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scZoUnD [109]
3 years ago
12

How could the appearance of a substance change with out it becoming a different substance

Chemistry
1 answer:
gtnhenbr [62]3 years ago
3 0

Answer:

When water melts from ice to liquid, or boils and becomes a gas, it is still water.

Explanation:

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3 years ago
How many grams of potassium chloride are required to make 250 ml of a 0.75 m kcl solution?
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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)

0.1875 m . 74.55 g/m = 13.9 g

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