How many mols of Cl₂ are needed to make 0.6 mols of NaCl according to the
following reaction?
2Na + Cl₂ --> 2NaCl

Isotopes of certain __radioactive__ elements that spontaneously emit __radiation__ and _rays___ from the __nuclei____

Any of multiple species of the same chemical element with differing masses whose nuclei are unstable and spontaneously produce radiation in the form of alpha, beta, and gamma rays are known as radioactive isotopes, also known as radioisotopes, radionuclides, or radioactive nuclides.

Learn more about Isotopes here:

https://brainly.com/question/14220416

#SPJ13

To calculate the molar mass of a compound, we need to find at the periodic table the atomic mass of each element that belongs to the compound and then we multiply for the quantity of atoms of it.

So, for:

5. K2Cr2O7:

K = 39 g/mol

Cr = 52 g/mol

O = 16 g/mol

(2x39) + (2x52) + (7x16) = 78 + 104 + 112 = 294 g/mol

Molar mass of K2Cr2O7 = 294 g/mol

6. C12H22O11

C = 12 g/mol

H = 1 g/mol

O = 16 g/mol

(12x12) + (22x1) + (11x16) = 144 + 22 + 176 = 342 g/mol

Molar mass of C12H22O11 = 342 g/mol

To solve this, we must know some terms:

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

Actual yield is already given = 7.64 moles

To obtain the theoretical yield, we use stoichiometry and proceed like this:

C3H8 + 5O2 => 3CO2 + 4H2O

1 mole C3H8 ------- 3 x 1 mole CO2

4.5 moles C3H8 ------ x

x = 13.5 moles

Therefore, our % yield:

% Yield = (7.64 moles/13.5 moles) x 100 = 57 % approximately

Answer: % yield = 57 %

The reaction presented to us is balanced since we have 4 aluminum atoms and 6 oxygen atoms on both sides of the reaction.

Now, we have a given mass of aluminum and oxygen, we must first determine the moles of each using their molar mass.

Moles of Al

Moles of O2

Now that we have the number of moles, we will calculate what the limiting reagent is, that is, the reagent that limits the reaction by its number of moles.

To find the limiting reactant we must compare the amount of product obtained with the given amount of reactant separately. The reactant that produces the least amount of product is the limiting reactant.

Using Al as limiting reactant

Using O2 as a limiting reactant

Aluminum is the reagent that produces the least amount of aluminum oxide, so the limiting reagent will be Al. And it will produce 0.785 moles of Al2O3. In grams this will be:

The percent yield will be:

The percent yield will be 8.33%

The strength is a measure of the degree of ionization of a substance in an aqueous solution.

Some substances are strong and they dissociate completely (this is the case of hydrochloric acid, HCl, in water), some are weak and they do not dissociate completely (like acetic acid, CH3COOH).

The concentration is a measure of the amount of the substance in a solution and it is usually explessed in moles or percentage. It is a ratio of the substance to the solvent. A concentrated solution is a solution with a high percentage of the substance (solute) in the solution, and a dilute one is a solution with a low percentage of solute.

There are 2.04*10^-4 moles of hydrogen.

To start the calculation it is necessary to use the molar mass of glycine:

- Glycine molar mass: 75.08 g/mol.

From the formula of glycine, we know that in 75.08g of glycine, there are 5 moles of hydrogen. So, in 3.06*10^-3g of glycine will be another amount of hydrogen, and we can calculate it with a mthematical Rule of Three:

So, there are 2.04*10^-4 moles of hydrogen in 3.06*10^-3g of glycine.

Answer

77.0 grams of CO are produced when 33.0 g of C reacts.

Explanation

Given:

Mass of C = 33.0 g

Equation: Fe₂O₃(s) + 3C(s) → 2Fe(s) + 3CO(g)

What to find;

The grams of CO that are produced when 33.0 g of C reacts.

Step-by-step solution:

Step 1: Convert 33.0 g of C to moles.

Using the formula for moles and the molar mass of C = 12.0 g/mol, the moles of C is

Step 2: Determine the moles of CO produced.

Using the mole ratio of C and CO from the balance equation and the moles of C in step 1; the moles of CO produced is calculated as follows:

Step 3: Convert the moles of CO produced to mass in grams.

The moles of CO produced in step above can be converted to mass in grams as shown below

Hence, 77.0 grams of CO are produced when 33.0 g of C reacts.

Answer:

C) 4Fe + 3O2 → 2Fe2O3

Explanation:

For this question, first you would go through all the options and make sure that there is an equal amount of elements on each side.

For the first option: 2Fe +02 → 2Fe2O3

You have only 2Fe atoms and 2O atoms on your reactant side and 4Fe and 6O atoms on your product side. This is not balanced.

For option b: 3Fe +302 → 3Fe2O3

You have 3Fe and 6O atoms on your reactant side while on your product side you have 6Fe and 6O atoms. This is not balanced.

For option c: 4Fe +302 → 2Fe2O3

You have 4Fe and 6O atoms on your reactant side and 4Fe and 6O atoms on your product side. This is balanced!

For option d: Fe +0₂ → Fe₂O3

You have 1Fe and 2O atoms on your reactant side and 2Fe and 3O atoms on your product side. This is not balanced.

***Remember to multiply the subscript of an element by their coefficient (number in front of molecule) if there is any.

Answer:

Explanation:

Here, we want to get the number of moles

Mathematically:

The number of moles in the question would be:

Ionization radiation is a type of energy with such a high value that it is capable of removing electrons from atoms and converting them into ions. This type of energy is extremely dangerous. The types of energy that fall into this category are X-rays and gamma rays.

So, the answer will be Gamma rays

A skeletal chemical equation is a representation of a chemical reaction using chemical formulae of reactants and products.

Sulfur = S

Oxygen = O

Sulfur dioxide = SO2

The skeleton equation is:

Here the skeleton equation = balanced equation.

Ca(NO3)2 and H₂O. Option C is correct

The combination of acid and base to form salt and water at the product is known as a neutralization reaction.

Hence the products of the neutralization reaction between HNO3 and Ca(OH)2 must be salt and water

From the given option, the equivalent product that are salt and water is Ca(NO3)2 and H₂O which gives the required product.

The wavelength in nm of light emitted when an electron transitions from n = 8 to n = 2 state is 38900nm.

It is given that the electron transition took place from n = 8 to n = 2. To find the wavelength, the following formula is to be used:

1/λ = R(1/n²₁ - 1/n²₂)

Here, n₁ = 2 n₂ = 8 and R = 109677. Therefore,

1/λ = 109677(1/2² - 1/8²)

1/λ = 109677(1/4 - 1/64)

1/λ = 109677((16-1)/64)

1/λ = 109677((15)/64)

1/λ = 0.234375 x 109677

1/λ = 25,705.5469

λ = 1/25,705.5469

λ = 3.89 x 10⁻⁵cm

λ = 38900 x 10⁻⁹m

λ = 38900nm

Therefore, the wavelength in nm from n=8 to n=2 transition is 38900nm

To know more about ground state and excited state, click below:

https://brainly.com/question/13752626

#SPJ1

Answer:

48 minutes

Explanation:

60 divided by 25 equals 2.4 then you times 2.4 by 20

A) 0.78 moles

B) 49.15grams

C) 1.73L

The formula for calculating the molarity of a solution is expressed as;

Given the following parameters

molarity of HNO3 = 1.3M

volume of HNO3 = 0.6L

A) moles of HNO3 = 1.3 * 0.6

moles of HNO3 = 0.78moles

B) Mass of HNO3 = moles * molar mass

Mass of HNO3 = 0.78 * 63.01

Mass of HNO3 = 49.15grams

There are 49.15grams of HNO3 present in 0.6L of the solution

C) According to dilution formula

Therefore the final volume of the solution will be 1.73L

1) Neutralization reaction.

In this type of reaction an acid and a base react to form a salt and water. In the course of the reaction H+ and OH- are produced. Afterward, they combine to produce water.

2) Example.

Acid: HCl

Base: NaOH

Salt: NaCl

answer and explanation

we are given initial values of temperature, pressure and volume as well as the final value of temperature and pressure and we are asked to find the final volume.

we can do this using the combined gas equation

P1V1/T1 = P2V2/T2

when we plug in the values we get:

(6atm x78L)/53K = (85atm x V2/17K

8.83 = 85atm x V2 / 17K

V2 = 1.77 Liters

Answer

NO is the limiting reactant

Explanation

Given that:

The mass of NH3 that reacted = 43.4 g

The mass of NO that reacted = 30 g

The equation for the reaction is: 4NH3 + 6NO --> 5N2 + 6H2O

What to find:

The limiting reactant.

Step-by-step solution:

The first step is to convert the given mass of the reactants to moles.

Using the mole formula and the molar masses of (NH3 = 17.0 g/mol and NO = 30.0 g/mol)

The final step is to determine the limiting reactant by comparing the mole ratio from the given equation with the mole ratio in the step above.

From the equation, 4 moles of NH3 reacted with 6 moles of NO

So 2.55 moles of NH3 is expected to react with (2.55 x 6)/4 = 3.825 moles of NO

1.0 mol NO is less than 3.825 mol NO, hence, NO is the limiting reactant because it will be the reactant to be completely used up first.

The specific heat capacity of the metal that needs 1495 J of heat to raise the temperature is 0.43J/g°C.

Specific heat capacity is the heat capacity per unit mass of a substance. It can be calculated by using the following formula:

Q = mc∆T

Where;

According to this question, 1495 J of heat is needed to raise the temperature of a 315 g sample of a metal from 55.0°C to 66.0°C. The specific heat capacity can be calculated as follows;

1495 = 315 × c × {66 - 55}

1495 = 3465c

c = 1495/3465

c = 0.43J/g°C

Therefore, 0.43J/g°C is the specific heat capacity of the metal that requires a heat of 1495J.

Learn more about specific heat capacity at: https://brainly.com/question/1747943

#SPJ1

Answer:1=B

2=A

Explanation:

Step 1 - "Reading" the equation

The given chemical equation is:

The bigger numbers, those that come before the formulas of the substances, indicate the quantity in moles of each substance required in this rection.

We can "read" this reaction thus as :

one mole of CH4 reacts with 2 moles of O2 thus producing one mole of CO2 and two moles of H2O

As the exercise is specifically asking about the proportion between O2 and CO2, we can further simplify this statement to:

two moles of O2 produce one mole of CO2

Step 2 - Obtaining the "recipe" for the reaction

In order to obtain a relation in grams, we need to multiply the number of moles of each substance by its respective molar mass. Let's remember that:

two moles of O2 produce one mole of CO2

Therefore, converting to grams (molar masses: 32 g/mol for O2; 44 g/mol for CO2)

We have now obtained the "recipe" for this reaction:

64g of O2 produce 44g of CO2

Pretty much as we would with a cake recipe, we can use this to predict how much CO2 is formed.

Since the reaction of two moles of O2 is exactly what we have already calculated, 44g of CO2 would be formed in this reaction.

Unstable atoms usually are very large atoms with a big nucleus, this configuration sometimes gives the atoms this unstable characteristic, which is why they decay so fast (some will decay in a matter of milliseconds), and radioactive decay is a way that atoms can find to become more stable, in this type of process, particles (alpha and beta decay) and energy (gamma decay), can be emitted from an atom in order to reach stability, therefore the best option is the 3rd option

According to the explanation given in the previous session, now we have hexane in an organic compound with the solubility of 0.520 g/mL at 25°C. We need to find the value of volume at 120.0 mg

1 gram = 1000 mg

120.0 mg = 0.12 grams

Now we can calculate the volume:

0.520g = 1 mL

0.12g = x mL

0.520x = 0.12

x = 0.12/0.520

x = 0.231 mL is the volume for this compound

Step 1 - Understanding percentual concentration

To express the concentration of a substance as a percentual concentration, we just need to divide its mass by the total mass:

Step 2 - Calculating the concentration in the pill

We want to calculate the concentration of Mg in the pill. Therefore, we'll divide its mass by the total mass of the pill:

Answer: the concentration of Mg in the pill is 6.8%

Answer

Density = 0.267 g/L

Explanation

Given:

Pressure of H2S = 0.2 atm

Temperature = 311 K

We know:

The molar mass of H2S = 34,1 g/mol

R constant = 0.08206 L.atm/K.mol

Solution:

From the ideal gas law:

PV = nRT

We know that:

density = m/V

n = m/M

Therefore we can use the following equation to solve for density of H2S

Since both metals are in the same group in the periodic table and both non-metals are also in the same group in the periodic table, they have the same charge (metals = 1+; non-metals = 1-). So this makes the reaction easier for us:

NaCl + LiBr = LiCl + NaBr

Green column - Alkaline earth metals

Red column - Alkali metals

Purple column - Lanthanides and actinides

Blue column - Transition metals

The red block are made up of group 1 elements and these elements are known as Alkali metals.

The green column are the group 2 elements in the periodic table and are known as the Alkali earth metals.

For the blue columns, they are element from group 3 to 10 and they are known as the transition metals.

For the purple column, they are Lanthanides and actinides

To find out how many significant numbers there are in a number we can rely on a few rules:

1. Non-zero digits are always significant

2. Any zeros between non-zero digits are significant

3. Final zeros or trailing zeros are significant if they come after the non-zero numbers in a decimal number situation

Example: .500 and .632000

In this question, we have:

0.0016/0.849 = 0.0019, this is the correct value with the correct number of significant figures

A)Nuclear fusion releases protons and neutrons, so the total number of protons and neutrons in a star changes throughout its life is the true statement.

A suggested method of producing energy would use heat from nuclear fusion processes to produce electricity. A heavier atomic nucleus is created by the fusion of two lighter ones, which also produces energy. Fusion reactors are devices created to use this energy.

Nuclear fusion is less risky than nuclear fission because the fuel rods produced by nuclear fission include dangerous radioactive waste that may be used in weapons and must be maintained carefully for thousands of years.

Powering the Sun and other stars are nuclear fusion processes. Two light nuclei combine to produce one heavy nucleus during a fusion process. The resultant single nucleus's total mass is less than the mass, which causes the process to release energy.

learn more about Nuclear fusion refer

https://brainly.com/question/17870368

#SPJ13

The heat absorbed or released by a substance is given by the following formula:

Where Q is the heat absorbed or released, m is the mass of the substance, Cp is the specific heat, T2 is the final temperature and T1 is the initial one.

We know the values of Q, m, T2 and T1 because they are given by the question statement, and we have to find the value of Cp.

Solve the equation for Cp and use the given values to find its value:

The specific heat of the substance is 0.49J/g°C.