I need help. Thank you

Answer:

Fe: 23.1%

N: 17.4%

O: 59.5%

Explanation:

You take the grams that each weigh on the periodic table and add it all up. Afterward you create fractions of each over the whole. (Example: Fe/Fe+N+O) then you divide and turn that decimal into a percentage.

Answer:

An adult male is between 2.4-3m (8-10 feet) in size and weighs between 350-680kg (775-1500lbs). Females are slightly smaller at around 1.8-2.4m (6-8 feet) and weigh between 150-250kg (330-550lbs).

The dental assistant should respond to this patient’s concerns by telling him that the amount of x-ray is very minimal and can't cause any negative effect.

This is a penetrating form of electromagnetic radiation which produces images of the structures inside your body.

Exposure to large amounts of radiation could increase risk of cancer which is why minimal amounts which is safe is adopted.

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Answer:

  m

Explanation:

Answer:

CN is your answer.

Explanation:

Hope this helps!!!

Answer:

That’s because of the law of conservation of energy, which states that: Energy cannot be created or destroyed.

Explanation:

Energy may change form during a chemical reaction. For example, energy may change from chemical energy to heat energy when gas burns in a furnace. The exact amount of energy remains after the reaction as before.

The limiting reactant here is P4O10 . The percent yield of the product is caculated as 33.3%.

The limiting  reactant is the reactant that is in a minute quantity.

Number of moles of P4O10 =  85.5 g/284 g/mol = 0.3 moles

Number of moles of H2O =  74.9 g / 18 g/mol = 4.2 moles

From the reaction equation;

1 mole of P4O10 reacts with 6 moles of H2O

x moles of P4O10 reacts with 4.2 moles of H2O

x = 0.7  moles

Hence, P4O10 is the limiting reactant.

1 mole of P4O10 yields 4 moles of H3PO4

0.3 moles of P4O10 yields

0.3 moles * 4/1 = 1.2 moles

Mass of the H3PO4 = 1.2 moles * 98 g/mol = 117.6 g

Percent yield = 39.2 g/117.6 g * 100/1 = 33.3 %

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Answer:

pasture/range

Explanation:

this is because more than 1/3 of the country's land is being used for this mean alone.

Answer: Forest

Explanation: The largest percentage of land use in the United States is for forests.

Answer:

2Cl (aq) + Pb (aq) -> PbCl² (s)

Explanation:

Magnetic lines of force are are strongest at each pole, where the field lines are closest together.

A magnetic field is the region around a magnet where the influence of the magnet can be felt. The magnetic line of force show the intensity as well as the direction of the magnetic field.

The fact that is true for all magnetic fields is that they are strongest at each pole, where the field lines are closest together.

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Answer:

Antacids are bases that react stoichiometrically with acid. The number of moles of acid that can be neutralized by a single tablet of a commercial antacid will be determined by back titration.

Correct me if i'm wrong, Hope This helps

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Answer:

The Bohr model show the protons in a carbon atom using the model;  "Electrons move in fixed orbits around a nucleus of protons and neutrons."

According to Bohr's model of the atoms, the Rutherford model is basically correct. This implies that Bohr model accepts the idea of a nucleus containing nucleons(protons and neutrons).

In addition, the model also postulates that electrons are found in fixed orbits. These fixed orbits are called energy levels or shells.

A graphic description of this is shown in the image attached to this answer.

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Explanation:

Answer:

[tex]ch3ch2oh \: is \: alcohol \\ because \: it \: havve \: an \: oh \: grp \: \\ thank \: you[/tex]

Answer:

Explanation:

On the reactant side, XeO3 is a strong oxidizing agent. It can be a solid or gas. Most likely it is in a solid state.

H+ and Br- combine to form HBr which is a weak acid. So H+ and Br- are in an aqueous state.

On the product side, both Br2 and Xe are not very soluble in water. They will be in gaseous state and H2O is water i.e. liquid state.

The reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.

If you added 40.0 mL of Vitamin C stock solution instead of 25.0 mL when preparing Solution, the reaction rate is affected because of the lower amount of reactant for the chemical reaction. If the reactants are present in larger amount then the products are also produced in large concentration.

So we can conclude that the reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.

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Given the data from the question, the mass of arsenic that contains 1.23×10²⁰ atoms is 0.0153 g

6.02×10²³ atoms = 1 mole of arsenic

But

1 mole of arsenic = 75 g

Thus, we can say that:

6.02×10²³ atoms = 75 g of arsenic

6.02×10²³ atoms = 75 g of arsenic

Therefore,

1.23×10²⁰ atoms = (1.23×10²⁰ × 75) / 6.02×10²³ atoms)

1.23×10²⁰ atoms = 0.0153 g of arsenic

Thus, 1.23×10²⁰ atoms is present in 0.0153 g of arsenic

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Answer:

it,s is so many people do you want to go then

you are not study then stage change of it

If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.

A saturated solution is a solution in which there is so much solute that if there was any more, it would not dissolve. Its concentration is the same as the solubility at that temperature.

At 10 °C, the solubility is 31.2 g KCl/100 g H₂O.

30 g KCl × 100 g H₂O/31.2 g KCl = 96 g H₂O

At 60 °C, the solubility is 45.8 g KCl/100 g H₂O.

96 g H₂O × 45.8 g KCl/100 g H₂O = 44 g KCl

44 g - 30 g = 14 g

If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.

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Answer: city w

Explanation:

cities w,y,z all use renewable energy (sun, water, wind) which offput any greenhouse emmissions,

city w uses coal which produces greenhouse gases when used (burnt).

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Answer:

B Nematoda

Explanation:

Answer:

A

Explanation:

Is not my personal answer, but here is what I found.

"This entity has been manually annotated by the ChEBI Team. Potassium chromate is the inorganic compound with the formula (K2CrO4). This yellow solid is the potassium salt of the chromate anion"

Molar mass of NaHCO_3

Now

[tex]\\ \sf\longrightarrow No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]

[tex]\\ \sf\longrightarrow No\:of\; moles=\dfrac{2.61}{84}[/tex]

[tex]\\ \sf\longrightarrow No\:of\:moles=0.0312mol[/tex]

Answer: 4.7432 L

Explanation:

Use stoichiometry: .4235 mol CuCl2 (1 mol I2 / 2 mol CuCl2)(22.4 L / 1 mol I2) = 4.7432 L :)

use this formula m=n×M

Your n would be 6.25mols

Your Molar mass would be the number you get after adding the molar mass of your equation: HC2H302. Find your periodic table and look there.

And you plug in the molar number in the formula and you multiply n×M

I would help but I don't have the periodic table with me right now

Answer:

Al3Br1 -> Al1Br3

Explanation:

I believe you just swap it but I’m not 100%

Answer:

-OH

Explanation:

Alcohols generally have the structural formula OH

for example, ethanols structural formula is C2H5OH

Answer:

Their structure is related to their function.

Explanation:

Protein structure is related to their function. Therefore, the correct option is option D among all the given options.

Proteins are huge biomolecular and macromolecular structures made up of one or even more long amino acid residue chains. Proteins serve a wide range of roles inside animals, including catalyzing metabolic events, DNA replication, reacting to stimuli, provides support to organisms and cells including transporting chemicals.

Proteins differ largely in their amino acid sequence, which is determined by the genetic code from their genes and generally culminates with protein folding into such a particular 3D structure that dictates its function. Protein structure is related to their function.

Therefore, the correct option is option D.

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Answer:

Explanation:

bullet A layer of benzene (n = 1.50)2.60cm deep floats on water (n = 1.33) that is 6.50 cm deep. What is the apparent distance from the upper benzene surface to the bottom of the water laver when it is viewed at normal incidence?

The mass can be obtained from the molar mass when the number of moles is known.

The molecular formlar is the formula of the compound that shows the number of atoms of each element that is present in the molecule. Asprin is a moecule that has the molecular formula C9H8O4.

To use the molecular formula to determine weight, we have to know the number of moles involved.

Mass = number of moles * molar mass.

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Answer:

Sodium nitride is exothermic reaction and hydrochloric acid is endothermic reaction.