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2 years ago

Fish need about 5 ppm oxygen dissolved in water to survive. Will water with 5 mg oxygen per

Chemistry

1 answer:

Lelechka [254]2 years ago

3 0

5mg in liter is 5 ppm

Explanation: 1 ppm is one part per million.

1 ppm is 1 mg is one part of million from 1 kg = 1000 000 mg

1 litre water is 1. Kg.

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(23.4m)(14m) rounded off to the correct number of significant figures

VARVARA [1.3K]

The value of the given expression up to correct significant figures is $330 m^2$ .

The rule that applies for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The rule that applies for the addition and subtraction is :

The least precise number present after the decimal point determines the number of significant figures in the answer.

Given:

The expression: (23.4m)(14m)

To find:

The answer up to correct a number of significant figures.

Solution

Number of significant figures in '23.4' = 3

Number of significant figures in '14' = 22

$=(23.4m)(14m)\\=(23.4m)\times (14m)\\=327.6 m^2$

The number with the least significant figures is '14' is 2, so the answer will be reported up to 2 significant figures:

$=327.6 m^2\approx 330 m^2$

Number of significant figures in '330' = 3

The value of the given expression up to correct significant figures is $330 m^2$ .

Learn more about significant figures here:

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2 years ago

Những oixt nào sau đây Na2O CO2 ZnO N2O5, oxit nào tác dụng đc với<br> a.H2O b.HNO3 c.KOH

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gasoline is separated from crude oil by heating it until it reaches it's boiling point. which separation method is used?

Orlov [11]

Answer:

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Explanation:

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