The following reaction is done at stp:
n2 (g) + 3 h 2 (g) à 2 nh 3 (g)

if i.5 l of nitrogen gas are added to an excess of hydrogen gas, how many liters of nh3 gas will form?

The enthalpy change when 8.50 L of ozone at a pressure of 1.00 atm and 25°C reacts with 12.00 L of nitric oxide at the same initial pressure and temperature is -277.5 kJ/mol.

The enthalpy change when 8.50 L of ozone at a pressure of 1.00 atm and 25°C reacts with 12.00 L of nitric oxide at the same initial pressure and temperature can be calculated by the given equation. The balanced equation for the reaction is:2O3(g) + 2NO(g) → 2NO2(g) + 3O2(g)The enthalpy change for the given reaction can be determined using Hess’s law. Hess’s law states that the enthalpy change of a reaction is independent of the route taken, provided that the initial and final conditions are the same.

Since the given reaction can be expressed as a sum of a series of known reactions, Hess’s law can be used to calculate the enthalpy change.Using the given data, the enthalpy change for the reaction can be calculated as follows:δH° = 2 × [ΔH°f(NO2(g))] + 3 × [ΔH°f(O2(g))] - 2 × [ΔH°f(O3(g))] - 2 × [ΔH°f(NO(g))]δH° = 2 × [33.85 kJ/mol] + 3 × [0 kJ/mol] - 2 × [142.2 kJ/mol] - 2 × [90.4 kJ/mol]δH° = - 277.5 kJ/mol

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(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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Taking into account the definition of calorimetry and sensible heat, the heat added to the system is 331.2 cal.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this way, between heat and temperature there is a direct proportional relationship.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

Q= 0.23 \(\frac{cal}{gC}\)× 24 g× 60 C

Solving:

Q= 331.2 cal

In summary, the heat added to the system is 331.2 cal.

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Answer:

I think the answer is 4) 41

Explanation:

APE= atomic number, proton and the electrons are the same number

MAN= mass = atomic number - neutrons

121 - 80 = 41

i haven't done this in a while so hope this helps :)

The initial temperature of the water and copper is 22.51°C.

Mass of ice m = 14 g

We know, 1g = 0.001 kg

So, m= (14 x 0.001)kg = 0.014kg

Mass of water ml = 300g = (300 x 0.001)kg = 0.3kg

Mass of copper calorimeter m₂ = 200g = (200 × 0.001) kg = 0.21 kg

Specific heat of water s₁ = 4186 \(\frac{J}{kg . C}\)

Specific heat of ice s₂ = 2100 \(\frac{J}{kg.C}\)

Specific heat of copper s₃ = 387 \(\frac{J}{kg.C}\)

Latent heat of fusion of water L = 3.33 x 10⁵ \(\frac{J}{kg}\)

Initial temperature of ice T₁ = - 10°C

Initial temperature of water copper is T₂

Final temperature of the system is T = 18 °C

From equilibrium in heat

Heat gain by ice to become 0°C of ice +0°C of ice become 0 °C of water + 0°C of water become 18°C of water = heat loss by copper and water

 ms₂ (0°-(-10°)) + mL + ms₁ (T -0°) = m₁s₁ (T₂-18°) + m₂s₃ (T2 - 18°)

∴ 0.014 × 2100 × 10 + 0.014 × 3.33 × 10⁵+ 0.014 × 4186 × 18 = 0.3 × 4186 × (T₂- 18 ) + 0.2 × 387 × ( T₂ -18 )

∴ 6010.87 = 1333.2(T₂ - 18)

∴ T₂ - 18 = 6010.87 / 1333.2 = 4.51

∴ T₂ = ( 18 + 4.51 )

∴ T₂ = 22.51° C

So, the initial temperature of the water and copper is 22.51°C.

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Therefore, the solution to the system of equations is x = 11 and y = 20.  The equation that is the result of adding the two equations is 20x - 10y = 82.5 + 15 = 97.5.

To solve the system of equations 2. 5y 3x = 27 and 5x – 2. 5y = 5, we can use the method of elimination. We can eliminate the y variable by multiplying the first equation by 2.5 and the second equation by 3. This will give us:
12.5y - 7.5x = 67.5
15x - 7.5y = 15
Now we can add these two equations to eliminate the y variable and solve for x:
7.5x = 82.5
x = 11
To find the value of y, we can substitute x = 11 into one of the original equations. Let's use the second equation:
5(11) - 2.5y = 5
55 - 2.5y = 5
-2.5y = -50
y = 20

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The number of atoms present in 69.7 g nickel is 7.05 x 10²³ atoms.

Atoms are defined as the smallest unit into which the matter can be divided without the release of electrically charged particles.

It is also defined as a smallest unit that retain the properties of an element.  It is the building block of matter and were created by the big bang theory.

By using Avogadro number: 6.02 x 10²³ atoms are included in one mole of compound.

Mass of one mole of nickel = 58.69 g

So, 69.7 g of nickel = 6.02 x10²³ x 69.7 / 58.69

                                = 7.15 x 10²³ atoms.

Thus, the number of atoms present in 69.7 g nickel is 7.05 x 10²³ atoms.

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Answer:

10 g

Explanation:

Right from the start, just by inspecting the values given, you can say that the answer will be  

10 g

.

Now, here's what that is the case.

As you know, a substance's specific heat tells you how much heat is needed to increase the temperature of  

1 g

of that substance by  

1

∘

C

.

Water has a specific heat of approximately  

4.18

J

g

∘

C

. This tells you that in order to increase the temperature of  

1 g

of water by  

1

∘

C

, you need to provide  

4.18 J

of heat.

Now, how much heat would be required to increase the temperature of  

1 g

of water by  

10

∘

C

?

Well, you'd need  

4.18 J

to increase it by  

1

∘

C

, another  

4.18 J

to increase it by another  

1

∘

C

, and so on. This means that you'd need

4.18 J

×

10

=

41.8 J

to increase the temperature of  

1 g

of water by  

10

∘

C

.

Now look at the value given to you. If you need  

41.8 J

to increase the temperature of  

1 g

of water by  

10

∘

C

, what mass of water would require  

10

times as much heat to increase its temperature by  

10

∘

C

?

1 g

×

10

=

10 g

And that's your answer.

Mathematically, you can calculate this by using the equation

q

=

m

⋅

c

⋅

Δ

T

, where

q

- heat absorbed/lost

m

- the mass of the sample

c

- the specific heat of the substance

Δ

T

- the change in temperature, defined as final temperature minus initial temperature

Plug in your values to get

418

J

=

m

⋅

4.18

J

g

∘

C

⋅

(

20

−

10

)

∘

C

m

=

418

4.18

⋅

10

=

10 g

Answer:

Molarity of a solution = 1 mol / L

Explanation:

Given:

Amount of NaOH =20 g

Amount of water = 0.50 l

Find:

Molarity of a solution

Computation:

1 mol of NaOH = 40 g

So,

Moles of NaOH = 20 / 40 g = 0.50 mol NaOH

Molarity of a solution = moles of solute / Liters of solution

Molarity of a solution = 0.50 / 0.50

Molarity of a solution = 1 mol / L

The bond dissociation energy of O-H bond in a water molecule is 470 kJ/mole. So option c is the correct answer.

The bond dissociation energy of the O-H bond in a water molecule is a measure of the energy required to break the bond between the oxygen and hydrogen atoms in the molecule.

This value is typically expressed in units of kilojoules per mole (kJ/mole). In the case of water, the bond dissociation energy is relatively high at 470 kJ/mole, which means that a significant amount of energy is required to break the O-H bond in water.

So option c) 470 J/mole is the correct answer.

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When the 4.53 mol P will reacts with the 18.63 mol F₂, The number of the moles of the PF₅ is 4.53 mol.

The balanced chemical equation is as follows :

2P + 5F₂    →    2PF₅

The number of the moles = mass / molar mass

The moles of the P = 4.53 mol

The moles of the F₂ = 18.63 mol

It is clear from the balanced chemical equation is as :

1 mole of P  produce 2 mole of PF₅

The moles of the PF₅ = (2/2 ) × 4.53 mol

The moles of the PF₅ = 4.53 mol= (2/2 ) × 4.53 mol

The moles of the PF₅ = 4.53 mol

Thus, the mole of PF₅ = 4.35 mol

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Answer:

true.................

Answer:

Thermal energy that is transferred from one substance to another,moves from warmer to cooler objects. So True.

Explanation:

Answer:

Explanation:

Here, we want to know what happens to a solution that becomes more acidic

A lesser ph (1-7) indicates acidity with the acidity being higher as the number becomes smaller

What this means is that a solution with a pH of 3 is more acidic than a solution with a pH of 5

Thus, when the acidity increases, it is expected that the pH of the solution decreases (it becomes smaller in number)

The correct positions of the different molecular sizes within the column chromatography are as follows: Small molecules: Start,    Intermediate molecules: Middle, and    Large molecules: End

Chromatography is based on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase (stable phase) is separating from each other while moving with the aid of a mobile phase.

During the process of column chromatography, the different molecular sizes will settle at different positions. The small molecules are going to travel through the column at a much slower pace than the larger molecules. The three molecular sizes involved in the process of column chromatography are the following:

i) Small molecules

ii) Intermediate molecules

iii) Large molecules

Now, we have to place these molecules in their respective positions. The following is a drag and drop table which shows the positions of each molecule within the chromatography process:

Molecule size                      Position

Small molecule                         Start

Intermediate molecule           Middle

Large molecule                         End

Therefore, the correct positions of the different molecular sizes within the column chromatography are as follows:

Small molecules: Start      Intermediate molecules: Middle      Large molecules: End

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Answer:

1.8 x 10^ 24 atoms of oxygen

Explanation:

The molecular weight of ozone is known to be 48 grams / mol. Here we are given a sample of 48 grams of ozone as well, so in 48 grams of ozone the number of moles = 48 / 48 = 1,

_______________________________________________________

1 mole of ozone is equal to 6.0221415 × 10^23 molecules of ozone. Respectively, 1 molecule of ozone has 3 atoms of oxygen. Thus, you can conclude the following -

3 * 6.0221415 × 10^23 =  ( About ) 1.8 x 10^ 24 atoms of oxygen

Hope that helps!

The volume of 48 grams of ozone at room temperature and pressure (r.t.p) is equal to 24 \(dm^3\).

Given the following data:

Scientific data:

To determine the volume of 48 grams of ozone at room temperature and pressure (r.t.p):

First of all, we would calculate the number of moles of ozone contained in 48 grams of ozone by using the formula:

\(Number\;of\;moles = \frac{mass}{molar\;mass}\\\\Number\;of\;moles = \frac{48}{48}\)

Number of moles = 1.0 moles

By stoichiometry:

1 mole of ozone =  24 \(dm^3\)

Note: At room temperature and pressure (r.t.p), the volume of any gas is equal to 24 \(dm^3\) or 24,000 \(cm^3\).

In conclusion, the volume of 48 grams of ozone at room temperature and pressure (r.t.p) is equal to 24 \(dm^3\).

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Answer:

Mass = 0.008 g

Explanation:

Given data:

Volume of H₂ = 107 mL

Pressure = 104.8 KPa

Temperature = 30°C

Mass of H₂ present = ?

Solution:

Formula:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the units of temperature, pressure and volume.

Temperature  = 30+273 = 303 K

Volume of H₂ = 107 mL (107/1000= 0.107 L)

Pressure = 104.8 KPa (104.8/101 = 1.04 atm)

by putting values,

1.04 atm ×0.107 L = n× 0.0821 atm.L/ mol.K  × 303 K

0.11 atm.L  = n×24.87 atm.L/ mol

n =  0.11 atm.L / 24.87 atm.L/ mol

n = 0.004

Mass of H₂:

Mass = number of moles × molar mass

Mass =   0.004    mol × 2 g/mol

Mass = 0.008 g

We observe the same pattern as Ionic compounds are formed by electrically neutral cation-anion pairs. Ionic bonds hold together ionic compounds. They are named with the cation name first, then the anion name, with the word "ion" omitted.

The charge on cations is positive. They are made of metals on the periodic table's left side. The primary group of metals (Groups 1–8) form cations with a single, fixed charge. The charge corresponds to the periodic table's Group (column) number. After the element name, add the word "ion" to form the cation name.

Anions are charged negatively. They are composed of nonmetals, which are found on the periodic table's right side. Using the Octet Rule, the negative charge is found to be eight (8) minus the Group number. Anions have a single, fixed charge at all times. By changing the element name suffix to "-ide" and adding the word "ion" after the element name, the anion name is formed.

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Answer: Malleable, hard, good conductors of electricity

Explanation: metal can be shaped, its hard, and electricity moves freely through out the metal.

Answer:

good conductors of electricity, malleable, hard

Explanation:

i just took the test

Answer:

All molecules are made up of two or more atoms.

Explanation:

A molecule is made of atoms . The atoms may be of the same element or of different elements . That means a molecule must have at least two atoms . If it contains only one atom then it will not be called a molecule . Rather it will be called an atom. so

All molecules are made up of two or more atoms.

when 0.367 mol of a weak acid, hx, is dissolved in 2.00 l of aqueous solution, the ph of the resultant solution is 2.60. ka for hx is 3.405 × \(10^{-5}\)

Number of moles = 0.367

Volume of solution = 2l

concentration = 0.367/2 = 0.1835 mol/L

ph = 2.60

we know

ph = - log [H+]

2.51 × \(10^{-2.60}\)M = [H+]

The acid HX dissociate as

HX → H+   +  X-

The acid dissociation constant Ka, for the dissociation reaction is

Ka = [H+][X-]/[HX] ; at equilibrium, [H+] = [X-]

Ka = 3.405 × \(10^{-5}\)

A solution in which water serves as the solvent is called an aqueous solution. The most common way to represent it in chemical equations is to add (aq) to the appropriate chemical formula. For instance, the formula for a solution of table salt, or sodium chloride (NaCl), in water is Na+(aq) + Cl The word aqueous, which derives from the word aqua, means that something is connected to, resembles, or is dissolved in water. Water is a common solvent in chemistry because it is an excellent solvent and abundant in nature. Since water is frequently used as the experiment's solvent, unless otherwise stated, the term "solution" refers to an aqueous solution.

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Answer:

One of the purposes of the Marshall Plan was to aid nations in economic recovery from WWII.

Explanation:

The Marshall Plan aided the defeated Axis powers because that's one of the reasons it was created, The Marshall Plan was supposed to rehabilitate the economies of the 17 western and southern European countries in order to create stable conditions for democracy to continue.

Answer:

A

Explanation:

I used my resources and they was explaining and I came to a resolution that it was A

Answer:

A

Explanation:

like forces repel meaning that they should not be closer together, however if they are moved closer than electrical potenial energy withh increase because there is more force in the electric field

Answer:

Explanation:

16. 12

17. 8

18. 9

19. 10

20. 5

21. 15

22.8

23. 24

24. 12

25. 3 i guess( some one comment for 25th pls)

26. 2

The statement that condensation is vaporization that occurs at the surface of a liquid and can happen at nearly any temperature is False.

Condensation is the process by which a gas or vapor turns into a liquid. It is the opposite of vaporization, which is the process by which a liquid turns into a gas or vapor.

Vaporization can occur at any temperature, but condensation typically occurs when a gas or vapor is cooled below its dew point, which is the temperature at which the vapor begins to condense into a liquid. Condensation can also occur when the pressure on a gas or vapor is increased, forcing it to condense into a liquid.

So, condensation does not occur at nearly any temperature, but rather at temperatures below the dew point of the gas or vapor.

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The percent abundance of the Rb- 85 isotope is 79 % while the percentage abundance of Rb-87 is 21%.

We know that an atom has to be composed of isotopes. The isotopes of the elements are the atoms that do not have the same mass number but they do have the same atomic number. The reason why they do not have the same mass number is because they do not have the same number of neutrons present in the atom of the element.

Having said that, we now have to turn our attention to the atom of rubidium which is the atom that is under consideration here in this question. We have to write the relative abundance of Rb- 85 as x and that of Rb-87 as 1-x.

We now have;

85.427 = 85x + 87(1 - x)

85.427 = 85x + 87 - 87x

85.427  - 87 = 85x - 87x

-1.573 = -2x

x = 0.79 or 79%

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So,

Given the following reaction:

We want to find the number of moles of water that can be produced from the reaction of 2.0 moles of hydrogen gas is reacted with 2.5 moles of oxygen gas.

First of all, we need to check which of both reactants is the limiting reactant because that reactant is going to generate the product.

To find the limiting reactant, we're going to use the coefficients of the reaction. The equation tells us that per each two moles of H2, one mol of O2 is needed to react. So,

We have 2 moles of H2, but we need 5 moles of H2 to react according to the reaction.

Since we have less amount of what we really need, then, H2 is the limiting reactant.

Now, the moles of water produced will be:

The answer is 2 moles of H2O.

Answer:

C+O2=CO2

Explanation:

During combustion the reaction is formed.

Answer:

gas and liquid

Explanation: