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## Homework Statement

Calculate the true mass (in vacuum) of a piece of aluminum whose apparent mass is 4.2000 kg when weighed in air. (Express your answer as 4.2000 kg plus a positive or negative number.)

(4.2000 + ________ ) kg

## Homework Equations

Buoyant force = density x gravity x volume

d=m/v

## The Attempt at a Solution

I'm guessing I have to find the amount of air displaced but I'm really not too sure on how to go about doing this