A relative density bottle has a mass of 19 g when empty. ...
A relative density bottle has a mass of 19 g when empty. When it is completely filled with water, its mass is 66 g. What will be its mass if completely filled with alcohol of relative density 0.8?
47 g
52.8 g
37.6 g
56.6 g
Correct answer is D
Let mb=mass of empty bottle,
mw=mass of water only and
ma= mass of alcohol only
given; mb=19g
mb + mw = 66g
mb + ma = ?
R.d=0.8
R.d=mass of alcohol
⇒massofalcoholmassofequalvolumeofwater
⇒ mass of equal volume of water = mw=66-19=47g
⇒0.8 = ma47
⇒ma=0.8×47 =37.6g
; mb + ma = 19+37.6=56.6g
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