what element is this ​

(a) Therefore the limiting reagent is N2.

(b) The kilograms of excess reagent left = 0.5709 kg.

(c) % Yield = 89.475 %.

Given reaction is

N2(g) + 3H2(g) ------> 2NH3(g)

mass of N2=18.2 kg=18.2 x 103 g (Since 1 kg=1000 g)

Molar mass of N2=28.0134 g/mol

Moles of N2=mass/molar

mass = (18.2 x 103 g)/(28.0134 g/mol) = 649.689 mol.

the mass of H2 = 4.5 kg = 4.5 x 103 g = 4500 g

The molar mass of H2 = 2.01588 g/mol

Moles of H2 = (4.5 x 103 g )/(2.01588 g/mol) = 2232.276 mol.

As per the balanced equation, the mole ratio between N2:H2 = 1:3.

But here N2:H2 = 649.689: 2232.276  = 1:3.436

That means H2 is in excess.

(a) Therefore the limiting reagent is N2.

(b) The actual moles of H2 required = 3 x mol of N2 used = 3 x 649.689 mol = 1949.067 mol.

Mass of H2 required = moles x molar mass = 1949.067 mol x 2.01588 g/mol = 3929.085 g.

The excess mass of H2 present = 4500 g - 3929.085 g = 570.91 g = 0.5709 kg.

The kilograms of excess reagent left = 0.5709 kg.

(c) The theoretical yield of NH3 = 2x moles of N2 used = 2 x 649.689 mol = 1299.378 mol.

The molar mass of NH3 = 17.03052 g/mol

Therefore theoretical yield of NH3 =moles x molar mass = 1299.378 mol x 17.03052 g/mol = 22129.08 g

Theoretical yield of NH3 =22.129 kg

Given the experimental yield of NH3 = 19.8 kg.

Therefore,

% Yield = (Experimental yield)/(Theoretical yield ) x 100

% Yield=(19.8 kg/22.129 kg) x 100=89.475 %.

% Yield=89.475 %.

Reagent or analytical reagent is a substance or compound that is added to a system to produce or test a chemical reaction as it occurs. The terms reactant and reactant are not often used interchangeably, but a reactant defines a substance that is used up in  a chemical reaction.

H2 (hydrogen gas) and O2 (oxygen gas) are reactants in the reaction that forms liquid water: 2 H2(g) + O2(g) → 2 H2O(l).

Note that mass is conserved in this equation. There are four hydrogen atoms and two oxygen atoms on the original and multiplicative sides of the equation.

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Answer:

Your coefficients (the numbers in front of the molecule) will be the following from left to right.

1. 1 - 2 - 1 - 2

2. 2 - 1 - 2 - 2 - 1

3. 2 - 4 - 1

4. 2 - 4 - 3

5. 2 - 2 - 2 - 1

6. 1 - 1 - 1

7. 2 - 1 - 2

8. 3 - 1 - 2 - 3

9. 3 - 1 - 2 - 3

10. 2 - 1 - 1 - 1

Explanation:

To balance this equations first count how many times an element is on each side and then see what needs to be changed in order to balance them.

A 3.75 g piece of gold, initially at 587.15 K, is dropped into 20.6 mL of 295.75 K water. The final temperature is 291.4 K.

Temperature is defined as a measure of hotness or coldness expressed on any of several arbitrary scales and indicating the direction in which heat energy will spontaneously flow that is, from a hotter to a colder body.

To calculate the final temperature

ΔT = T1 - T2

Where T1 = 587.15 K

           T2 = 295.75 K

ΔT = 587.15 - 295.75

ΔT = 291.4 K

Heat capacity of gold is

q = mcΔT

q = 3.75 x 0.129 x 291.4

q = 140.96 J

Thus, a 3.75 g piece of gold, initially at 587.15 K, is dropped into 20.6 mL of 295.75 K water. The final temperature is 291.4 K.

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The equation of the enthalpy of the formation of water is:

H₂O (g) + ¹/₂ O₂ (g)----> H₂O (g)

The enthalpy change for the formation of water refers to the heat changes that occur when a mole of water is formed from its constituent elements.

The equation for the formation of water is given below:

2 H₂O (g) + O₂ (g)----> 2 H₂O (g)

The enthalpy of the formation of water, ΔHf, is -249 kJ.

A water molecule s formed from the hydrogen gas and oxygen gas reacting with a mole ratio of 2 : 1.

The reaction of the formation of water is an exothermic reaction, hence, the enthalpy of the formation of water, ΔHf, has a negative value.

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Answer

The model which best represents a molecule of hydrogen peroxide (H2O2) is option B.

The electromagnetic spectrum shown in the diagram is describing radiant energy.

The electromagnetic spectrum shows the total range of frequencies or wavelengths that electromagnetic radiation covers or occurs.

The electromagnetic spectrum usually arranges all forms of electromagnetic radiation from that having the shortest wavelength or highest frequency to that having the longest wavelength or lowest frequency or vice versa.

The electromagnetic spectrum shown arranges electromagnetic radiation from gamma rays to radio waves.

All forms of electromagnetic radiation possess radiant energy.

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Yes, it will be harder to get the strong magnets to change phase​ because the molecules are tightly packed together.

This is referred to as a material which has the ability to produce its own magnetic field and consists of north and south poles. It is usually made from substances such as iron and is usually hard.

In a magnet, the like poles repel and the unlike poles attract and in this scenario, it will be harder to get the strong magnet to 'change phase' as a result of the atomic structure of the substances involved.

They are in the form of solids, which means that there is very little or no space between the atoms. This translates to a higher force of attraction and strong bonding thereby making it the most appropriate choice.

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Answer: 1 mL = 1 cm^3

Explanation:

This is a common conversion, 1 mL equals 1 cm^3. They are the same volume.

Volume of the sample of neon gas is 8.48L

Volume can be calculated by multiplying mole of gas with molar gas volume and the neon gas is the inert gas which is present in group 18 of the periodic table used in electric sign and florecent lamp

Here given data is 0.379 mol of neon gas at STP

Formula to calculate volume

Volume = n×Vm

Where n = number of moles

Vm = molar gas of volume at STP

Put the given value in the formula then

V =  0.379 mol × 22.4L/mol

V = 8.48L

Volume of the sample of neon gas is 8.48L

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      We produce trash. Every time we produce something, waste is typically produced. That trash was referred to by Dr. Seuss as "Gluppity Glup" and "Schloppity-Schlopp." Whatever we choose to call it, waste can become a problem if it isn't handled appropriately.

We produce trash. Every time we produce something, waste is typically produced. That trash was referred to by Dr. Seuss as "Gluppity Glup" and "Schloppity-Schlopp." Whatever we choose to call it, waste can become a problem if it isn't handled appropriately.

   Using the literary device of personification to create relatable characters for industry (as the Once-ler), the environment (as the Truffula trees), and environmental activism, the tale is widely regarded as a fable on the danger of avarice causing human damage of the natural environment.

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Decreasing the temperature in the reaction vessel keep this reaction from shifting to form more of the product.

As we know that rate of reaction is directly proportional to the concentration of the reactant.

If we increase the concentration of H2 then the rate of reaction increases. So, we keep it constant. Therefore this option is wrong.

By removing the H₂O from the reaction vessel as it almost make no change in the reaction. This can be pursuited the reaction in which product again converted into product.

By increasing the temperature we increases the rate of reaction and equilibrium shift in the forward direction.

Thus, we concluded that by decreasing the temperature in the reaction vessel keep this reaction from shifting to form more of the product.

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The calculated concentration of the acetic acid neutralized is 0.134 M.

In this case, the task that we have is to obtain by calculation what would be the concentration of the acetic acid that is need to neutralize  0.1098M of sodium hydroxide solution.

Given that;

Total volume of the vinegar = 5 ml + 25 mL = 30 mL

Molarity of the sodium hydroxide =  0.1098M

Volume used for neutralization = 37.83ml -  1.35 ml = 36.48 mL

Applying the relation;

CAVA/CVB = NA/VB

CAVANB = CBVBNA

CA= CBVBNA/VANB

CA = 0.1098 * 36.48  * 1/30 * 1

CA = 0.134 M

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The elements cycle through the atmosphere is biogeochemical cycle. In atmosphere different types of cycle are revolving around.

The biogeochemical cycle is refer to the exchange of substances between biotic and abiotic sources.  

It can also be defined as the process by which a chemical material circulates through Earth's biotic and abiotic regions.

There are six types of biogeochemical cycle.

Thus, the elements cycle through the atmosphere is biogeochemical cycle. In atmosphere different types of cycle are revolving around.

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When the concentrations of Ca2+ and F- are 0.002M and 0.004M, respectively, the solubility constant will be 3.2x [tex]10^{-8}[/tex].

The amount of solute that has been dissolved in a specific volume of solvent or solution is measured by the solution's concentration. A solution that contains a significant amount of dissolved solute is said to be concentrated.

You can determine how much solute has been dissolved in the solvent by looking at the concentration of the solution. For instance, the concentration could be stated as 1 teaspoon of salt per 2 cups of water if you add 1 teaspoon to 2 cups of water.

Given that,CaF2(s) <==> Ca 2+(aq) + 2F- (aq)

Solubility constant(Ksp) is written as

Ksp = [tex][Ca^{2+} ][F-]^{2}[/tex]

Ksp = [tex][0.002][0.0004]^{2}[/tex]

Ksp = 3.2x[tex]10^{-8}[/tex]

So, the Solubility constant is 3.2x[tex]10^{-8}[/tex].

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• We need to take into consideration that many factors lead to variations from the ideal bond angles of a molecular shape. Size of the atoms involved, presence of lone pairs, multiple bonds, large groups attached to the central atom,

• In this instance,, Option 2,3,4, are applicable in order to cause bond angles to differ between molecules.

ANSWER

STEP-BY-BY STEP EXPLANATION:

Given equation

To balance the above equation, we will need to apply the law of conservation of mass

The next process is to assign variables to each of the reactants and products

For carbon

we have 1 carbon atom at the reactant side and 1 carbon atom on the product side

Mathematically

a = c

For Fluorine

We have 4 atoms of fluorine at the reactant side and 2 atoms of fluorine at the product side

4a = 2d

For Bromine

we have 2 atoms of bromine on the reactant side and 4 bromine atoms on the product side.

2b = 4c

Since a = c

Therefore, a = 1 and c = 1

2b = 4c

Recall that, c = 1

2b = 4

Divide both sides by 2

2b/2 = 4/2

b = 2

we also know that, 4a = 2d

a = 1

4(1) = 2d

4 = 2d

Divide both sides by 2

4/2 = 2d/2

d = 2

Therefore,

a = 1

b = 2

c = 1

d = 2

We can see from that the limiting reactant from the question is carbon.

The limiting reactant is the reactant that would determine when the reaction would stop. This is so because that reactant is present in the least amount in the system.

Given that;

Number of moles of carbon = 20.0g/ 12.01 g/mol = 1.67 moles

Number of moles of hydrogen =  20.0g/2.02 g/mol = 9.9 moles

Given that 2 moles of carbon reacts with 3 moles of hydrogen

1.67 moles of carbon reacts with;  1.67 moles  * 3 moles / 2 moles

= 2.51 moles

Hence the limiting reactant is carbon.

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In electrolysis, the anode is positively charged while cathode is negatively charged

So, Cu2+ moves towards the negative electrode which is cathode

while SO42- moves towards anode

Since cathode(being negatively charged) rich in electrons, Cu2+ gains 2 electrons and sticks to the electrode and becomes Cu (solid form)

While, on anode, SO42- should go to loose electrons but this doesnt happen as it requires lot of energy to do that (overvoltage)

Instead, anode (which is itself made of Cu) starts loosing electrons and starts dissolving to release Cu2+ ions (as this process will require less energy)

So, in the electrolysis of CuSo4 using Cu electrodes,

Cathode reaction: Cu2+ + 2 e ---> Cu

Anode reaction: Cu ---> Cu2+ + 2e

Answer

Explanation

Given:

Mass of iron (III) oxide sample = 74 g

What to find:

The amount (mole) of iron (III) oxide in a 74 g sample.

Solution:

The amount (mole) of iron (III) oxide in a 74 g sample can be calculated using the mole formula.

Using the molar masses of Fe = 55.845 g/mol, and O = 15.999 g/mol.

The molar mass of Fe2O3 = (2 x 55.845) + (3 x 15.999) = 159.687 g/mol

Putting mass = 74 g and molar mass = 159.687 g/mol, the amount will be

Therefore, the amount of iron (III) oxide in a 74 g sample is approximately 0.46 moles.

From the images, the gas 2 has a greater pressure compared to gas 1 because it has more particles that are colliding.

The term pressure of a gas refers to the force with which the gas hits the walls of the container. We know that the pressure of the gas depends on the number of the molecules of the gas. According to one of the gas law, the pressure of the gas is directly proportional to the number of moles of the gas.

We now have to look at the image properly. It is clear that the image that is on the right hand side has more gas molecules thus it has a greater pressure compared to the gas on the left hand side.

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Explanation:

The reaction between potassium (K) and bromine (Br2) produces potassium bromide (KBr).

K + Br2 --> KBr

Now we need to balance the equation. For this, we need to equate the atoms of each element on both sides of the equation.

So in the reactants side:

K - 1

Br - 2

Products side:

K - 1

Br - 1

Let's multiply KBr by 2:

K(s) + Br2 → 2KBr(s)

Now we need to balance K:

2K(s) + Br2 → 2KBr(s)

Let's count again:

Reactants side:

K - 2

Br - 2

Product side:

K - 2

Br - 2

2K(S) + Br2 → 2KBr(S)

Answer: 2K(s) + Br2 → 2KBr(s)

The percent of copper in solution is 39.8% when a solution contains copper and suphate.

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The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.

The law of conservation of mass states that in a chemical reaction the mass neither be created nor be destroyed.

for example :

CH₄   +    2O₂    ----->    CO₂   +   2H₂O

the mass of reactants is = 16 g + 64 g = 80 g

the mass of products is = 44 g + 36 g = 80 g

it is clear from the above that :

The mass of reactants = The mass of Products

Thus , The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.

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   The ability to exert a force that causes an item to move is what is meant by the definition of energy as the "power to accomplish work." Even though the definition is unclear, the meaning is clear: energy is simply the force that moves things.

   Following is the order of energy needed for excitation of various transitions. Transition n* uses the least energy, whereas transition * uses the most energy. Since the n* transition has a larger wavelength, it takes the least energy.

      A periodic table can be used to predict electron configurations. The least energetic and most stable configuration is the ground state configuration. A higher energy configuration is called an excited state configuration (it requires energy input to create an excited state). The electrons used in bonds are valence electrons.

     An electron receives and releases energy in the form of light energy during transition. The energy change E Delta E E of the electron is equal to the energy of the photon E E E absorbed/released during the transition.

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Answer

Mendeleev predicted the properties of undicovered elements such as Germanium. He ddeuced based on the gaps in the periodic tbl

Answer:

Explanation:

Here, we want to get the mass of carbon (iv) oxide produced

We start by writing the equation of reaction as follows:

Now, we need to get the mass of propane that reacted

We can get that by multiplying the density of propane by its given volume

Mathematically, we have that as:

From here, we get the actual number of moles of propane that reacted

We can get that by dividing the mass by the molar mass of propane

The molar mass of propane is 44 g/mol

The number of moles is thus:

From the balanced equation:

1 mole of propane gave 3 moles of carbon (iv) oxide

104/44 mol will give x moles

We have the value of x as:

To get the mass of carbon (iv) oxide produced, we multiply the number of moles above by the molar mass of carbon (iv) oxide

The molar mass of carbon (iv) oxide is 44 g/mol

Thus, we have the mass as:

Answer:

C. Strong nuclear force.

Explanation:

First, let's review the definitions of the given concepts of the group of answer choices:

- Electrostatic force: It's the interaction that occurs between electrically charged particles (positive and negative charges).

- Force of gravity: is a fundamental interaction where there is a mutual attraction between all things that have mass or energy.

- Strong nuclear force: is what keeps nuclei together (protons and neutrons together).

- Weak nuclear force: this force is responsible for particle decay.

Based on these definitions, the force that holds the nucleus together would be C. Strong nuclear force.

According to the explanation given in a previous session, now we have to use the same molarity formula to find the number of moles of CaCl2, let's set up the formula and add the values:

M = n/V

4.9 = n/0.750

n = 4.9*0.750

n = 3.675 moles of CaCl2

Now to find the mass in grams, we need both the number of moles, 3.675 moles, and also the molar mass of CaCl2, which is, 110.98g/mol

110.98g = 1 mol

x grams = 3.675 moles

x = 407.85 grams of CaCl2