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Anna35 [415]
3 years ago
13

For this exercise, we will consider a solution of the nonvolatile solvent ethylene glycol, C2H4(OH)2, in water. If the solution

contains 1 mol of C2H4(OH)2 for each 4 mol of H2O, what is the mole fraction of water?
Chemistry
1 answer:
Lemur [1.5K]3 years ago
3 0

Answer:

Mole fraction of water is 0.8.

Explanation:

Mole fraction is defined as ratio of moles of single component to the sum of moles of all components present in the solution.

Moles of ethylene glycol = n_1=1 mol

Moles of water = n_2=4 mol

Mole fraction of ethylene glycol = \chi_1=\frac{n_1}{n_1+n_2}

\chi_1=\frac{1 mol}{1 mol+4 mol}=0.2

Mole fraction of water  = \chi_2=\frac{n_2}{n_1+n_2}

\chi_2=\frac{4 mol}{1 mol+4 mol}=0.8

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Answer:

strength = 10⁻²/10⁻³ = 10 times more acidic

Explanation:

1. A solution with a pH of 9 has a pOH of

pH + pOH = 14 => pOH = 14 - pH = 14 - 9 = 5

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3. How many times more acidic is a solution with a pH of 2 than a solution with a pH of 3?

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soln with pH = 3 => [H⁺] = 10⁻³M

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4. What is the hydrogen ion concentration [H + ] in a solution that has a pH of 8?

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8 0
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An igneous rock that _____ is made of really small mineral crystals. A. cools rapidly B. crystallizes slowly C. undergoes extrem
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Answer: An igneous rock that cools rapidly is made of really small mineral crystals.

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The layers inside the earth are hot enough to melt a rock. The liquid or molten rock is known as magma.

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The slow cooling of magma will result in the formation of an igneous rock with large crystals. Whereas, rapid cooling of lava will result in the formation of an igneous rock with small crystals.

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