Which of the following is correct for adsorption theory of Heterogeneous catalysis? Statement-I : This theory explains why the catalyst remains unchanged in mass and chemical composition at the end of the reaction. Statement-II : This theory explains the action of catalytic promoters and catalytic poison.
Statement-I is true, Statement-II is false
Statement-I is false, Statement-II is true
Both Statement-I and Statement-II are true
Both Statement-I and Statement-II are false

please answer rightly

Answer: The molality of [tex]NaC_2H_3O_2[/tex] solution is 0.782 m

Explanation:

Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molality:

[tex]\text{Molality of solution}=\frac{\text{Moles of solute}}{\text{Mass of solvent (in kg)}}[/tex] .....(1)

Given values:

Moles of [tex]NaC_2H_3O_2[/tex] = 0.395 mol

Mass of solvent (water) = 0.505 kg

Putting values in equation 1, we get:

[tex]\text{Molality of }NaC_2H_3O_2=\frac{0.395mol}{0.505kg}\\\\\text{Molality of }NaC_2H_3O_2=0.782m[/tex]

Hence, the molality of [tex]NaC_2H_3O_2[/tex] solution is 0.782 m

Answer:

It's answer is c) exactly 37 protons

Answer:

C) ,  Exactly 37 protons.

Explanation:

Remember the electrons have a negative charge, so to make a atom with 37 electrons neutral, you will need the same amount of the opposite type. That means you need 37 protons.

Answer:

put a salt into the beakers

Answer:

ΔS⁰ = -181.1J/molK

Explanation:

ΔS⁰ of a reaction is defined as the sum of the entropies of the reactants times its reaction coefficient minus the sum of the entropies of the products times its reaction coefficient. For the reaction in the problem:

ΔS⁰ = 2*S{NaCl(s)} - (2*S{Na(s)}+S{Cl2(g)})

ΔS⁰ = 2*72.1J/molK - (2*51.1J/molK + 223.1J/molK)

Answer:

Why do you need good toothpaste?

Explanation:

Answer:

Do this yourself smh this isnt what the wesite is for

Explanation:

Answer:

A heatwave occurs when a system of high atmospheric pressure moves into an area and lasts two or more days.

Explanation:

In such a high-pressure system, air from upper levels of our atmosphere is pulled toward the ground, where it becomes compressed and increases in temperature.

Answer:

[tex]{ \tt{k _{c} = \frac{[Na_{2} O _{2} ]}{[Na] {}^{2} [O _{2} ]} }}[/tex]

Answer:

See explanation

Explanation:

The balanced reaction equation is;

2CH3OH + 302 --> 2C02 + 4H20

Number of moles of of methanol = 6.40g/32.04 g/mol= 0.1998 moles

2 moles of methanol yields 2 moles of CO2

0.1998 moles of methanol also yields 0.1998 moles of CO2

Number of moles of oxygen = 10.2g/32g/mol = 0.3188 moles

3 moles of oxygen yields 2 moles of CO2

0.3188 moles of oxygen yields 0.3188 × 2/3= 0.2125 moles of CO2

Hence, methanol is the limiting reactant

Mass of CO2 produced = 0.1998 moles of CO2 × 44g/mol = 8.79g

Theoretical yield = 8.79g

%yield = actual yield/theoretical yield × 100

% yield = 6.12/8.79 × 100

%yield = 69.6%

Answer:

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Explanation:

everything can be found in the picture

Explanation:

ionisation energy decrease down the group as the atomic radius increases. Nuclear charge increases. Number of shell increases so the electron will experience more shielding so it would be easier for the atom to loss electron.

Answer:D. it lowers the amount of evergy needed for a reaction to occur.

Explanation:

a p e x

The concept Arrhenius equation is used here to determine the factor which increases the number of reactions. As the temperature increases, It increases the collisions that have enough energy to react. The correct option is B.

An equation which represents the relationship between the activation energy and rate of the reaction is known as the Arrhenius equation. According to this concept, lower the activation energy of a reaction, the higher its rate will be.

The equation is:

[tex]k = A . e^{-} ^{E_{a} } / RT[/tex]

k - Rate constant

A - Frequency factor

Eₐ - Activation energy

R - Gas constant

T - Temperature

When the temperature increases, the energy and speed of the molecules increases which in turn increases the number of effective collisions. If greater the value of frequency of collisions, then value of 'k' will be higher and greater is the number of reactions.

Thus the correct option is B.

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https://brainly.com/question/30546888

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Answer:

C

Explanation:

In thermodynamics, a exothermic system looses heat to the surroundings while an endothermic system absorbs heat from the surroundings.

A system is a part the universe marked off by a specified boundary. The contents of the cup constitutes the system in this case.

The region of space outside the system is called the surroundings. Hence everything outside the cup constitutes the surroundings.

Answer:

gravity

Explanation:

Gravity is an example of the force of attraction between two objects that have mass.

Answer:

How much energy would be produced from the reaction of 2.40 moles hydrogen with 3.95 moles chlorine?

[tex]H_2 + Cl_2 -> 2HCl , deltaH = -554 kJ[/tex]

Explanation:

Given,

2.40 moles hydrogen reacts with 3.95 moles chlorine.

From the balanced chemical equation,

1mol. of H2 reacts with 1mol. of Cl2

then,

2.40mol. of H2 reacts with ----?mol of Cl2

[tex]=>2.40 mol. H2 * \frac{1mol. Cl2}{1mol. H2} \\=2.40 mol. Cl2[/tex]

So, the remaining moles of Cl2 is in excess.

The limiting reagent is--- H2.

1mol. of H2 releases --- 554kJ of energy

then,

2.40mol of H2 releases ---- ?

[tex]=>2.40mol * \frac{554kJ}{1 mol.} \\=1329.6kJ[/tex]

Answer is: deltaH =-1329.6kJ

Answer:

mass (g) needed = 710.2 grams Na₂SO₄(s)

Explanation:

Needed is 2.5 Liters of 2.0M Na₂SO₄; formula wt Na₂SO₄ = 142.04g/mol.

mass (grams) of Na₂SO₄(s) = Molarity needed x Volume needed in Liters x Formula Wt of solute

mass (grams) of Na₂SO₄(s) = (2.5L)(2.0M)(142.04g/mol) = 710.2 grams Na₂SO₄(s)

Mixing: Transfer 710.4 grams Na₂SO₄ into mixing vessel and add water-solvent up to but not to exceed 2.5 Liters total volume. Mix until dissolved.

Gives 2.5 Liters of 2.0M Na₂SO₄(aq) solution.

Answer:

Coke

Explanation:

A solid fuel formed by heating coal in the absence of air is coke. Coke is black colored, tough porous substance. It is pure carbon.

Answer:

c

Explanation:

it must absorb electrical energy

Answer:

With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion. ... With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly

Explanation:

Radhe Radhe❤

3.3256 Liters

See the image I have shared to you above

Answer:

B. 7.2k

Explanation:

took the test ;)

Sodium does not make up these proteins.

AMSWER IN THE ATTACHMENT.

Answer:

C. Compression

Explanation:

I'm pretty sure it's compression

Answer:

See explanation

Explanation:

Electroplating is a method used to coat a metal on top of another metal for various purposes.

Additive plating involves the coverage of a metal surface by another metal. To make the coins, the suspects had to coat the required coinage metal on another metal called the base metal so as to produce the coin.

Hence the method used must be additive plating method.

Answer:

504000 J

Explanation:

Applying,

Δq = cm(Δt)............. Equation 1

Where Δq = change in thermal energy, c = specific heat capacity of water,  m = mass of water, Δt = change in temperature.

From the question,

Given: m = 2 kg, Δt = 80-20 = 60°C

Constant; c = 4200 J/kg.°C

Substitute these values into equation 1

Δq = 2(4200)(60)

Δq = 504000 J

Hence the thermal energy is  504000 J

Answer:

B

Explanation:

Its the sum of the protons and neutrons.

Answer:

283.5g

Explanation:

first u need to know the molar mass of hno3 which is 63.01

the g=1.5×3×63.01

g= 283.5