Alcohol of mass 21g and density 0 7g cm-3 is mi... - WAEC Physics 2014 Question
Alcohol of mass 21g and density 0.7g cm-3 is mixed with 10g of water. Determine the density of the mixture [density of water = 1.0gcm-3]
A
0.775gcm-3
B
0.875gcm-3
C
0.780gcm-3
D
0.880gcm-3
correct option: a
(V_A = \frac{M}{D} = \frac{21}{0.7} = 30cm^3)
(V_w = \frac{M}{D} = \frac{10}{1} = 10cm^3)
Vmixture = 30 + 10 = 40cm3
Mmixture = 21 + 10 = 31g
Dmixture = (\frac{m}{v} = \frac{31}{40} = 0.775)
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