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3 years ago

The proportion of dissolved substances in seawater is usually expressed in

Chemistry

1 answer:

LiRa [457]3 years ago

3 0

Answer:

The proportion of dissolved substances in seawater is usually expressed in ppm, ppb or ppt

Explanation:

The concentration of very diluted solutions should be expressed in parts per million, billion or trillion.

ppm = mass from the solute . 10⁶ / mass or volume of the solution

ppb = mass from the solute . 10⁹ / mass or volume of the solution

ppt = mass from the solute . 10¹² / mass or volume of the solution

ppm = mg/kg, μg/g, μg/mL → These are the units

ppb = ng/g

ppt = pg/g

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Answer:

Molecular formula naphthalene → C₁₀H₈

Empirical formula naphthalene → C₅H₄

Explanation:

Centesimal composition means that in 100 g of compound we have x g of the element. Therefore in 100 g of naphthalene we have:

93.7 g of C

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Let's make a rule of three:

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128. 6.3 / 100 = 8 g of H

We convert the mass to moles, by molar mass:

120 g . 1mol / 12 g = 10 moles C

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Empirical formula naphthalene → C₅H₄

(The sub-index of each element is divided by the largest possible number)

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Answer: hello your question has some missing details attached below is the missing details

answer : 25.5% ( B )

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<u>Determine percentage yield </u>

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theoretical yield ( LiH ) = 4 * 7.95 = 31.8 g

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= 8 * 100/31.8

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