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3 years ago

The main source of phosphorous is in: rocks water plants the atmosphe

Chemistry

1 answer:

Cerrena [4.2K]3 years ago

4 0

The answer would be rock

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Calculate the mass of water vapour present in a room of volume 400 m3 that contains air at 27 °C on a day when the relative humi

Alex73 [517]

Answer:

Mass of water = 6251. 706g or 6.25Kg

Explanation:

Relative humidity = (actual vapor pressure/saturation vapor pressure) * 100%

Actual vapor pressure, Pw = relative humidity * saturation vapor pressure

Pw = 60% * (35.6 *0.001)atm = 0.0216atm

Note: 1mbar = 0.001atm

Using the ideal gas equation: PV=nRT; where P = Pw= 0.02136atm, V= (400

* 1000)dm^3, R= 0.082 atmdm^3/kmol, T= (27+273)K, n = number of moles

Note: 1m^3 = 1000dm^3,R is the molar gas constant.

Making n subject of the formula, n = PV/RT

n= (0.02136 * 400000)/(0.082 * 300) = 347.317 moles

Mass (g) = number of moles (n) * molar mass

molar mass of water=18g

Mass of water = 347.317 * 18 = 6251. 706g or 6.25Kg

6 0

3 years ago

HELP ASAP WROTH 20 POINTS

Xelga [282]

Answer:

Im pretty sure its DNA

Hope this is right .-.

8 0

3 years ago

Copper (Cu) is often used for electrical wiring and cooking pans. However, iron (Fe) is much more common on Earth than copper. W

Sergeeva-Olga [200]

What iron gives in its abundance, it takes away in it's inability to really conduct heat and electricity well. There is enough copper around, if we are careful in its use, to make copper bottomed pots and pans. Of the three best conductors in the world (silver, gold and copper) only copper has enough around and can be inexpensively mined that we make use of it.

If you google dr. copper, you will find he is an economist as well. Copper measures the wealth of an economy by how much is used. So iron might be cheaper and more abundant, but copper will save you much more in trying to do something with it.

5 0

3 years ago

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Single-celled organisms need a microscope to be seen...<br> O True<br> O False

NNADVOKAT [17]

Answer:

True

Explanation:

Microscope is an instrument which is used to observe small objects. There are many types of microscope with a different magnitude.

4 0

3 years ago

What is a sentence using composition.<br>

klemol [59]

Answer:

Son aquellas en las que hay más de un verbo núcleo de predicado, por lo que dos o más oraciones forman una más grande; por ejemplo: A Carlos le gusta el fútbol, pero a María solo le gusta el cricket.

Explanation:

7 0

3 years ago

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