Question

2) Milan is measuring the density of ethanol. He weighs a bottle three times first empty, then filled with
water; then filled with ethanol. Here are his results:
mass of empty bottle = 30.0g mass of bottle filled with water = 90.0g
mass of bottle filled with ethanol = 78.0g
a) Calculate the volume of the bottle.
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Answer 1

Explanation:

Mass of empty density bottle = 30 gm

mass of density bottle with water in it  62 gm

Mass if density bottle with the liquid = 54 gm

Mass of water only = 62-30=32 gm

(a) Now volume of 1 g of water = 1cm3

∴ Volume of density bottle = 32 cm3

(b) Mass of liquid only = 54-30=24 gm

∴ density of the liquid = ∴VolumeofliquidMassofliquidonly

=32cm324g=0.75g/cm3