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Three litres of water 1g/cm^3 is added to twelve litres of alcohol density 0.8g/cm^3.What is the density of the mixture?

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1. density = total mass/total volume
3 l of water ----> 3000g
12 l of alcohol ----> 12000(.8) = 9600 g

density = (3000+9600)g/15000 cm^3
= ....

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