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]

0.775gcm^-3

0.875gcm^-3

0.780gcm^-3

0.880gcm^-3

Correct answer is A

$V_A = \frac{M}{D} = \frac{21}{0.7} = 30cm^3$

$V_w = \frac{M}{D} = \frac{10}{1} = 10cm^3$

V_mixture = 30 + 10 = 40cm³

M_mixture = 21 + 10 = 31g

D_mixture = $\frac{m}{v} = \frac{31}{40} = 0.775$

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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]

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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]