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Answer:

8.8g of Al are necessaries

Explanation:

Based on the reaction, 2 moles of Al are required to produce 3 moles of hydrogen gas.

To solve this question we must find the moles of H2 in 11L at STP using PV = nRT. With these moles we can find the moles of Al required and its mass as follows:

Moles H2:

PV = nRT; PV/RT = n

Where P is pressure = 1atm at STP; V is volume = 11L; R is gas constant = 0.082atmL/molK and T is absolute temperature = 273.15K at STP

Replacing:

1atm*11L/0.082atmL/molK*273.15K = n

n = 0.491 moles of H2 must be produced

Moles Al:

0.491 moles of H2 * (2mol Al / 3mol H2) = 0.327moles of Al are required

Mass Al -Molar mass: 26.98g/mol-:

0.327moles of Al * (26.98g / mol) = 8.8g of Al are necessaries

Answer:

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Answer:

Showing changing colour of the skin who exposed to the radiation.

Explanation:

Chernobyl Episode 4 portray the traumatic effects of the situation on people by showing changing colour of skin of the staff present at nuclear reactor at the time of explosion. The people who exposed to the radiations of the nuclear reactor will die later in the hospital which shows that radiation of nuclear reactor is hazardous and damaging for the skin as well as for the body of humans.

Answer:

B. The substance is in the liquid state.

Explanation:

The symbol (l)  in a chemical equation represents that the substance is in liquid state which is one of the physical states of a chemical substance.

Answer:

B: it has a high heat capacity

Explanation:

When any material has a high specific heat capacity/ heat capacity, it doesn't heat or cool very fast. So water can absorb more heat from the engine and can keep the engine cool or at low temperature for a longer period of time.

Answer:

(c) Low temperature, high pressure

Explanation:

Liquefaction of a gas means the conversion of the gas to liquid. To convert a gas to liquid, we have to look a bit at the statements of the kinetic theory of gases.

Gases show ideal behavior within the range of high temperature and low pressure. Under these conditions, minimum intermolecular interactions occur between gas molecules.

However, as the temperature is deceased and pressure in increased, intermolecular interactions become significant and the gas begins to liquefy.

Answer:

There are 3 significant figures on this one.

Answer:

true

Explanation:

Answer: Boron

Explanation:

Answer:

K= 0.0275

Explanation:

The K of a reaction is defined as the ratio between the concentration of products over concentration of reactants powered to its coefficient. In the reaction of the problem, K is:

K = [NH3]² / [N2] [H2]³

Replacing the concentrations in K:

K = [8.62M]² / [9.76M] [6.52M]³

Answer:

The value of K is 0.027.

Explanation:

Chemical equilibrium is a state of a reversible chemical system in which no changes are observed as time passes, despite the fact that the substances present continue to react with each other. That is, the chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.

The Law of Mass Action says that the product of the equilibrium concentrations of the products raised to their respective stoichiometric coefficients, divided by the product of the concentrations of the reactants in the equilibrium raised to their respective stoichiometric coefficients, is a constant for each temperature, called the equilibrium constant Kc. So, being:

aA + bB ⇄ cC + dD

Then: [tex]Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b} }[/tex]

In this case, the reaction is:

N₂ + 3 H₂ ⇒ 2 NH₃

So, the equilibrium constant is:

[tex]Kc=\frac{[NH_{3} ]^{2} }{[N_{2} ]*[H_{2} ]^{3} }[/tex]

Being:

Replacing:

[tex]Kc=\frac{8.62^{2} }{9.76*6.52^{3} }[/tex]

Solving

Kc= 0.027

The value of K is 0.027.

Answer:

b) 4.37x10-3 M. is the correct answer

See the attached page, I've shown the calculation over there

Answer:the third one

Explanation:

Answer:

127 g of Ag are made in the reaction.

Explanation:

Reaction is:  2 AgNO₃ + Cu → Cu(NO₃)₂ + 2 Ag

If we only have data from nitrate, we assume the Cu is in excess.

We determine the moles of silver nitrate:

Mass / Molar mass → 200 g / 169.87 g/mol = 1.18 moles

Ratio is 2:2. If 2 moles of silver nitrate produce 2 moles of Ag, then

1.18 moles of salt, will produce 1.18 moles of silver

We convert mass to moles:

1.18 mol . 107.87 g/mol = 127 g

Answer:

-2, -1, 0, 1, 2

Explanation:

There are four types of quantum numbers;

1) Principal quantum number (n)

2) Azimuthal quantum number (l)

3) magnetic quantum number (ml)

4) Spin quantum number (s)

The azimuthal quantum number (l) describes the orbital angular momentum and shape of an orbital while the magnetic quantum number shows the projections of the orbital angular momentum along a specified axis.  This implies that the magnetic quantum number shows the orientation of various orbitals along the Cartesian axes. The values of the magnetic quantum  number ranges from -l to + l

For l= 2, the possible values of the magnetic quantum number are; -2, -1, 0, 1, 2

Answer:

It is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.

Explanation:

In an endothermic reaction, the reaction requires a determined amount of energy to occurs.

The reaction of the problem has H = -600kJ/mol. The reaction is endothermic and the energy that the reaction needs is absorbed by the reactants. That means, the energy of products:

Is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.

Answer:

It is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.

Explanation:

Answer:

OK i see

Explanation:

Answer:

1. 92.5 ml

2. 3.13 L

3. 524.48 K

Explanation:

1. Using Boyle's law equation:

P1V1 = P2V2

Where;

P1 = initial pressure (atm)

V1 = initial volume (ml)

V2 = final volume (ml)

P2 = final pressure (atm)

Based on the information in question 1: P1 = 3.7atm, P2 = 1atm, V1 = 25 mL, V2 = ?

3.7 × 25 = 1 × V2

92.5 = V2

V2 = 92.5ml

2. Using Charles law equation as follows:

V1/T1 = V2/T2

Where;

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

Based on the information provided: V1 = 3L, V2 = ?, T1 = 25°C = 25 +273 = 298K, T2 = 38°C = 38 + 273 = 311K

3/298 = V2/311

Cross multiply

298 × V2 = 3 × 311

298V2 = 933

V2 = 933 ÷ 298

V2 = 3.13L

3. Using Charles law equation as follows:

V1/T1 = V2/T2

Where;

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

Based on the information provided; V1 = 1.72 L, T1 = 18°C = 18 + 273 = 291K, T2 = ?, V2 = 3.1L

1.72/291 = 3.1/T2

Cross multiply

1.72 × T2 = 291 × 3.1

1.72T2 = 902.1

T2 = 902.1 ÷ 1.72

T2 = 524.48K

Answer:

d answer is correct

Explanation:

the deeperinto Earth’s crust the higher the pressure that forms mateamorphic rocks

The deeper into Earth’s crust, the higher the pressure that forms metamorphic rocks is the best statement  regarding metamorphic rock formation. Thus, option D is correct.

Metamorphism, a process that changes one type of rock into another, is the source of metamorphic rocks. The original rock is frequently subjected to pressures of at least 100 megapascals and temperatures between 150 and 200 °C, which profoundly alter its physical or chemical composition.

They are commonly used in both architecture and art. Statues and decorative objects like vases are made of marble (Figure). Due to its extreme hardness, quartzite is frequently crushed and used to construct train rails.

Therefore, option D is correct, that the best statement about the creation of metamorphic rocks is that the pressure increases the deeper into the Earth's crust.

Learn more about the metamorphic rocks, refer to:

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Answer: The 3rd one

Explanation: Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

I might be wrong

Answer:

NO2 is the molecular formula  of nitrogen Oxide​

Explanation:

Correct question

An oxide of nitrogen contain its own volume of nitrogen

its vapour dentity is 23. Find the molecular formula

Of nitrogen Oxide

Solution

As we know

Molecular Weight  is equal to two times the  vapour density

Hence, the molecular weight of Oxide of nitrogen is 2 * 22 = 44

Molecular weight of Oxide of nitrogen  is the sum of atomic weight of nitrogen and oxygen

Molecular weight of Oxide of nitrogen = 14 + 16 *Y

14 + 16 *Y  = 46

Y = 2

Hence, the formula is NO2

Answer:

Density = 7 g/mL

Explanation:

Given that,

Mass of a sample, m = 14 g

Volume of the sample, V = 2 mL

We need to find the density of the liquid sample. We know that the density of an object is given by :

[tex]d=\dfrac{m}{V}\\\\d=\dfrac{14\ g}{2\ mL}\\\\d=7\ g/mL[/tex]

So, the density of the liquid sample is 7 g/mL.

Answer:

If it is unsaturated, we can dissolve some more amounts of potassium nitrate into it Explanation:

0.92 × 1/46 × 2/1 × 12/1 =

0.02 × 2 × 12 =

0.04 × 12 =

0.48 gr carbon

The mass of carbon in one mole of ethanol (46.03 g) is 12.0 g. Thus, mass of carbon in 0.92 g of ethanol is 0.48 g.

Ethanol is an alcohol with the formula C2H5OH. This organic compound having a molecular weight of 46.03 g/mol.

Atomic mass of carbon = 12.01 g/mol

                         oxygen = 16 g/mol

                    hydrogen  = 1.01 g/mol

Thus total mass of one mole of ethanol = (12.01×2) +(16) +(6×1.01) = 46.03 g/mol

46.03 g of ethanol contains 2402 g of carbon. Thus mass of carbon in 0.92 g of ethanol is calculated as follows;

(24.02 × 0.92) / 46.03 = 0.48 g

Hence, the mass of carbon in 0.92 g of ethanol is 0.48 g.

To  learn more about ethanol, refer the link below:

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Answer:

Electroplating is the process of applying a metal coating on another piece of metal (or another conductive surface) through an electro-deposition process. In electroplating, the deposited metal becomes part of the existing product with the plating/coating.

Explanation:

( ◜‿◝ )♡

Answer:

bismuth

Explanation:

i think if not i am so sorry

Answer:

So none of the option is correct.

Explanation:

The energy is the capacity of to work.

It is a scalar quantity.

According to the law of conservation of energy, the energy can neither be created and nor be destroyed, it can transform from one form to another.

For example, in case of a light bulb, the electric energy is converted into the light and heat energy.

When a battery operated robot with glowing eyes moving on the floor, the chemical energy of the battery is converted into the light energy and the kinetic energy so the law of conservation of energy holds good.

Answer:

energy stored is potential.

Explanation:

Answer:

Hello There!!

Explanation:

I believe the answer is nuclear.

hope this helps,have a great day!!

~Pinky~

Answer:

C) Nuclear

Explanation:

Trust the process

Edge 2021

2 FeO + 1 C ===》2 Fe + 1 CO2

Explanation:

Fe2O2+C-----> 2Fe+CO2

balanced equation..

hope it helps.