 2.70g/mL?

Mass = volume x density = 16.88mL x 2.70g/mL = 45.6g (rounded to 3 sig figs.)

________________

The3 key formulae are:

Density = mass/volume

Volume = mass/density

Mass = volume x density

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