In: Physics
A container has 9.0 ml of liquid X with a density of 1200 kg/m3. How much liquid Y with a density of 1400 kg/m3 should be added to the flask so that the density of the liquid mixture is 1280 kg/m3?
Ans
The volume of liquid Y = 6 ml should be added to the flask.
Explanation
The density of liquid X is x = 1200 Kg/m3
The volume of liquid X is Vx = 9.0 ml
As 1 ml = 10-6 m3
Thus Vx = 9.0 10-6 m3
Mass of liquid X is Mx = x Vx = 1200 9.0 10-6
Mx = 1.080 10-2 Kg
The density of liquid Y is y = 1400 Kg/m3
Let Vy volume of liquid Y should be added to the flask
Mass of liquid Y is My = y Vy = 1400 Vy
Total Mass in flask M = Mx + My
M = 1.080 10-2 + 1400 Vy
Total volume in flask V = Vx + Vy
V = 9.0 10-6 + Vy
Density of liquid mixture is = 1280 Kg/m3
As
1280 (9.0 10-6 + Vy ) = 1.080 10-2 + 1400 Vy
1.152 10-2 + 1280 Vy = 1.080 10-2 + 1400 Vy
1.152 10-2 - 1.080 10-2 = 1400 Vy - 1280 Vy
0.072 10-2 = 120 Vy
Vy = 6 10-6 m3
Vy = 6 ml
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