Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options given.
For a solution containing 25% ethanol, 25% acetone, 25% acetic acid and 25% water
| Column I | Column II |
| (a) Mole fraction of ethanol | (i) 0.500 |
| (b) Mole fraction of acetone | (ii) 0.150 |
| (c) Mole fraction of acetic acid | (iii) 0.155 |
| (d) Mole fraction of water | (iv) 0.195 |
Answer & explanation
Correct answer: option 1
The correct answer is option 1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i).
| Column I | Column II |
| (a) Mole fraction of ethanol | (iv) 0.195 |
| (b) Mole fraction of acetone | (iii) 0.155 |
| (c) Mole fraction of acetic acid | (ii) 0.150 |
| (d) Mole fraction of water | (i) 0.500 |
Given the solution contains:
25 g ethanol (\(C_2H_5OH\))
25 g acetone (\(CH_3COCH_3\))
25 g acetic acid (\(CH_3COOH\))
25 g water (\(H_2O\))
First, we calculate the number of moles for each component:
Ethanol (\(C_2H_5OH\)):
Molar mass of ethanol = 46 g/mol
Moles of ethanol = \(\frac{25 \text{ g}}{46 \text{ g/mol}} = 0.543 \text{ mol}\)
Acetone (\(CH_3COCH_3\)):
Molar mass of acetone = 58 g/mol
Moles of acetone = \(\frac{25 \text{ g}}{58 \text{ g/mol}} = 0.431 \text{ mol}\)
Acetic acid (\(CH_3COOH\)):
Molar mass of acetic acid = 60 g/mol
Moles of acetic acid = \(\frac{25 \text{ g}}{60 \text{ g/mol}} = 0.417 \text{ mol}\)
Water (\(H_2O\)):
Molar mass of water = 18 g/mol
Moles of water = \(\frac{25 \text{ g}}{18 \text{ g/mol}} = 1.389 \text{ mol}\)
Next, we calculate the total number of moles in the solution:
Total moles = \(0.543 + 0.431 + 0.417 + 1.389 = 2.78 \text{ mol}\)
Now, we calculate the mole fraction for each component:
Mole fraction of ethanol, \(X_{ethanol} = \frac{0.543}{2.78} = 0.195\)
Mole fraction of acetone, \(X_{acetone} = \frac{0.431}{2.78} = 0.155\)
Mole fraction of acetic acid, \(X_{acetic acid} = \frac{0.417}{2.78} = 0.150\)
Mole fraction of water, \(X_{water} = \frac{1.389}{2.78} = 0.500\)
Therefore, the correct option is 1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)