What number of moles of aluminum is required to completely react with 3.20 moles of iron(III) oxide, Fe2O3 according to the following reaction?
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Fe2O3 + 2 Al → 2 Fe + Al2O3

Answer:

393 mL

Explanation:

Recall the ideal gas law:

[tex]\displaystyle PV = nRT[/tex]

Because only pressure and volume are changing and everything else remains constant, we have that:
[tex]\displaystyle P_1V_1 = k = P_2V_2[/tex]

Where k is some constant.

Hence, substitute and solve:

[tex]\displaystyle \displaystyle \begin{aligned} (753\text{ torr})(513\text{ mL}) & = (982\text{ torr})V_2 \\ \\ V_2 & = 393\text{ mL} \end{aligned}[/tex]

Hence, the new volume is 393 mL.

Check: because volume decreases with an increase in pressure, our answer fits within the context of the problem.

Answer:

3x10^24 atoms to 1 sig fig

Explanation:

By definition, there are 6.022x10^23 atoms in a mole.

Multiply this by the 5 moles of silver to find the atoms of silver.

(5 moles)*(6.022x10^23 atoms/mole) = 30.110x10^23 atoms

3x10^24 atoms to 1 sig fig

25 moles of C3H8 will be produced from 75 moles of CO2.

To find the value of moles of a product from the number of moles of a reactant, it is necessary to observe the stoichiometric ratio between them:

                             [tex]C_3H_8 + 5 O_2 = > 3 CO_2 + 4 H_2O[/tex]

Analyzing the reaction, it is possible to see that the stoichiometric ratio is 1:3, so we can perform the following expression:

                            C3H8                CO2

                                      [tex]\frac{1mol}{xmol} =\frac{3mol}{75mol}[/tex]

                                         [tex]x = 25mol[/tex]

So, 25 moles of C3H8 will be produced from 75 moles of CO2.

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Answer:

8.3

Explanation:

Addition of anything which increases the ionic interaction of the solution may change the solubility.

This is defined as the ability of a substance(solute) to form a solution with a solvent such as water.

In the calculation of a solubility activities it is best to take note of any additional substance as it could increase the ionic interactions thereby leading to a change in solubility.

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The interactions taken into account when doing solubility calculations is that if we add anything which increases the ionic interaction of the solution this may change the solubility of the solute.

Solubility is the degree to which a substance dissolves in a solvent to make a solution.

In this case, the interactions taken into account when doing solubility calculations is that if we add anything which increases the ionic interaction of the solution this may change the solubility of the solute.

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Answer:

This paper is impregnated with iodide ions and starch and will turn black if treated with an oxidizing agent (e.g. HOCl) which oxidizes the iodide ions

Explanation: hope this helps :)

Answer:

When the cold water hits the hot glass inner wall of the flask the glass starts cooling and shrinking due to thermal expansion (in reverse). But heat conduction takes time, so for a brief moment the inside of the glass wall is colder than the outside of the glass wall.

Explanation:

Answer:

B. in space because it is a lot more colder in space then Mt. Everst

Answer:

2

Explanation:

2 atoms of hydrogen each of mass 1 = 2 x 1 = 2 g mol–1

1 atom of sulphur of mass 32 = 1 x 32 = 32 g mol–1

4 atoms of oxygen of mass 16 = 4 x 16 = 64 g mol–1

For 25.0 g of glucose, 138.9 ml of the 2.99 M glucose solution are needed.

The most common monosaccharide, or kind of carbohydrate, is often glucose.

Molar mass of glucose = 180.155 g/mol

Molarity of glucose = 2.99 M

Mass of glucose = 25.0 g

The formula for calculating the volume of a solution required to obtain a given mass of the solute is given by,

[tex]Volume of solution (V) =\frac{ Mass of solute (m) }{ Molar mass of solute (M)}* 1000[/tex]

Therefore, the volume of the 2.99 M glucose solution required to obtain 25.0 g of glucose is given by,

[tex]V = (\frac{25.0 }{ 180.155}) * 1000 V = 138.9 ml[/tex]

Hence, 138.9 ml of the 2.99 M glucose solution is required to obtain 25.0 g of glucose.

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Answer:

(1/2)(1.62) t^2 = 1.4

That will give you the time, t

Explanation:

hope this helps(✿◡‿◡)

Answer:

erm-- how do i answer this question xd

Explanation:

Gaining of an electron is most exothermic for Fluorine.

N2(g)+O2(g)→2NO(g) is an endothermic response because heat is absorbed on this reaction. all of the other reactions are exothermic as the warmth is launched for the duration of the method.

Any manner that absorbs warmness from its environment is an endothermic system. consequently, all endothermic reactions are endothermic strategies. An endothermic reaction is any chemical response that absorbs warmth from its surroundings. The absorbed electricity provides the activation electricity for the reaction to arise.

Fluorine is important for the manufacturing of nuclear material for nuclear power vegetation and for the insulation of electrical towers. Hydrogen fluoride, a compound of fluorine, is used to etch glass. Fluorine, like Teflon, is used to make plastics and is also essential in dental fitness.

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Answer:

The third quantum number of an electron gives information about the direction the electron is spinning. Option C. This is further explained below.

Generally, the three quantum numbers are simply defined by characteristic orbital n,l, and m are integers: 0, 1, 2, 3, and so on. The primary quantum number must not be 0.

Hence, the direction an electron spins is given by the third quantum number. This means that for a person to ascertain the direction of an electron the first property of the atom to consider will be the third quantum number.

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From the diagram, structure 1 would be the chloroplast and it represents the site of photosynthesis.

The image (see attached) is that of a plant cell and structure labeled 1 is the chloroplast.

The chloroplast of plant cells acts as the site of photosynthesis where inorganic materials are used to synthesize carbohydrates.

Plants generally serve as producers in food chains and thus, chloroplast helps sustain life.

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Answer:

D Structure 1 is a chloroplast which is the site of photosynthesis.

Explanation:

I got it correct on my test

Answer: 0.135 M

Explanation:

Answer:

because the water in a bottle has been purified  

Explanation:

Answer:

its becausesome water are mineral and some are not

Explanation:

Ionic substances produce ions in solution while molecular substances produce molecules in solution.

A solution is a combination of solute and solvent. The species that occur in solution depends on the type of substance that was dissolved. Since the table is not shown, we do not know exactly what compounds were dissolved in solution.

Generally, if an ionic substance is dissolved in solutions that ions are present in the solution. If a molecular substance is dissolved in solution, molecules are present in solution.

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Explanation: Hope it helps <3

The law of conservation of mass states that, for any closed system, the mass of the system must remain constant.

So, in other words, mass cannot be created nor destroyed.

In a burning log, the initial mass of the wood and the ashes that are left behind after it burns are different, which would seem to violate the law of conservation of mass.

Answer:

A graph, luminosity, temperature, decreases

Explanation:

:)

Answer:

“Whenever a conductor is placed in a varying magnetic field, an electromotive force is induced. Likewise, if the conductor circuit is closed, a current is induced, which is called induced current.”

Explanation:

Answer:

waxing crescent is the right answer to this question

Answer should be:

Cells

Answer:

similar cells and their intercellular material

Explanation:

cells make tissues which make organs

Britannica

Answer:

As the name suggests, oxyhaemoglobin is the oxygen bound to haemoglobin and carbamino-haemoglobin is the haemoglobin bound to CO2. Around 20-25% of CO2 is transported as carbamino-haemoglobin back to the lungs, whereas 97% of oxygen is transported as oxyhaemoglobin to the tissues from the lungs.

Explanation:

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The number of boxes is calculated by dividing the

total mass of hardware boxes by 1.00 kg

A hardware is a physical component of a system that can be touched and felt.

Because hardware are physical components, they always have a given mass.

Assuming, several hardware each of mass 1.00 kg is available to be chosen from.

Also, assuming that the sum total of the mass of all the hardware is known.

The number of boxes can be calculated as follows:

Therefore, the number of boxes is obtained by dividing the sum of the mass of the boxes by 1.00 kg.

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Answer:

Heat can accelerate the rate of rigor mortis

Explanation:

Took the test

Heat accelerates the rate of rigor mortis by providing a favorable environment for the bacteria and causing decay. Therefore, option (1) is correct.

Rigor mortis can be described as the third stage of death. Rigor mortis is a recognizable sign of death which is characterized by the stiffening of the limbs caused by chemical changes in the muscles postmortem.

In humans, rigor mortis can take place as soon as 4 hours after death. It typically lasts no longer than 8 hours at room temperature. After death, aerobic respiration ceases, depleting the amount of oxygen used in the making of ATP. ATP is mostly needed to cause the separation of the actin-myosin cross-bridges while the relaxation of the muscle.

When oxygen gas is no longer available, the body can continue to produce ATP through anaerobic glycolysis. When the glycogen is depleted, the ATP diminishes, and the body enters rigor mortis due to unable to break bridges.

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Explanation:

The molecules will be more separated, and will have least amount of intermolecular force of attraction. the substance's molecules will move faster and the substance will be a gas

[tex]Copper Sulphate : CuSO \tiny{4}[/tex]

ATQ :- mass of Copper Sulphate :- Cu+S+4(O)

[tex]63.5 + 32 + (4 \times 16) \\ 95.5 + 64 = 159.5grams[/tex]

your answer is :- 159.5 grams or appropriately 160 grams

Answer:

The molar mass of copper sulfate would be 159.5 g.

Explanation:

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