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OverLord2011 [107]
3 years ago
15

Which of the following is not true? a. The freezing point of sea water is lower than the freezing point of pure water. b. The bo

iling point of a water sample from the Salt Lake is lower than the boiling point of pure water. c. The freezing point of 0.1 M NaCl is lower than the freezing point of 0.05 M NaCl.
Chemistry
1 answer:
Anna007 [38]3 years ago
5 0

Answer:

The false statement is b.

The boiling point of a water sample from the Salt Lake is lower than the boiling point of pure water

Explanation:

This excersise refers to colligative properties.

Boiling point refers to the property of boiling point elevation. In a solution of ions, as water sea or water from lakes, the boiling point will be higher than water pure.

It is logical to say that, because these sort of water have ions. Remember that colligative properties depends on the solute particles.

T° boiling solution - T° pure solvent = Kb . m . i

In the freezing point depression, we have the oppossite of boiling point elevation. Freezing point of solution is lower than pure solvent, according to this:

T° freezing pure solvent - T° freezing solution = Kc . m . i

We have to always consider the i, which means Van't Hoff factor, number of ions dissolved in solution. As the i is higher, the freezing point of solution will be lower, and the boiling point of solution will be higher.

They are true statement a and c.

In solution of., [NaCl] = 0.1M, as it is a higher concentration, the molality is also higher than a solution of [NaCl] = 0.05.

As water sample form Salt Lake has certain ions, it is logical to say that the boiling point of this water is higher than boiling point of pure water.

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Answer:

\boxed{-6.29 \times10^{5}\text{ J}}

Explanation:

Step 1. Determine the cell potential

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2×[Cr ⟶ Cr³⁺ + 3e⁻]                  0.744  V

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2Cr + 3Cu²⁺ ⟶ 3Cu  + 2Cr³⁺    1.086  V

Step 2. Calculate ΔG°

\Delta G^{\circ} = -nFE_{\text{cell}}^{^{\circ}} = -6 \times 96 485 \times 1.086 = \text{-629 000 J}\\\\= \boxed{-6.29 \times10^{5}\text{ J}}

6 0
3 years ago
You are given a sample of an element with ONE valence electron.
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3 The volume of a gas is 50.0 mL at 20.0 K. What will be the new
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C. 4.00 K

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My role models are my parents. They are my pillars of strength. They are my guide and give me the courage to battle obstacles in life.

My mother, being a working professional, manages all her work perfectly and with efficiency.

My father goes to office, but still does not forget to help me with my studies. They always encourage me in every aspect and motivate me even when I do not succeed.

My mother always smiles, no matter what the circumstances are and that gives me the strength and inspiration to face all problems.

My parents have made me understand what life is about and how to find that little ray of happiness in difficult situations.

What I am today and what I will become in future involves the support and affection of my parents. They have made me disciplined, dedicated and sincere.

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