How many grams of MgO are produced when 40.0 grams of O2 react completely with Mg? I picked B but I’m not sure if I’m correct

Answer:

5.546262 x 10^24 formula units

Explanation:

Use avogadro's number

9.21 mol CaO ((6.022 x 10^23 formula units CaO)/1 mol CaO)) = 5.546 x 10^24.

I rounded to 3 sig figs.

The mass of 0.0750 moles of calcium is 3.01g.

To calculate the mass of calcium we need to use the molar mass that we can find in the Periodic Table of Elements.

The molar mass of calcium is 40.1 g/mol.

Now, with a mathematical Rule of Three we can calculate the mass of calcium of 0.0750 moles:

So, the mass of 0.0750 moles of calcium is 3.01g.

The amount of heat, in kilojoules, that is required to melt 15 g of ice at 0 degrees Celsius and raise the temperature of the liquid to 85 degrees Celsius is 10.3178 kJ.

The process involves melting of ice at 0 degrees Celsius and then heating the resulting water to a temperature of 85 degrees Celsius.

Now, let's calculate the heat change of the process:

Heat change (ΔH) = n x heat of fusion) + mcΔt

Where n = number of moles

           m = mass = 15 g

           c = specific heat capacity of water = 4.81 J/g[tex]^oC[/tex]

           heat of fusion = 6010 J/mole

In this case, n = mass/molar mass

                       = 15/18

                       = 0.83 moles

ΔH = (0.83 x 6010) + 15 x 4.81 x (85 - 0)

      = 10317.8 Joules

But 1000 Joules = 1 kilojoules

Thus, 10317.8 joules = 10.3178 kJ

The kilojoule of heat required to melt the ice and raise the temperature of the resulting water to 85 degrees Celsius is 10.3178 kJ.

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Answer:

Explanation:

To write the Lewis structure, it is important to look for the electrons of each atom in the Periodic Table of Elements.

C has 4 valence atoms, H has 1 valence atom and Cl has 7 valence atoms.

We write the C atom in the center. Then we have to complete the Octet in each atom, except in Hydrogen, because it can only has 2 electrons bonded.

A. r: distance

B. q: charge

C. Fe: electric force

D. E: Electric field

So the answer is option C.

Answer:

Linear (180 degrees)

Explanation:

Whenever you have a triple bond between two atoms, their shape is linear. This is because the density of the triple bond between them is heavy, causing the other things attached to the atom to be as far away as possible, creating a linear structure.

CO2 particles move faster through the solution. Gas solubility increases as liquid CO2 partial pressure rises.

Dynamic equilibrium occurs when the solution rate matches the escape rate, and neither the gas above the liquid nor the gas dissolved in it changes.

This is further explained below.

Generally, The idea of partial pressure is connected to the changes that occur in soft drink containers. Since there are no gas particles in the liquid when we add CO2 at a typical partial pressure of 0.00035, the CO2 gas begins to move into the solution at a faster pace than it can leave.

But when the concentration of CO2 gas rises, it begins to diffuse into the liquid, and eventually, a dynamic equilibrium is attained when the rate of the solution equals the rate of escape.

However, as we continue to add CO2 to this dynamic equilibrium, its partial pressure will rise until it reaches 4 atm, and this rise in partial pressure accelerates the rate of solution. Thus, raising the partial pressure of CO2 causes this reversible transformation to occur.

When the rate of the solution equals the rate of escape, this is known as dynamic equilibrium, and neither the quantity of gas above the liquid nor the amount of gas dissolved in it changes in any significant way.

Now here comes what role is played by partial pressure. When the rate of solution and the rate of escape reach a dynamic equilibrium and we begin to introduce additional CO2 gas to this dynamic equilibrium stage.

The CO2 gas particle's partial pressure and concentration both rise. Because of the increased rate of collision between the surface of CO2 gas and the surface of the liquid particles due to the increasing concentration, the rate of solution also rises. The pace of solution has now surpassed the rate of escape.

As a result, the rate at which CO2 gas particles travel through the solution increases. This is how a rise in CO2 partial pressure over liquid causes a rise in gas solubility.

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0.02g/L

This question involves conversion of units and in this case, we are converting from g/ml to g/l.

1 g/ml = 1000 g/L

And we are given 0.020 g/ml to convert into g/L. The easiest way to do this is simply multiply 0.020 g/mL by 1000 to convert it into g/L

From the calculation above, 0.020g/ml is equivalent to 20g/L.

The correct statement about the description of ion whose symbol is Ca2+ among the choices above are:

The options b and d are correct.

It follows that elements whose charge on them are positive are called cations. In order words, in the periodic table of science of chemistry, the positively charged ions of elements are known as cations. Calcium has a positive of 2 on as it ion and this makes it a cation.

In addition to the above, calcium ion helps in signal transduction pathways of cells of living organisms. This goes to say that they also help in the body's normal functioning of the human body.

However, on a second note, calcium in the periodic table belongs to group 2, has a valence electrons of 2 and a metallic element; thereby making it a divalent metal.

In conclusion, we can now confirm from all said above that calcium above is a cation.

Complete question:

Check all of the following statements that are true about the ion whose symbol Ca2+

a. It is an anion

b. It is a cation

c. Its atoms is connected by tripple bonds

d. It is a divalent metal

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Answer:

A: 0

B: 0

Explanation:

Initially the concentration of Mg+2 ions and F- ions is zero. The ICE table is:

The first step to find the mass of the 8 moles of NH₃ is to find the molar mass of NH₃. The molar mass of any compound is the mass of one mol of it. To calculate it, we have to look for the atomic masses of the elements that the molecule has.

N: 14.01 amu

H: 1.01 amu

Then the molar mass of NH₃ will be:

molar mass of NH₃ = 14.01 + 3 * 1.01

molar mass of NH₃ = 17.04 g/mol

Now that we know the molar mass of NH₃ (the mass of one mol of it) we can easily find the mass of 8 moles.

mass = 8 moles of NH₃ * 17.04 g/mol = 136.32 g

mass = 136.32 g

Answer: the mass in grams of 8 moles of ammonia is 136.32 g

Answer:

Al 3+

Na+

Mg2+

F-

Explanation:

The element with the given electron that isn't an ion is Neon. It has 10 electrons in total.

Looking at the periodic table attached will help to see how the elements below are related to the one circled in red (Ne).

Al 3+ lacks 3 (because it has a 3+ charge) of its normal electrons so it has 10 and will have the same electron configuration as shown.

Na+ lacks one electron so it will also have 10 electrons instead of its normal 11.

Mg 2+ lacks two electrons so it will also have 10 total electrons.

F- has gained an extra electron so it now has 10 instead of 9.

Al3+, Na+, F-, and Mg2+ will have the given electronic configuration.

The electronic configuration given in the question is:

2p6, 2s2, 1s2

If it was a stable atom, the answer would have been Neon.

And if that would have been negative ion or anion (to be precise),

the answer would have been either F- or O2-.

But in the case of positive ions or we can say cations,

Al3+, Na+, and Mg2+ have the given electronic configurations.

Because the atom of Aluminum loses three electrons to achieve another state which is responsible for the formation of Al3+.

Similarly,

The atoms of Sodium and Magnesium also lose one and two electrons respectively to form Na+ and Mg2+.

So, we can conclude that Al3+, Na+, F- and Mg2+ will have the given electronic configuration.

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Explanation:

A mixture of differet iron oxides is heated and they it absorbs oxygen from the air to form iron (II) oxide. The reaction can be represented like this:

2 Fe₃O₄ + 2 FeO + O₂ ----> 4 Fe₂O₃

The mass of the mixture of Iron oxides is 3.939 g. The mass of Fe₂O₃ formed is greater than the original mass, it is 4.197 g. That means that the sample absorbed oxygen.

mass of Fe₃O₄ + mass of FeO = 3.939 g

mass of Fe₂O₃ = 4.197 g

The law of conservation of mass states that no mass is loss or created in a chemical reaction. A mass balance can be written:

mass of Fe₃O₄ + mass of FeO + mass of O₂ = mass of Fe₂O₃

The known values can be replaced in the equation, and it can be solved for mass of O₂ to obtain the answer to the problem.

mass of Fe₃O₄ + mass of FeO + mass of O₂ = mass of Fe₂O₃

mass of O₂ = mass of Fe₂O₃ - (mass of Fe₃O₄ + mass of FeO)

mass of O₂ = 4.197 g - 3.939 g

mass of O₂ = 0.258 g

Answer: the mass of oxygen reacted is 0.258 g

0.167L

In order to know how much L of the 3M NaOH solution would you need, we will simply set up an equal proportion solution expressed as;

C1 and C2 are the concentration of the solutions

V1 and V2 are the volumes of the solutions

Given the following parameters;

C1 = 1M

V1 = 500mL

C2 = 3M

V2 = ?

Substitute the given parameters into the formula above to get the required litre of solution needed.

Divide both sides by 3:

Converting to litres

Since 1mL = 0.001L

166.67mL = x

Cross multiply

Hence the amount of L of the 3M NaOH solution would you need is 0.167L

2 brome butane

it has 4 C atoms therefor we know it is a butan-- and the brome is placed in the second carbone so that gives the answer 2 brome butane

After one of the reactants has been totally consumed, the moles of HCl that have been produced is 20 moles.

The mole ratio of the reactants in the reaction is given below:

Equation of the reaction:

C₃H₈ + 4 Cl₂ --> C₃H₄Cl₄ + 4 HCl

The mole ratio of C₃H₈ and Cl₂  is 1 : 4

The mole ratio of the reactants, C₃H₈ and Cl₂  present is 6 : 20

mole ratio of the reactants, C₃H₈ and Cl₂  present is 3 : 10

Hence the limiting reactant is  Cl₂

Moles of HCl to  Cl₂  is 1  : 1.

Hence, the moles of HCl produced will be 20 moles

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Answer:

Ammonium hydroxide. Ammonium hydroxide is an inorganic herbicide, fungicide and microbiocide.It is non-volatile and highly soluble in water.

Explanation:

According to the concept of solubility, ammonium hydroxide is insoluble in water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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STP or Standard Pressure and Temperature is widely used when the subject is gases. The used standard temperature is 273 K or 0°C and the standard temperature used is 1 atm. At these conditions 1 mol will be equal to 22.4 L of volume, therefore if we have 11.2 L of Argon:

22.4 L = 1 mol

11.2 L = x moles of Argon

22.4x = 11.2 L

x = 0.500 moles of Ar will be present in 11.2 L of volume

Answer:

I do not know how to answer this question. Is it even a question?

Explanation:

How many molecules of carbon dioxide, CO₂, comprise 1.22 moles?

According to Avogadro's Number we have 6.02 * 10^23 molecules in one mol of molecules. So:

1 mol of CO₂ = 6.02 * 10^23 molecules of CO₂

Then:

1.22 moles of CO₂ * 6.02 * 10^23 molecules of CO₂ / 1 mol of CO₂ = 7.34 * 10^23 molecules of CO₂

There are 7.34 * 10^23 molecules of CO₂ in 1.22 moles of it

To solve this question we will use the integrated rate late law for first order reaction:

By substituting the values we have to determine the unknown we get:

Answer: Rate constant k is 6.392x10^-4 per min.

According to the stoichiometry, 4.85 g of propane is required to produce 14.7 g carbon dioxide.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given problem as per balanced equation of combustion of propane 2 molecules of propane produce  8 molecules of carbon dioxide.That is, 116.24 g of propane produces 352.08 g of carbon dioxide.

∴14.7 g of carbon dioxide is produced by, 14.7×116.24/352.08=4.85 g of propane.

Thus, 4.85 g of propane is required to produce 14.7 g of carbon dioxide.

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827.76 m/60.65 s = 13.65 m/s

685.5 mol/0.50 L = 1371 mol/L

20.9476 cm x 26 cm = 545 cm^2

When adding/subtracting

Use the least number of significant figures past the decimal point when adding or subtracting numbers.

When multiplying/dividing

Use the least number of significant figures present in any number in the problem when multiplying or dividing numbers.

The relative atomic mass of the given element is 40.372 amu.

The relative atomic mass of an element is considered as the sum of the isotopes masses each multiplied by the percentage which is found in nature.

The formula which is used to calculate the relative atomic mass is

Relative atomic mass = sum of all atomic masses of isotopes × fractional abundance

Given,

Mass of isotopes 1 = 19.19 amu

Mass of isotopes 2 = 20.99 amu

Mass of isotopes 3 = 21.99 amu

Fractional abundance of isotope 1 = 0.9092

Fractional abundance of isotope 2 = 0.0025

Fractional abundance of isotope 3 = 0.0883

By substituting all the values, we get

[( 19.19 × 0.9092) + (20.99 × 0.0025) + (21.99 × 0.883)]

= 17.447 + 0.052 + 22.873

= 40.372 amu.

Thus, we concluded that the relative atomic mass of the given element is 40.372 amu.

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They give us the reactions with their respective products and reactants. To balance a reaction we must bear in mind that matter is neither created nor destroyed, it only transforms. So the mass that we have in the reactants must be the same in the products. We verify this by counting the atoms of each element on each side of the reaction.

In the first reaction we have nitrogen and hydrogen. We have 2 nitrogens and 2 hydrogens in the reactants. We start off-balanced in nitrogen, so we place coefficient 2 in the NH3 molecule to get 2NH3. Now that we have 2 nitrogens and 6 hydrogens in the products, we must balance the hydrogen in the reactants. For that, we place the coefficient 3 in the H2 in such a way that there will be 6 hydrogen atoms in the reactants. The equation is balanced and will be:

We do this same procedure for the other two equations. We count the atoms, we put the coefficients so that the number of atoms is conserved and we count again until the number of atoms of each element is the same on each side of the reaction. For the other two reactions we have:

Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through  gap junctions.

Cytoplasm is the gelatinous liquid that fills the inside of a cell.

The cytoplasm is composed of water, salts, and various organic molecules. Some intracellular organelles, such the nucleus and mitochondria, are enclosed by membranes that separate them from the cytoplasm.

The cytoplasm has the following functions :

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Step 1

The reaction involved:

2 KClO3 => 2 KCl + 3 O2 (completed and balanced)

------------

Step 2

Data provided:

Mass of KClO3 = 163.27 g

---

Data needed:

The molar mass of:

KClO3) 122.6 g/mol

O2) 32.00 g/mol

-------------

Step 3

Procedure:

By stoichiometry,

2 KClO3 => 2 KCl + 3 O2

2 x 122.6 g KClO3 ------ 3 x 32.00 g O2

163.27 g KClO3 ------ X

X = 163.27 g KClO3 x 3 x 32.00 g O2/2 x 122.6 g KClO3

X = 63.92 g

Answer: 63.95 g (the nearest value)