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Lana71 [14]
2 years ago
12

Aluminum metal can be recycled from scrap metal by melting the metal to evaporate impurities. a. Calculate the amount of heat ne

eded to purify 1.00 mole of Al originally at 298 K by melting it. The melting point of Al is 933 K. The molar heat capacity of Al is 24 J/(mol K), and the heat of fusion of Al is 10.7 kJ/mol.
Chemistry
1 answer:
fenix001 [56]2 years ago
6 0

The amount of heat required to purify the Al is 25.94 * 10^3 J

<h3>What is heat capacity?</h3>

The term heat capacity refers to the amount of heat required to raise the temperature of a substance by 1K. The aluminum was heated from 298 K to 933 K then it melted.

The total heat required is;

H = ncdT + nL

H = (1 * 24 * (933 - 298)) + (1 * 10.7 * 10^3)

H = 15.24 * 10^3  J + 10.7 * 10^3 J

H = 25.94 * 10^3 J

Learn more about heat capacity: brainly.com/question/1453843

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4 0
1 year ago
How many grams of potassium chloride are required to make 250 ml of a 0.75 m kcl solution?
DedPeter [7]

Answer:

The solution would need 13.9 g of KCl

Explanation:

0.75 m, means molal concentration

0.75 moles in 1 kg of solvent.

Let's think as an aqueous solution.

250 mL = 250 g, cause water density (1g/mL)

1000 g have 0.75 moles of solute

250 g will have (0.75 . 250)/1000 = 0.1875 moles of KCl

Let's convert that moles in mass (mol . molar mass)

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