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Stella [2.4K]
2 years ago
11

Hello people ~

Chemistry
1 answer:
Sever21 [200]2 years ago
7 0
<h3><u>Question:</u><u>-</u></h3>

Criteria for purity of organic solid is

(a) boiling point

(b) melting point

(c) specific gravity

(d) none of these

<h3><u>Answer</u><u>:</u><u>-</u></h3>

(b) melting point

<h3><u>Explanation</u><u>:</u><u>-</u></h3>

Melting point is considered to be the best measure of purity of a substance.

When a purified sample is mixed with a small amount of pure compound , melting point of the mixture is determined.

If a substance is impure (contains impurities/other substance) the melting point of that substance will change.

________________________________

The purity percentage of a substance can be calculated by dividing the mass of the pure chemical by the total mass of the sample and multiplying this number by 100.

[Mass of pure chemical/total mass × 100]

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artcher [175]

Answer:

0.23 g

Explanation:

From the question given above, the following data were obtained:

Mass of solution = 20.3 g

Percentage by mass of KCl = 1.14%

Mass of KCl =?

The mass of KCl in the solution can be obtained as follow:

Percentage by mass = mass of solute / mass of solution × 100

1.14% = mass of KCl / 20.3

Cross multiply

Mass of KCl = 1.14% × 20.3

Mass of KCl = 1.14/100 × 20.3

Mass of KCl = 0.0114 × 20.3

Mass of KCl = 0.23 g

Therefore, the mass of KCl in the solution is 0.23 g

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