How many moles of oxygen gas (02) are
needed to completely react with 54.0 g of aluminum?

4A1+30₂ → 2Al2O3

54.0 g Al

1 mol Al 3 mol O₂
26.98 g Al 4 mol Al



[?] mol O₂

Answer: Initially when the student spilled the bottle of ammonia the ammonia gas particles diffused with the particles of air in the room. We know that the rate of diffusion of gases is very high. So the entire room filled up with the pungent smell of ammonia.

When he opened the doors and windows and switched on the exhaust fan, the air from the room along with the ammonia gas diffused with the air outside the room.Moreover, outside air entered into the room so the concentration of ammonia gas in the room air reduced.Due to these reasons the student got relief.

Answer:

C.) 4.85 x 10⁻¹⁹ J

Explanation:

To find the energy, you need to use the following equation:

E = hc / w

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> c = speed of light (3.00 x 10⁸ m/s)

-----> w = wavelength (m)

Once you have converted nanometers to meters, you can plug the given values into the equation and solve.

410 nm                1 m
-------------  x  ----------------------  =  4.10 x 10⁻⁷ m
                        1 x 10⁹ nm

E = hc / w

E = (6.626 x 10⁻³⁴ J*s)(3.00 x 10⁸ m/s) / (4.10 x 10⁻⁷ m)

E = 4.85 x 10⁻¹⁹ J

Answer: C

Explanation:

iron sulfide.

Answer:

C. Iron sulfide

Explanation:

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The number of moles of hydrogen atoms contained in 1 mole of c6h12 is 12.

Hydrogen can be produced from various domestic resources such as fossil fuels, biomass, and the electrolysis of water by electricity. The environmental sustainability and energy efficiency of hydrogen depends on how hydrogen is produced.

Hydrogen is the simplest element. Each hydrogen atom has only one proton. Hydrogen is also the most abundant element in the universe. Stars like the Sun are mainly made of hydrogen. The sun is essentially a giant sphere of hydrogen and helium gas.

Some facts about hydrogen:

Fuel cell vehicles are very similar to traditional gasoline vehicles

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Answer:

See below

Explanation:

The way to calculate this

  speed of light =  wavelength * frequency

   3 x 10 ^8 m/s   =   wavelength * 2450000000 Hz

       wavelength = .12245 meters

                    = 1.2245 x 10^-1  Meters  

The wavelength of a microwave with a frequency of 2450 mhz is 1.2245 x 10⁻¹ meters.

The wavelength is the time period or spatial period between the periodic wave and the distance between two waves. A microwave is a form of electromagnetic radiation.

The frequency of a microwave, f = 2450 MHz

We need to find the wavelength and the period of the microwaves

c = f λ

c = speed of light = 3 x 10 m/sec. 8 c = λf where λ = wavelength, f = frequency. Length

The relation between the wavelength and frequency is given by

The speed of light =  wavelength x frequency

3 x 10⁸ m/s   =   wavelength x 24500 Hz

Wavelength = .12245 meters

1.2245 x 10⁻¹  Meters  

Therefore, the wavelength of a microwave with a frequency of 2450 MHz is 1.2245 x 10⁻¹ meters.

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Answer:

I don't see a question.

Explanation:

I do see a reaction in which tells us that the C2H4 has a double-bonded C.  The additrtion of H2 breaks this bond and provides the two bonding sites needed for the 2 new hydrogen atoms.

H2C=CH2 + H2 → H3C-CH3

Rank the gases Ar, N2, CH4, and C2H6 in order of increasing density at STP.

ans : CH4

Answer:

a.  V=44.9mL

Explanation:

For a gas undergoing all of these changes, it will be important to combine Boyle's Law and Charles' Law to form the following equation (if it isn't already known):

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

Where the Temperatures must be measured in Kelvin.

Recall that to convert Celsius to Kelvin, one must add 273 or use the equation [tex]T_C+273=T_K[/tex].

Thus, [tex]T_1=(18.1+273)[K]=291.1[K][/tex]  and [tex]T_2=(12.5+273)[K]=285.5[K][/tex]

To solve for the requested quantity, note that all of the other units match between beginning and end, so we substitute and solve:

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

[tex]\dfrac{(2.61[atm])V_1}{(291.1[K])}=\dfrac{(1.92[atm])(59.9[mL])}{(285.5[K])}[/tex]

[tex]\dfrac{(2.61[atm] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})\bold{V_1}}{291.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}*\dfrac{291.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}{2.61[atm]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}=\dfrac{(1.92[atm]\!\!\!\!\!\!\!\!\!\!\!{--})(59.9[mL])}{285.5[K\!\!\!\!\!{-}]}*\dfrac{291.1[K\!\!\!\!\!{-}]}{2.61[atm]\!\!\!\!\!\!\!\!\!\!\!{--}}[/tex]

[tex]V_1=44.928677576[mL][/tex]

Accounting for significant digits, [tex]V_1=44.9[mL][/tex]

Answer:

Amm is this right (if is it the right so mark me the brainliest pls)

Explanation:

Answer : Solutions- Brine, Soda water. Suspensions- Muddy river water, Chalk water mixture, Milk of magnesia, Smoke in air. Colloids- Milk, Ink, Blood, shaving cream.

The weakness of the rutherford model of the atom that bohr addressed is that

The Rutherford model of the atom proposed by Ernest Rutherford in 1911 shows that the atom is much hollow space with its mass concentrated at the center being surrounded by electrons. It is the planetary model.

The Bohr model of the atom proposed by Neils Bohr in 1913 suggests that

The weakness of the rutherford model of the atom that bohr addressed is that

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The mass of Xe present in the syringe given the data is 0.183 g

Using the ideal gas equation, we can obtain the mole of Xe as follow:

n = PV / RT

n = (0.98 × 0.035) / (0.0821 × 298)

n = 0.0014 mole

Mass = mole × molar mass

Mass of Xe = 0.0014 × 131

Mass of Xe = 0.183 g

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Answer:

6.41 gm / cm^3

Explanation:

cube volume =    2.72 x 2.72 x 2.72 cm^3  = 20.124

Density =   mass / volume = 129 g / 20.124 cm^3 = 6.41 gm / cm^3

Answer:

the element is oxygen

Explanation:

it will react to give H2O

The yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.

Yeast metabolizes sugar or glucose to produce alcohol and carbon dioxide.

The carbon dioxide produced is responsible for the raising action of yeast on dough and for the inflation of the balloon.

In the experiment, the possible reason why the balloon did not inflate is that the yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.

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A compound formed between Magnesium and Sulfur is MgS.

Cations are positively-charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons).

Magnesium, Mg, is located in period 3, group 2 of the periodic table, and has two electrons on its outermost shell.

On the other hand, sulfur, S, is located in period 3, group 16 of the periodic table, and has six electrons on its outermost shell.

Chemical reactivity is governed by an atom's "desire" to have a stable electron configuration and to have eight electrons in its outermost shell to complete an octet.

In this case, magnesium can complete its octet by giving up those two valence electrons, becoming the magnesium cation.

[tex]Mg^{2+}[/tex], in the process.

Sulfur, which only needs two electrons to complete its octet, will pick up the two electrons coming from magnesium, becoming the sulfide anion,

[tex]S^{2−}[/tex], in the process.

The electrostatic force of attraction will then bring the magnesium cations and the sulfur anions together to form an ionic bond.

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The greatest progress in reducing atmospheric levels of lead pollution resulted from the elimination of leaded gas.

Atmospheric lead pollution refers to the presence of lead particles in the atmosphere.

Lead is a pollutant which affects the respiratory system.

Fuels that contains lead when burned releases lead into the atmosphere.

Therefore, the greatest progress in reducing atmospheric levels of lead pollution resulted from the elimination of leaded gas.

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The weak acid will have fewer ions than the strong acid of similar concentration.

The chemical reactions for a weak acid and a strong acid is given below:

Strong acids are acids which dissociate completely in solutions. Examples of strong acids are hydrochloric acid and sulfuric acid.

Weak acids are acids which dissociate only partially in solutions. Examples of weak acids are carbonic acid and acetic acid.

Weak acids of a similar concentration to a strong acid have fewer hydrogen ions.

The equation of the dissociation of strong acids and weak acids are given below:

In conclusion, weak acids produce few ions in solution while strong acids fully dissociate into ions in solution.

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Answer: Fe2O3

Explanation: By applying crisscross method, the formula will be Fe2O3.

CaF₂ ⇒ Ca²⁺ + 2F⁻

1.75       1.75     3.5

the quality of being periodic the tangency to record the intervals

the prediotic of the sun sports cycle

-1.09'C is the change in freezing point

“Freezing point depression” depends on the solvent and the molar concentration of the solute.

Sulfide is highly basic, consequently

K2S

completely and irreversibly hydrolyzes in water according to the following equation:

K2S+H2O→KOH+KSH

Freezing, also known as solidification, is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point.

the temperature at which a liquid solidifies specifically : the temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure : melting point the freezing point of water is 0° Celsius or 32° Fahrenheit.

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Answer:1.0881

Explanation:

The carbocation stabilized by resonance structure and thereby lowers the energy of the carbocation, hydrogen will add to the carbon in the double bond that produces delocalization of electrons.

A carbocation is a molecule in which a carbon atom has a positive charge and three bonds.

In general, electrons are stabilized by delocalization. The stabilization energy engendered by delocalization over more than two atoms is called the resonance stabilization energy or simply the resonance energy. The greater the extent of electron delocalization the greater the resonance stabilization.

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Answer:

Explanation:

i ned help

Answer:

12.5g

Explanation:

1. Percentage of solution = 5.

2. Mass of solution = 250g.

3. = Mass of solute / 250 x 100.

4. = 5 x 250 / 100.

5. = 12.5g.

2AgBr(s) ⇒ 2Ag(s) + Br₂(l) ΔH = -220kJ ⇒ for 2 mol Ag

mol Ag = 7.08 : 108 g/mol = 0.065

the enthalpy change = 0.065/2 x -220 kJ = -7.15 kJ

Answer:

Any characteristic that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more, are considered properties of matter.

Answer:

See below

Explanation:

Simply :    2.357 g / 75 ml = .03142  gm/ml   or  31.42  gm / liter