Part A
45g of gasoline are mixed with 45g of water. What is the average density of the mixture?
Express your answer using two significant figures.
Part B
55cm3 of gasoline are mixed with 60cm3 of water. What is the average density of the mixture?
Express your answer using two significant figures.
part A
the density of gasoline is approx 0.75g/cm^3 (it varies depending
on the exact type of gas); the density of water is
1g/cm^3
the weighted average of densities is
avg density = (45g x 0.75g/cm^3 + 45g x1 g/cm^3)/(45g+45g) =
0.875 g/cm^3
part B
55g of gasoline are mixed with 60 g of water. What is the average
density of the mixture.
first u need the gasoline and water density from
tables:
gasoline density = 0.7g/cm3
water density = 1g/cm3
water volume = 60g /(1g/cm3) = 60cm3
gasoline volume = 55 / (0.7g/cm3) = 78.57cm3
total volume = 60 + 78.57 = 138.57 cm3
total mass = 55 + 60 = 115g
density of mix = 115 /138.57 = 0.829
kg/m3
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