Please help fast I will give brainliest if correct

Explanation:

4Fe + 3O2 --> 2Fe2O3

Mass of  iron = 35g

How many moles of iron react?

The relationship between mass and moles is given as;

Moles = mass /  Molar mass

Molar mass of iron = 56g/mol

Number of moles = 35 / 56 = 0.625 mol

How many moles of oxygen molecules must react?

From the equation of the reaction;

4 mol of Fe reacts with 3 mol of Oxygen molecule

0.625 mol would react with x mol?

4 = 3

0.625 = x

x = 0.625 * 3 / 4 = 0.46875 mol

How many moles of product form?

From the equation of the reaction;

4 mol of Fe reacts to form 2 mol of Fe2O3

0.625 mol would form x mol of Fe2O3

4 = 2

0.625 = x

x = 0.625 * 2 / 4 = 0.3125 mol

What mass of product forms?

Moles = mass /  Molar mass

Mass = Molar mass * Moles = 159.69 g/mol * 0.3125 mol = 49.9g

Answer:

The Chemical Formula for Cadmium Fluoride is CdF2. What is the formula for francium permanganate? The compound francium permanganate has the chemical formula FrMnO4.

Explanation:

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, FrF is the formula of francium & fluoride.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The chemical compound formed using  francium & fluoride is FrF. Flourine and Francium is very reactive element.

Therefore, FrF  is the formula of francium & fluoride.

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Answer: there are 12 atoms of carbon. An example of an element is iron and an example of a compound is NaCl (salt)

Explanation:

Answer:

Mass = 176 g

Explanation:

Given data:

Volume of CH₄ = 89.6 L

Mass of CO₂ formed = ?

Solution:

Chemical equation:

CH₄ + 2O₂    →       CO₂ + 2H₂O

one mole of any gas at STP occupy 22.4 L volume.

number of moles of CH₄  that occupy 89.6 L = 89.6/22.4 = 4 mol

Now we will compare the moles of CH₄ and CO₂:

                CH₄            :          CO₂

                  1               :            1

                  4              :             4

Mass of CO₂:

Mass = number of moles × molar mass

Mass = 4 mol × 44 g/mol

Mass = 176 g

The mass in grams of CO₂ : 88 g

Given

44.8 liters of CH₄

Required

mass of CO₂

Solution

Reaction

CH₄ + 2O₂ → CO₂ + 2H₂O.

mol CH₄ :

= 44.8 : 22.4

= 2

From equation, mol ratio CH₄ :  CO₂ = 1 : 1, so mol CO₂ = 2

Mass CO₂(MW = 44 g/mol) :

= mol x MW

= 2 x 44

= 88 g

Answer:

I think 4j isn't it she does a work

Answer:

4 J

Explanation:

because work done equal to force × time taken

Answer:

4 phosphorus

Explanation:

The given compound is:

             2Ca₃(PO₄)₂

We have been given 2 moles of Ca₃(PO₄)₂ . The number of atoms is the same as the number of elements present within the compound. Since this is 2 moles, we multiply every number of atoms by 2;

      2Ca₃(PO₄)₂

Ca :  2 x 3  = 6 atoms

P :  2 x 2  = 4 atoms

O:  2 x (2 x 4) = 16 atoms

So we have 4 phosphorus atoms

Answer:

B. It speeds up the reaction that produces ammonia

Explanation:

i took the quiz

It speeds up the reaction that produces ammonia. Hence, option B is correct.

A catalyst is a substance that allows the chemical reaction to occur at a faster rate or under different conditions (e.g. at a lower temperature) without being affected by the reaction.

A catalyst enables a chemical reaction to proceed at a usually faster rate or under different conditions.

Hence, It speeds up the reaction that produces ammonia.

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Answer: The answer is C edu

Explanation:

The statement describes how this example is an application of Newton's laws of motion is According to Newton's third law of motion, the balloon resists any change of motion unless an unbalanced force acts upon it. Therefore, option C is correct.

The three fundamental laws of classical mechanics known as Newton's laws of motion describe how an object's motion and the forces acting on it interact. The following is a paraphrasing of these laws: Unless a force acts upon a body, it remains at rest or in continual straight-line motion.

The motion of an item is related to the forces operating on it by Newton's equations of motion. According to the first law, until a force acts on an item, it will not alter its motion.

According to the second law, an object's force is determined by multiplying its mass by its acceleration. According to the third law, when two objects interact, they exert equal-sized and opposite-direction pressures upon one another.

Thus, option C is correct.

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Answer:

Team 2

Explanation:

Team 1 pulls with a frce of 150N

Team 2 pulls with a force of 200N

In a tug-of-war, the goal is to pull the other team over a certain distance and this is determined by the force applied.

If the two team pulls with equal force, there wold be no net force and the teams stays in the same position.

In this case however, team 2 pulls with a force greater than team 1. There is a net force of 50N in favor of Team 2. This means team 2's force would neutralize that of team 1 and the excess force would be use in pulling Team 1

Answer: The mole ratio between Fe and [tex]O_2[/tex] is [tex]\frac{4Fe}{3O_2}[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The given balanced chemical equation is :

[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]

Thus 4 moles of iron (Fe) reacts with 3 moles of oxygen gas [tex](O_2)[/tex] to give 2 moles of ferric oxide [tex](Fe_2O_3)[/tex]

The mole ratio between Fe and [tex]O_2[/tex] is [tex]\frac{4Fe}{3O_2}[/tex]

Answer: Rutherford

Explanation:

Answer:

In the n = 3 energy level

Explanation:

There's is no further explanation for this.

All the electrons in an energy level are distribuited according to the period in the periodic table they are.

So, if we have an atom in period 1, like Hydrogen (H), that atom would only have 1 level energy (n = 1) and in that level, we only have the sub level 1s.

Electrons in the 3d sublevel, are found mostly in all the transition metals of period 3, and it can go from 1 to 10 electrons. To be with the 3d sub level it's neccesary that the energy level to be 3.

energy levels beyond that, like n = 4, we have electrons occupying the 3d sub level, so, primordly, the 3d is found only in energy level 3.

Hope this helps

Answer:

Only in the n = 3 energy level

Explanation:

Answer:

it is 1. 4 in stomach it is consentrated

Explanation:

1.5 to 3.5

Parietal cells contain an extensive secretory network (called canaliculi) from which the hydrochloric acid is secreted into the lumen of the stomach. The pH of gastric acid is 1.5 to 3.5 in the human stomach lumen, a level maintained by the proton pump H+/K+ ATPase.

Answer:

is this a worksheet or something

Explanation:

Answer:

The correct answer is - the stigma at the top of the pistil receives pollen.

Explanation:

Pollination or transfer of the pollen from one flower to another occurs naturally with the help of the animals, insects, or wind. With the help of these carriers, pollen moves from the flower to the one plant to the receptive surface of the stigma of other plants.

Stigma is the sticky top of the pistils which receives the pollen and starts fertilization by growing a tube to the ovary through the style (long neck between the stigma and ovary) called pollen tube.

The theoretical yield of C₆H₅Br = 70.336 g

Given

42.1 g of C₆H₆

71.7 g of Br2

Required

The theoretical yield

Solution

Reaction

C₆H₆ + Br₂ ⇒ C₆H₅Br + HBr

mol C₆H₆ :

= mass : MW C₆H₆

= 42.1 g : 78 g/mol

= 0.54

mol Br₂ :

= 71.7 g : 160 g/mol

= 0.448

Limiting reactant : Br₂(smaller mol)

mol C₆H₅Br based on Br₂ as a limiting reactant = 0.448

Mass C₆H₅Br :

= 0.448 x 157 g/mol

= 70.336 g

Answer:

a) 5.4 * 10^-4 moles

b) 8.2 moles

c) 0.26 moles

d) 20.76 moles

Explanation:

a)Since 1 mole of a substance has 6.02 * 10^23 atoms

x moles is present in  3.25 x 1020 atoms of lead

3.25 x 1020 atoms of lead/6.02 * 10^23 atoms = 5.4 * 10^-4 moles

b) Since 1 mole of a substance has 6.02 * 10^23 molecules

x moles is present in  4.96 x 1024 molecules of glucose

x = 4.96 x 1024 molecules of glucose/6.02 * 10^23 molecules = 8.2 moles

c) Since 1 mole of a substance has 6.02 * 10^23 formula units

x moles is present in 1.56 x 1023 formula units of sodium hydroxide

x =  1.56 x 1023 formula units /6.02 * 10^23 = 0.26 moles

d) Since 1 mole of a substance has 6.02 * 10^23 ions

x moles is present in 1.25 x 1025 copper(ll) ions

x = 1.25 x 1025 copper(ll) ions/6.02 * 10^23 ions = 20.76 moles

The number of moles in lead is 5.40 × 10⁻⁴ moles

The number of moles in glucose is 8.24 moles

The number of moles in sodium hydroxide is 0.259 moles

The number of moles in copper (II) ions is 20.76 moles

The number of moles of a substance is equal to 6.022 × 10²³ atoms. The number of moles of each given substance can be calculated by relating it to the Avogadro's constant 6.022 × 10²³ atoms.

Starting with a from the given parameters, we have:

Making x the subject of the formula, we have:

[tex]\mathbf{x = \dfrac{1 \ mole \times 3.25 \times 10^{20} \ atoms }{6.022 \times 10^{23} \ atoms}}}[/tex]

x = 5.40 × 10⁻⁴ moles

[tex]\mathbf{x = \dfrac{1 \ mole \times 4.96 \times 10^{24} \ molecules }{6.022 \times 10^{23} \ molecules}}}[/tex]

x = 8.24 moles

[tex]\mathbf{x = \dfrac{1 \ mole \times 1.56 \times 10^{23} \ units}{6.022 \times 10^{23} \ units}}}[/tex]

x = 0.259 moles

[tex]\mathbf{x = \dfrac{1 \ mole \times 1.25 \times 10^{25} \ ions }{6.022 \times 10^{23} \ ions}}}[/tex]

x = 20.76 moles

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Answer: molecule of the kind normally found in living systems. Organic molecules are usually composed of carbon atoms in rings or long chains, to which are attached other atoms of such elements as hydrogen, oxygen, and nitrogen.

Explanation:

Answer:

a) 26.79 * 10^23 particles

b) 1.51  * 10^23 particles

c) 13.5 * 10^23 particles

d) 57.6 * 10^23 particles

Explanation:

a) 1 mole of a substance contains 6.02 * 10^23 particles

4.45 mol of C6H1206 contains 4.45 * 6.02 * 10^23 particles = 26.79 * 10^23 particles

b) 1 mole of a substance contains 6.02 * 10^23 particles

0.250 mol of KNO3 contains 0.250 * 6.02 * 10^23 particles = 1.51  * 10^23 particles

c)  1 mole of a substance contains 6.02 * 10^23 particles

2.24 mol of H2 contains 2.24 * 6.02 * 10^23 particles = 13.5 * 10^23 particles

d) 1 mole of a substance contains 6.02 * 10^23 particles

9.56 mol of Zn contains  9.56 * 6.02 * 10^23 particles= 57.6 * 10^23 particles

A. The number of particles in 4.45 moles of C₆H₁₂O₆ is 2.68×10²⁴ particles.

B. The number of particles in 0.250 mole of KNO₃ is 1.51×10²³ particles.  

C. The number of particles in 2.24 moles of H₂ is 1.35×10²⁴ particles.

D. The number of particles in 9.56 moles of Zn is 5.76×10²⁴ particles.

From Avogadro's hypothesis, we understood that:

1 mole of any substance = 6.02×10²³ particles

With the above information in mind, we can obtain the answers to the questions as follow:

A. Determination of the number of particles in 4.45 moles of C₆H₁₂O₆.

1 mole of C₆H₁₂O₆ = 6.02×10²³ particles

Therefore,

4.45 moles of C₆H₁₂O₆ = 4.45 × 6.02×10²³

4.45 moles of C₆H₁₂O₆ = 2.68×10²⁴ particles

B. Determination of the number of particles in 0.250 mole of KNO₃

1 mole of KNO₃ = 6.02×10²³ particles

Therefore,

0.250 mole of KNO₃ = 0.250 × 6.02×10²³

0.250 mole of KNO₃ = 1.51×10²³ particles

C. Determination of the number of particles in 2.24 moles of H₂

1 mole of H₂ = 6.02×10²³ particles

Therefore,

2.24 moles of H₂ = 2.24 × 6.02×10²³

2.24 moles of H₂ = 1.35×10²⁴ particles

D. Determination of the number of particles in 9.56 moles of Zn

1 mole of Zn = 6.02×10²³ particles

Therefore,

9.56 moles of Zn = 9.56 × 6.02×10²³

9.56 moles of Zn = 5.76×10²⁴ particles

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The chemical formula for this compound : Cu₂SO₄-Copper(I) sulfate

Given

2 atoms of Copper, 1 atom of Sulfur and 4 atoms of Oxygen.

Required

The chemical formula

Solution

The number of atoms forming a compound is usually indicated from the subscript in the formula

From the problem it can be seen that the compound has:

2 atoms of Cu, 1 atom of S, and 4 atoms of O

So the formula:

Cu₂SO₄

Answer:

More electronegative

Explanation:

The oxygen and nitrogen in ammonia shows that they are more electronegative than the hydrogen  atoms.

The oxygen atom in water and the nitrogen atom in ammonia are more electronegative.

They attract the electrons more and they then become negatively charged.

The hydrogen will then become positively charged in the shared covalency.

Answer:

30

Explanation:

The atomic number of Zinc​ is 30.

Hope this helped!

Have a supercalifragilisticexpialidocious day!

Answer:

atomic number of zinc is 30

Explanation:

Mark brainless plz

The percent error of Denzel's measurement : 5.75%

Given

32.75 g measurement

Required

The percent error

Solution

% Error : difference between the theoretical value and the actual value

% Error for Denzel measurement :

1. Subtract the measurement value with the accepted value

= 32.75 g - 30.97 g

= 1.78 g

2. Divide by the accepted value, and multiply by 100

= (1.78/30.97) x 100%

= 5.75%

Answer:

The claim is: Therefore Mitosis requires less energy than sexual reproduction does.

Explanation:

Answer:

[tex]{5.11 * 10^{23} atoms Na}[/tex]

Explanation:

[tex]{26.3 g} {Na_{2}O}[/tex] * [tex]\frac{1 mol Na_{2}O}{61.979 g Na_{2}O}[/tex] * [tex]\frac{2 mol Na}{1 mol Na_{2}O}[/tex] * [tex]\frac{6.022*10^{23} atoms Na}{1 mol Na}[/tex]

= [tex]{5.11 * 10^{23} atoms Na}[/tex]

Answer:

NO2

Explanation:

Gases are known to deviate from ideal gas behavior as a result of intermolecular interaction between gas particles. The greater the magnitude of such intermolecular interaction, the greater the degree of deviation of the gas from the ideal gas law.

Now given that CO2 has dipoles that cancel out, the molecule is not really polar because it has no dipole moment. This is unlike NO2 that has a dipole moment and greater intermolecular interaction.

For the reason stated above, NO2 deviates more from ideal gas behaviour compared to CO2.

CO2 has dipoles that cancel out so the molecule is not really polar because it has no dipole moment. NO2 has a dipole moment and greater intermolecular interaction. NO2 deviates more from ideal gas behavior compared to CO2.