given 2nan3 (s) --> 2na(s) 3n2 (g) if the reaction yields 21.1l of nitrogen gas what mass of nan3 in grams would be required to produce this volume at stp?

Answer:

6 valence electrons

Explanation:

The atom you have given is a sulfur atom. It has 6 valence electrons.

Answer:

33333333333333333333333

Mass of iron formed = 70.37g

To determine the mass of iron formed when 536 kJ of heat is released, we can follow these steps:

1. Calculate the moles of heat released per mole of reaction:
ΔH_rxn = -850 kJ for the balanced reaction: 2 Al (s) + Fe2O3 (s) → 2 Fe (s) + Al2O3 (s)

2. Determine the ratio of heat released to the heat of the reaction:
(536 kJ) / (-850 kJ) = -0.631

3. Since the ratio is negative, the reaction is exothermic, meaning heat is released. Now, find the moles of iron (Fe) produced using the stoichiometry of the reaction:
Since 2 moles of Fe are produced for every -850 kJ of heat released, we can set up a proportion:
(2 moles Fe) / (-850 kJ) = (x moles Fe) / (-536 kJ)
Solve for x moles of Fe:
x = (2 moles Fe) * (-536 kJ) / (-850 kJ) = 1.26 moles of Fe

4. Convert moles of Fe to mass using the molar mass of iron (Fe):
Molar mass of Fe = 55.85 g/mol
Mass of Fe = (1.26 moles Fe) * (55.85 g/mol) = 70.37 g

Therefore, when 536 kJ of heat are released, 70.37 g of iron (Fe) is formed.

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The size of the normal contact force of the road on the wheels compared with the weight of the car as "C)The normal contact force is less than the weight of the car."

The normal contact force on the wheels is less than the weight of the car. This is because it is given that the car is moving at a constant speed and the resultant force acting on the car is zero.

In such a case, the contact force between the road and the wheels is the force that propels the car forwards.  

Therefore, the force that propels the car forward should be relatively higher than the force of contact on the road. Only then motion could be observed.

Thus, the normal contact force acting on the car is less than the weight of the car so which could make the motion of the car possible.

Hence the correct option is C).

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The correct descriptions of a mole are:

a. Avogadro's number of items

b. 6.022 × \(10^2^3\) items

d. The amount of a substance containing the same number of formula units as there are atoms in 12 g of carbon.

a. Avogadro's number of items:

Avogadro's number is a fundamental constant in chemistry and is defined as the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. It is approximately equal to 6.022 × \(10^2^3\) items. Therefore, option a correctly describes a mole as Avogadro's number of items.

b. 6.022 × \(10^2^3\) items:

This is the numerical value of Avogadro's number. As mentioned earlier, it represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. So, option b is another correct description of a mole.

c. Mass multiplied by acceleration:

This description does not accurately describe a mole. The product of mass and acceleration is a measure of force (Newton's second law of motion) and is unrelated to the concept of a mole in chemistry.

d. The amount of a substance containing the same number of formula units as there are atoms in 12 g of carbon:

This is a correct description of a mole. It refers to the concept of the molar mass, where one mole of a substance contains the same number of particles (atoms, molecules, ions, etc.) as there are atoms in 12 grams of carbon-12. This concept allows for the conversion between mass (in grams) and the number of moles.

So, the correct options are a, b, and d.

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the percent error of the incorrect molar mass of nitroglycerin is 15.0% when compared to the correct molar mass.To calculate the percent error , we need to compare it to the correct molar mass and determine the deviation in terms of a percentage.

The correct molar mass of nitroglycerin (C3H5N3O9) can be calculated by summing the individual atomic masses of carbon, hydrogen, nitrogen, and oxygen in the compound:
3(12.01 g/mol) + 5(1.01 g/mol) + 3(14.01 g/mol) + 9(16.00 g/mol) = 227.08 g/mol

The incorrect molar mass calculated by the tired engineer is given as 192.9 g/mol.

To find the percent error, we can use the formula:
Percent Error = [(Correct Value - Incorrect Value) / Correct Value] x 100%

Percent Error = [(227.08 g/mol - 192.9 g/mol) / 227.08 g/mol] x 100%
Percent Error = (34.18 g/mol / 227.08 g/mol) x 100%
Percent Error = 0.1503 x 100%
Percent Error = 15.0%

Therefore, thethe percent error of the incorrect molar mass of nitroglycerin is 15.0% when compared to the correct molar mass.

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In the equation K = (W)(X)/(Y)(Z), the variables W, X, Y, and Z represent the molar concentrations of the reactants and products involved in the chemical reaction.

Specifically, W represents the molar concentration of the first reactant, X represents the molar concentration of the second reactant, Y represents the molar concentration of the first product, and Z represents the molar concentration of the second product.

The equation molarity = (mass solute / MW) / L solution is used to calculate the molar concentration of a solute in a solution. In this equation, "mass solute" refers to the mass of the solute dissolved in the solution, "MW" refers to the molecular weight of the solute, and "L solution" refers to the volume of the solution.

Note that while both equations involve concentrations, they are not directly related. The first equation is a thermodynamic expression of the equilibrium constant of a chemical reaction, while the second equation is used to calculate the concentration of a solute in a solution.

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According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;

where;

V1 and V2 are the initial and final volume of the gas

T1 and T2 are the initial and final temperatures of the gas (in Kelvin)

Given the following parameters:

Substitute the given parameters into the formula;

Therefore the volume of the gas at 20°C is approximately 97.67cm³

Answer:

2.016E24 same as 2.016 × 10^24

Explanation:

we have to use 2 conversion facts

22.4 and 6.02E23

1. Convert to moles of NH3 from liters of NH3

75.0 ÷ 22.4 = 3.348 moles of NH3

2. Convert to molecules of NH3 from moles of NH3

3.348 × 6.02E23 = 2.016E24 molecules of NH3

please let me know if i need to further eloborate :)

Sister chromatids is the term for the chromosomes that are identical after DNA replication.

Sister chromatids are identical chromosomes that are created during the process of DNA replication. DNA replication is the process where a DNA strand is copied, creating a new strand. During this process, each chromosome is split in half, forming two identical halves.

These halves are known as sister chromatids and are held together by a centromere. Sister chromatids are attached to one another during the interphase stage of the cell cycle and are separated during the metaphase stage of the cell cycle.

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Answer:

adenine, guanine, cytosine, thymine, and uracil

We need to know the molecular mass in order to determine the molecular formula from the empirical formula of a compound.

Molecular formula is formed from the actual number of elements that are involved in forming the molecule whereas empirical formula is the reduced ratio of the elements present in the compound.

We can determine the empirical formula of a substance by taking the subscripts of the molecular formula and reducing it to simplest whole number ratio.

we can calculate the molecular formula as:

n = molecular mass/ empirical formula mass

where n is any positive number.

Thus, when molecular mass is known , molecular formula can be determined form the empirical formula of a compound.

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Answer:

B. electrons and protons.

Explanation:

In an electrically neutral atom of any element, there are equal number of protons and electrons in the atom.

Protons are the positively charged particles in an atom.

Electrons are the negatively charged particles within the atom.

  When the number of protons and electrons are the same or equal, the atom is neutral.

But when there is an imbalance, an ion results.

Answer:

I think that temperature will be cut in half.

When volume increases, pressure decreases. As pressure decreases, temperature decreases. So if you double volume, pressure is halved and so will the temperature. I'm new to this, but I think that's the answer . Tell me if I'm right good luck!

Answer:

that is all I know sorry hope that may help you :)

Explanation:

Indicator is a substance which shows different colors in acidic and basic medium. Indicators can be natural (derived from natural sources) or artificial ( man-made) for example :

*Litmus is an indicator. Acid turns blue litmus into red while base turns red litmus into blue

* Turmeric solution does not show change in color (remains yellow) in acidic solution and turns red in basic solution.

The balanced redox equation in basic solution indicates that 3 electrons are transferred in the process described. The correct option is B.

To determine the number of electrons transferred in the given redox reaction, we need to balance the equation. The unbalanced equation is as follows:

Clo₄⁻(aq) + Fe(s) → Clo₃⁻(aq) + Fe³⁺(aq)

First, we balance the elements other than oxygen and hydrogen. In this case, we have one iron (Fe) atom on each side, so that is already balanced.

Next, we balance the oxygen atoms by adding water (H₂O) molecules to the appropriate side:

Clo₄⁻(aq) + Fe(s) → Clo₃⁻(aq) + Fe³⁺(aq) + H₂O

Now, we balance the hydrogen atoms by adding hydroxide ions (OH⁻) to the other side:

Clo₄⁻(aq) + Fe(s) + H₂O → Clo₃⁻(aq) + Fe³⁺(aq) + OH⁻

Finally, we balance the charges by adding electrons (e⁻) to the appropriate side. In this case, 3 electrons are required on the left side:

Clo₄⁻(aq) + 3e⁻ + Fe(s) + H₂O → Clo₃⁻(aq) + Fe³⁺(aq) + OH⁻

Now, we can see that 3 electrons are transferred in the balanced equation. Therefore, the answer is B. 3 electrons.

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Answer:

1.2M

Explanation:

Initial Volume 0.05L

Final Volume 0.250L

HCl Molar mass: 36.46 g/mol

M = 6M HCl

Molarity = mol solute /  L of solution

Inital M = Molarity = 6

mol solute = X = unknown

L of Solution = 0.05L

6 = X / 0.05

X = 0.3

X = 0.3/0.25

X = 1.2 M

​  

Explanation:

Trend of Atomic Radii in Periodic Table :

(Note : There are exceptions to above trend)

Answer:

Muscles and Bones?

Explanation:

Logic?

Answer: Thus the yield of uranium from 2.50 kg \(U_3O_8\) is 2.12 kg

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number \((6.023\times 10^{23})\) of particles.

To calculate the number of moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{molar mass}}\)

moles of \(U_3O_8=\frac{2.50\times 1000g}{842g/mol}=2.97mol\)    (1kg=1000g)

As 1 mole of \(U_3O_8\) contains = 3 moles of U

2.97 mole of \(U_3O_8\) contains = \(\frac{3}{1}\times 2.97=8.91moles\) moles of U

Mass of Uranium=\(moles\times {\text {Molar mass}}=8.91mol\times 238g/mol=2120g=2.12kg\)  

 ( 1kg=1000g)

Thus the yield of uranium from 2.50 kg \(U_3O_8\) is 2.12 kg

Answer:

hi

Explanation:

Answer:

It should be the same as the reactants. Because there is no loss or replacements.

Explanation:

Answer:

The same as the reactants

Explanation:

Answer:

1. false

2. true

3.true

4.true

Explanation:

Answer:

1. True

2. True

3. True

4. True

5. True

HOPE THIS HELPS

amount of mass in a given volume

Amount of mass in a given volume perfect describes the meaning of density. Hence option C is correct.

Density is the term used to describe the relation between the mass of the body and their volume. Density is a property that can be used to identify substances. Each substance has a unique density.

Example: wood ball density is less as compared to metal ball because wood ball is less than metal ball.

It describes how much matter is packed into a certain volume.

D = M/V

M =Mass (gram); V = Volume (ml or cm3); D = Density (gram/cm3)

Amount of mass in a given volume perfect describes the meaning of density. Hence option C is correct.

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Explanation:

pH is defined as the negative logarithm of the hydrogen ion or hydroxonium ion concentration of a solution. That is;

\( \bold{pH = -log([{H_3O}^{+}])} \)

From the question

\( [{H_3O}^{+}]\) = 2.5 × 10-⁷ M

\(pH = - log(2.5 \times {10}^{ - 7} ) \\ = 6.602\)

From the results the solution can be classified as acidic since it's pH is below 7 that's the neutral region

By combining 125.0 grams of Pb(SO4)2 with an excess of LiNO3, we will be able to make 145.5 grams of Li2SO4.

What is Stoichiometry ?

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. It involves the calculation of the amounts of reactants needed to produce a certain amount of product, or the amount of product that can be produced from a given amount of reactants.

To determine the amount of Li2SO4 produced, we need to use stoichiometry and balance the chemical equation for the reaction between Pb(SO4)2 and LiNO3:

Pb(SO4)2 + 2LiNO3 → Pb(NO3)2 + 2LiSO4

From the balanced equation, we can see that one mole of Pb(SO4)2 reacts with 2 moles of LiNO3 to produce 2 moles of LiSO4. Therefore, we need to convert the mass of Pb(SO4)2 given to moles, and then use the mole ratio to calculate the amount of Li2SO4 produced.

125.0 g Pb(SO4)2 × 1 mol Pb(SO4)2 / Pb(SO4)2 molar mass = 0.404 mol Pb(SO4)2

Next, we use the mole ratio between Pb(SO4)2 and Li2SO4 to calculate the number of moles of Li2SO4 produced:

0.404 mol Pb(SO4)2 × 2 mol LiSO4 / 1 mol Pb(SO4)2 = 0.808 mol Li2SO4

Finally, we convert the number of moles of Li2SO4 to grams:

0.808 mol Li2SO4 × Li2SO4 molar mass = 145.5 g Li2SO4

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Answer: The sun heats earth’s oceans causing convection currents to travel from the equator to the poles

Explanation: found it on a quizz thingy :D

The following is most responsible for the occurrence is the sun heats earth’s oceans causing convection currents to travel from the equator to the poles. Hence option A is correct.

Current is defined as a movement of electrical charge carriers, most frequently electrons or atoms deficient in electrons. Electric current is a term used to describe how much electricity flows across a circuit and how it flows in an electronic circuit. Three elements are required to create an electric current: a supply of freely flowing electric charges (electrons), some kind of push to move the charges across the circuit, and a path to carry the charges.

Convection current is defined as a procedure when energy is transferred from one location to another. It is also known as heat transfer by convection. Plate tectonics is fueled by magma convection currents. Magma is produced by the heat produced by the radioactive decay of materials in the Earth's interior.

Thus, the following is most responsible for the occurrence is the sun heats earth’s oceans causing convection currents to travel from the equator to the poles. Hence option A is correct.

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A compound forms a dense yellow precipitate when treated with iodine and sodium hydroxide. the compound must be: Acetophenone methyl ketone.

Sodium hydroxide is every now and then known as caustic soda or lye. it's by far a common ingredient in cleaners and soaps. At room temperature, sodium hydroxide is white, odorless strong. Liquid sodium hydroxide is colorless and has no odor. it could react violently with strong acids and with water.

Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. it is a white stable ionic compound that includes sodium cations Na⁺ and hydroxide anions OH⁻.

Manufacturers may additionally use sodium hydroxide to provide soaps, rayon, paper, products that explode, dyes, and petroleum merchandise. different obligations which can use sodium hydroxide include processing cotton cloth, steel cleaning and processing, oxide coating, electroplating, and electrolytic extraction.

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The units of the rate constant are \(M^-^1s^-^1.\)

The overall order of a reaction is the sum of the orders of the reactants in the rate law. For a reaction with an overall order of 2, the rate law has the form:

rate =\(k[A]^m[B]^n\)

where k is the rate constant, A and B are reactants, and m and n are the orders of A and B, respectively. Since the overall order is 2, we have m + n = 2.

The units of the rate constant depend on the overall order of the reaction and the units of the concentration of the reactants. For a second-order reaction, the units of the rate constant are:

k = \(M^-^1s^-^1\)

This can be derived from the rate law:

rate = \(k[A]^2\)

where the units of rate are M/s and the units of [A] are M. Substituting the units, we get:

M/s = (M-1s-1) ×\(M^2\)

Simplifying, we get:

M/s =\(M^3s^-^1\)

Dividing by\(M^2\), we get:

1/s =\(M^-^1s^-^1\)

Therefore, the units of the rate constant are\(M^-^1s^-^1\).

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