Chemistry · Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both)
The volume of ethyl alcohol (density \) that has to be added to prepare of ethyl
The volume of ethyl alcohol (density \( 1.15 g / c c) \) that has to be added to prepare \( 100 \mathrm{cc} \) of \( 0.5 \mathrm{M} \) ethyl alcohol solution in water is :
- A. \( 1.15 c c \)
- B. \( 2 c c \)
- C. \( 2.15 c c \)
- D. 2.30 \( c c \)
Step-by-step solution
Moles needed = 0.5 M × 0.1 L = 0.05 mol. Mass = 0.05 mol × 46 g/mol = 2.3 g. Volume = mass/density = 2.3 g / 1.15 g/cc = 2 cc.
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