3 years ago

Câu 12. Hiện tượng nào sau đây không phải là sự nóng chảy?

1 answer:

Alik [6]3 years ago

5 0

Mình nghĩ C là đáp án đúng

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zysi [14]

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5 nitrogen, 1 hydrogen, and 1 oxygen I think

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djverab [1.8K]

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There is no friction because of the mass.

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Mrrafil [7]

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ra1l [238]

Answer:

Dissolve 226 g of KCl in enough water to make 1.5 L of solution

Explanation:

1. Calculate the moles of KCl needed

$n = \text{1.5 L} \times \dfrac{\text{2 mol}}{\text{1 L}}= \text{3.0 mol}$

2. Calculate the mass of KCl

$m = \text{3.0 mol} \times \dfrac{\text{74.55 g}}{\text{1 mol}}= \text{224 g}$

3. Prepare the solution

Measure out 224 g of KCl.
Dissolve the KCl in a few hundred millilitres of distilled water.
Add enough water to make 1.5 L of solution. Mix thoroughly to get a uniform solution.

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3 years ago