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Dovator [93]
3 years ago
5

A sample of dinitrogen tetroxide (N204) gas occupies 144 L at STP. How many moles of nitrogen atoms are present in this sample?​

Chemistry
1 answer:
denis23 [38]3 years ago
4 0

Answer:

Molecular (gas and liquid) Edit

Its gas can be easily obtained by heating liquid nitrogen and allowing it to evaporate. It has a wide range of uses and can be used instead of air in environments where oxidation is not desired:

to preserve the freshness of packaged foods,

to cover liquid explosives for safety purposes,

In the production of electronic components such as transistors, diodes and integrated circuits,

in the production of stainless steel,

For filling automobile and aircraft wheels due to its inert, moisture-free and non-oxidizing properties.

It is produced industrially and in large quantities by distillation from liquefied air and although it is defined as LN2, the correct spelling is NO2 (1). It is a freezing liquid and if it comes into contact with living tissue, it causes sudden freezing. If properly isolated from ambient temperature, it creates a source of nitrogen gas that does not require pressure. The ability of water to stay at temperatures well below freezing (77 K, -196 ° C or -320 ° F) makes it possible to use liquid nitrogen in many different areas:

freezing and transporting food products by dipping,

Preservation of living tissues, reproductive cells (sperm, eggs) and other biological samples and materials by freezing,

in visual experiments in science education,

as a heatsink in high sensitivity sensors and low noise amplifiers,

in dermatology. removing unpleasant looking warts or skin wounds with potential cancer risk,

As a cooler in cooling systems of computer hardware such as CPU or GPU.

Edit Acquisition

Nitrogen can be obtained in pure form by the decomposition of sodium acid (NaN3) and ammonium dichromate:

NaN3 → 2Na + 3N2 (300 ° C)

(NH4) 2Cr2O7 → N2 + Cr2O3 + 4H2O

Another method used in obtaining nitrogen is the reaction of ammonia with lime cream:

2NH3 + 3Ca (OCl) → 3CaCl3 + N2 + 3H2O

Edit Precautions

Nitrate fertilizers are dragged by irrigation water of cultivated lands and mixed with rivers and groundwater, causing great pollution. Compounds containing cyano (-CN) form extremely toxic salts and are lethal to all mammals.

Explanation:

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Convert mass to moles for both reactants. (Round to 2 significant figures.)
shepuryov [24]
Mass = mr x moles
Mr of CuCl2 = ( 63.5) + ( 35.5 x 2) = 134.5
2.5 = 134.5 x moles
2.5 / 134.5 = moles
Moles = 0.019 (2DP)

0.25g of Al
Mr of Al = 27
0.25 = 27 x moles
0.25/ 27 = 0.0093 moles (2sf)

Hope this helps :)
6 0
3 years ago
Read 2 more answers
Identify and explain the functions of each numbered plant organ in the diagram
Vaselesa [24]

Answer:

1. Flower

- contain the sexual organs of the plant

- attract insect for pollination

- produce fruit carries the seed during fertilization.

2. Leaf

- capture sunlight for photosynthesis

- responsible to make food

- evaporate water molecules

- movement of oxygen and carbon dioxide in and out to plant

3. Stem

- transport water and nutrients from root to leaves.

- support leaves and branches

- in some plants are photosynthetic

4. Root

-provide support by anchoring the plant

- absorb water and nutrients for growth

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8 0
3 years ago
A gas mixture contains oxygen, nitrogen, and carbon dioxide. It has a pressure of 250 mmHg. If the pressure of oxygen is 50 mmHg
kondor19780726 [428]

Answer:

P_{CO_2}=25mmHg

Explanation:

Hello there!

In this case, according to the Dalton's law, which explains that the total pressure of a gaseous system equals the sum of the partial pressures of the gases composing, for the gaseous mixture composed by oxygen, nitrogen and carbon dioxide it would be possible to write:

P_{tot}=P_{N_2}+P_{O_2}+P_{CO_2}

Now, given the pressure of the system and those of oxygen and nitrogen, we calculate that of carbon dioxide as shown below:

P_{CO_2}=P_{tot}-P_{N_2}-P_{O_2}\\\\P_{CO_2}=250mmHg-50mmHg-175mmHg\\\\P_{CO_2}=25mmHg

Best regards!

4 0
2 years ago
2. The pressure of the oxygen gas inside a
Flauer [41]

Answer: 4.41 atm

Explanation:

Given that,

Original pressure of oxygen gas (P1) = 5.00 atm

Original temperature of oxygen gas (T1) = 25°C

[Convert 25°C to Kelvin by adding 273

25°C + 273 = 298K

New pressure of oxygen gas (P2) = ?

New temperature of oxygen gas (T2) = -10°C

[Convert -10°C to Kelvin by adding 273

-10°C + 273 = 263K

Since pressure and temperature are given while volume is held constant, apply the formula for Charle's law

P1/T1 = P2/T2

5.00 atm /298K = P2/263K

To get the value of P2, cross multiply

5.00 atm x 263K = 298K x V2

1315 atm•K = 298K•V2

V2 = 1315 atm•K / 298K

V2 = 4.41 atm

Thus, the new pressure inside the canister is 4.41 atmosphere

4 0
3 years ago
Which element has a larger atomic radius than sulfur?
Novay_Z [31]

Cadium

Down a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period.

6 0
3 years ago
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