Brine has a density of 1.2 g/cc. 40 cc of it is mixed with 30 cc of water. The density of the solution is:

2.11 g/cc

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1.11 g/cc

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12.2 g/cc

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20.4 g/cc

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Solution

The correct option is B 1.11 g/cc
$ρ_{m i x t u r e} = \frac{ρ_{1} V_{1} + ρ_{2} V_{2}}{V_{1} + V_{2}}$

$= \frac{1.2 \times 40 + 1 \times 30}{70} = \frac{78}{70}$

$ρ_{m i x t u r e} = 1.11 g m / c c$

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