Please help with this question. At first i chose the second answer but it’s wrong.

Answer:

52.12%

Explanation:

First you need to find the mass of the total molecule. The mass of one atom of Fe is 55.847. The mass of one atom of Cl is 35.453. The mass of O is 16.00, and the mass of H is 1.00. The mass of the whole atom is calculated as follows:

55.847 + 3(35.453) + 6(16.00)+ 12(1.00) = 270.206.

Next calculate the mass of water in the molecule:

(2)1.00 + 16.00 = 18.00(6 molecules) = 108

Finally, divide the mass of water by the mass of the whole molecule and multiply by 100 to get it as a percent:

108/207.206 = 0.52122 x 100 = 52.12%

Answer:

So a compound is 52% Zinc(Zn), 9.6% Carbon(C), and 38.4% Oxygen (O). Let’s first start off by assuming that we have 100 g of this compound. This means that we have 52 g of Zinc, 9.6 g of Carbon, and 38.4 g of Oxygen.Zinc = 65.38 g/molCarbon = 12 g/molOxygen = 16 g/molThis means we have:52 g of Zn(1 mol Zn/65.38 g of Zn) ≈0.8 mol of Zn.9.6 g of C(1 mol C/12 g of C) = 0.8 mol of C38.4 g of O(1 mol of O/16 g of O) = 2.4 mol of O.

Explanation:

What we want to do next is divide each element by the common factor of all of them, which is 0.8. In most cases, you divide each element by the element with the least amount of moles. After we divide each by 0.8, you’ll notice you have 1 Zn, 1 C, and 3 O. This gives you the empirical formula of ZnCO3, or Zinc Carbonate.

Answer:

B. The emiision spectrum of an element

Explanation:

just took the test

Answer:

b

Explanation:

Answer:

nitrogen, oxygen, and fluorine.

Explanation:

Hydrogen bonding occurs where hydrogen is bound to STRONGLY electronegative elements, viz. nitrogen, oxygen, and fluorine. Explanation: See this answer. You should also compare the boiling points of N H 3, OH 2, and H F, with the hydrides of the lower Group. i.e. P H 3,SH 2 etc.

Answer:

Hydrogen forms bonds with Nitrogen, Oxygen and Fluorine.

Explanation:

Hydrogen bonding occurs only in molecules where hydrogen is covalently bonded to one of the above three elements.

we know that,

AᵣH = (Sum of enthalpies of products)-(Sum of enthalpies of reactants)

AᵣH = 55kJ - 30 kJ

AᵣH = 25kJ

or

AᵣH =( Activation Energy-Reactant energy) +( Activation Energy-product energy)

AᵣH =(65kJ -30kJ) +(65kJ-55kJ)

AᵣH = 35kJ - 10kJ

AᵣH = 25kJ

Answer:

B. 25 kj

Explanation:

Products-reactants

I took the exam

Answer:

I think its D.!!

Explanation:

Electromagnetic waves such as radio waves are used in information transmission either as digital or analogy signals.

Electromagnetic waves are waves which are produced from the interactionof the electric and magnetic fields.

Transmitting data at lower frequencies enables the waves to travel longer distances than at higher frequencies, therefore scientists usually transmit data at a lower frequencies.

The limitations of transmitting information using electromagnetic waves include a limited number of broadcast frequencies and interference of waves.

Analog signals differ from digital signals in that analog signals have continuous electrical signals while digital signals have non-continuous electrical signals.

Digital signals over analog signals is that it transmits more information per second than analog signals Analog and digital signals are employed in mobile devices, television, radio, computers and the internet

A radio telescope is used to receive radio waves from astronomical radio sources in space.

It has several parts such as a dish and antenna,a receiver,a detector and an analyzer. The dish collects and focuses radio signals on the antenna and the information is processed by the receiver, detector and analyzer.

Radios waves are used for the transmission of radio and television signals.

Radio telescopes convert radio waves which are analog signals to electrical signals wgich are digital siagnals because it can be easily stored and transmitted in digital form.

Therefore, electromagnetic waves such as radio waves are used in information transmission.

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The Atomic Number indicates the number of protons = 56

Answer:

Dynamic equilibrium only occurs in reversible reactions, and it’s when the rate of the forward reaction is equal to the rate of the reverse reaction.

Explanation:

Does this answer your question?

Method 1: gravimetry

advantages: Impurities in the sample can be identified

disadvantages: The process is long, because it goes through several stages

Method 2: titration

advantages: the process is fast, because the titrate and titrant react immediately

disadvantages: Sometimes the determination of the end point of the titration is carried out too fast or too slowly so that the calculations carried out are inaccurate

b) Microwaves, Visible light, X rays, Gamma rays

Answer:

the speed of light travels much faster than the speed of sound.

Answer:

20ml

Explanation:

using the formula;C1V1=C2V2

2.5×V1=0.2×250

2.5V1= 50

V1=50/2.5

V1=20L

Answer:

No matter how well how much you accomplish, or how much good you put into the world, you will always have haters. An unfortunate aspect of life is that some people hate when others do well.It’s just a way of life.some people just are jealous but dont let people brake you down.

Explanation:

hope this helps

Taking into account the definition of dilution, 83.3 mL of 0.0833 Lof 12 molar hydrochloric acid would be needed to create 1 L of a 1 molar solution of hydrochloric acid.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

12 M× Vi= 1 M× 1 L

Solving:

(1 M× 1 L)÷ 12 M= Vi

0.0833 L= 83.3 mL= Vi (being 1 L= 1000 mL)

In summary, 83.3 mL of 0.0833 Lof 12 molar hydrochloric acid would be needed to create 1 L of a 1 molar solution of hydrochloric acid.

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Answer:

B. A mixture has different properties throughout; a pure substance has the same properties throughout

Explanation:

Which of the following best describes the difference between a mixture and a pure substance?

A. A mixture has the same properties throughout; a pure substance has the different properties throughout.

B. A mixture has different properties throughout; a pure substance has the same properties throughout.

C. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom. ✓

D. A mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom.

Answer:

4ml

Explanation:

using;C1V1=C2V2

5V1=0.2×100

5V1=20

V1=20/5

V1=4ml

The solubility of carbon dioxide at 400 kPa  at room temperature is ;

( B ) 0.61 CO2/L

Given data

pressure of CO₂ = 400 Kpa = 3.95 atm

Kh of CO₂ = 3.3 * 10⁻² mol/L.atm

Solubility = pressure * Kh value of CO₂

                = 3.95 atm * 3.3 * 10⁻² mol / L.atm

                = 0.13 mol/l  CO₂

                = 0.61 CO₂ / L

Hence we can conclude that the solubility of CO₂ at 400 kPa is 0.13 mol/l  CO₂.

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From the options the closest answer is ( B ) 0.61 CO₂ / L

Answer:

4 mol MgO

Explanation:

convert the limiting reactant to product by using dimensional analysis in order to see how many moles total can be created of the product

4 mol Mg x [tex]\frac{2 mol MgO}{2 mol Mg}[/tex] = 4 mol MgO

Answer:

They would be different.

Explanation:

As the finches evolved and moved away from their primary island, they would differentiate and change their species slightly. Maybe color of=r beak shape.

Answer:

neutral

Explanation:

cause the all balance out

Answer:

273.15° C

Explanation: Ideal gasses tend to double in volume when their temperature doubles. 0°C = 273.15K so double 273.15 gives 546.3K.

Converting back to Celcius

546.3-273.15 =273.15°C

Explanation:

The barium – 137 cation would have 56 protons, 54 electrons and 81 neutrons.

The base used in deodorants is magnesium hydroxide. This is further explained below. Option B is correct.

Generally, A base is a chemical that reacts with hydrogen ions to neutralize an acid, a base ranges from 7-14 in the pH range

In conclusion, In deodorants, magnesium hydroxide is utilized as a base. The function of the base is to neutralize the acid released in our mouth by bacteria, which causes tooth decay and other associated problems.

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Answer:

C. magnesium hydroxide

Explanation:

Edge

The equation that is a decomposition reaction is

PbCO3(s) ---> PbO(s) + CO2(g)

That is option D. The properties of a decomposition reaction can further be understood below.

A chemical reaction is defined as the combination of substances called reactants to form a product. The various types of chemical reaction include:

Decomposition reaction is that type of chemical reaction in which the reactant breaks down to form two or more products.

Therefore the heating of lead (II) carbonate is a decomposition reaction.

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Answer:

The answer is yes! The Wind Pattern also known as trade winds. It can occur in other places near 30 Degrees to the north and south. for example In the east side Europe, Turkey, and Africa can all have trade winds And in north Algeria, Libya, Egypt, and Israel can also have trade winds.

I hope this helps!! :D

Answer:

Lighter-colored objects emit more light, and darker colored objects absorb more light. The more light an object absorbs, the more it heats up when it is exposed to light, which is why dark things get hot more quickly than light things if left out in the sun

Explanation:

Answer:

The water molecules are held tightly together by hydrogen bonding.

Explanation:

This bond gives surface tension to the water, therefore causing the feather to float.