How do you calculate the percent composition of an element in a compound

Moles Fe₂O₃ produced : 1.16 moles

Given

2.32 moles of iron

Required

moles of Fe2O3

Solution

The reaction coefficient in a chemical equation shows the mole ratio of the reacting compounds (reactants and products)

Reaction

4 Fe + 3 O₂ ⇒  2 Fe₂O₃

From the equation, mol ratio Fe : mol Fe₂O₃ = 4 : 2, so mol Fe₂O₃ :

= 2/4 x mol Fe

= 2/4 x 2.32

= 1.16 moles

Answer:

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Explanation:

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Answer:

C. Sodium Chloride.

Explanation:

Because when NaCl dissolved in water, it will dissociate to produce 2 ions Na+ and Cl-.

The substance used as a reference standard in both the freezing-point and vapor-pressure models is A. Deionized water.

In osmometry, a reference standard is used to calibrate the instrument and establish a baseline for measurements. Both freezing-point and vapor-pressure osmometers require a known substance with well-defined properties for accurate calibration.

Deionized water (option A) is commonly used as the reference standard in osmometers because its freezing-point and vapor-pressure properties are well-established and easily reproducible.

The freezing-point of pure water is 0°C (32°F) at standard atmospheric pressure, and its vapor pressure is also well-defined.

Other substances like NaCl (option B) and KCl (option C) are used as calibration standards in specific contexts, but they are not universally applicable to both freezing-point and vapor-pressure osmometers.

Based on the given information, the substance used as a reference standard in both the freezing-point and vapor-pressure models is deionized water (option A). It serves as a reliable and widely accepted calibration standard for osmometers due to its well-defined freezing-point and vapor-pressure properties.

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If we begin with an initial SO2Cl2 pressure of 480 torr , after 71 seconds, the partial pressure of SO2Cl2 would be approximately 20 torr.

The reaction is : SO2Cl2 → SO2 + Cl2

To determine the partial pressure of SO2Cl2 after 71 seconds, we can use the first-order rate equation:

ln(Pt/P0) = -kt

Where:

Pt is the final partial pressure of SO2Cl2 after time t,

P0 is the initial partial pressure of SO2Cl2,

k is the rate constant,

t is the time.

Given:

Initial partial pressure (P0) = 480 torr

Rate constant (k) = 4.5 × 10^(-2) s^(-1)

Time (t) = 71 seconds

Rearranging the equation, we have:

Pt = P0 * e^(-kt)

Plugging in the values:

Pt = 480 torr * e^(-4.5 × 10^(-2) s^(-1) * 71 s)

Pt ≈ 480 torr * e^(-3.195)

Calculating the value:

Pt ≈ 480 torr * 0.041666 ≈ 20 torr

Therefore, after 71 seconds, the partial pressure of SO2Cl2 would be approximately 20 torr.

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The alkane with the molecular formula C10H16 has one ring. This ring structure reduces the number of hydrogen atoms by two compared to the corresponding straight-chain alkane.

To determine the number of rings in an alkane with the formula C10H16, we can compare it to the corresponding straight-chain alkane, which would be C10H22. Since the alkane C10H16 has 2 fewer hydrogen atoms than its straight-chain counterpart, it suggests the presence of one ring in the molecule.

The molecular formula of an alkane provides information about the number of carbon and hydrogen atoms in its structure. In the given formula C10H16, the presence of 10 carbon atoms indicates that it forms a chain of carbon atoms. However, since it has 16 hydrogen atoms, which is 2 fewer than the maximum number of hydrogen atoms possible for a straight-chain alkane with 10 carbon atoms, there must be a structural deviation. The deviation in the number of hydrogen atoms suggests the formation of one ring in the molecule. Each carbon atom in the ring contributes two hydrogen atoms, whereas in a straight-chain alkane, each carbon atom is bonded to three hydrogen atoms. By forming a ring, two of the carbon atoms in the chain lose one hydrogen atom each, resulting in a net loss of two hydrogen atoms.

Therefore, the alkane with the molecular formula C10H16 has one ring. This ring structure reduces the number of hydrogen atoms by two compared to the corresponding straight-chain alkane. It is important to note that the specific arrangement of the carbon atoms in the ring and their connectivity would determine the isomeric form of the molecule.

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Hey there !

Mass = 237 g

Volume 237 mL

Therefore:

Density = mass / Volume

D = 237 / 237

D = 1.0 g/mL

Hope this helps!

The average atomic mass of the element in the data table is 35.8738 amu.

The average atomic mass of an element can be calculated by taking into account the abundance of each isotope of the element and the atomic mass of each isotope. The formula for calculating the average atomic mass is:

Average atomic mass = (mass of isotope 1 * abundance of isotope 1) + (mass of isotope 2 * abundance of isotope 2) + ...

In the data table you provided, there are three isotopes of an element with atomic masses of 0.3365 amu, 35.97 amu, and 37.96 amu, and corresponding abundances of 0.0632%, 99.60%, and 0.3%, respectively.

Using the formula, we can calculate the average atomic mass as follows:

Average atomic mass = (0.3365 amu * 0.0632%) + (35.97 amu * 99.60%) + (37.96 amu * 0.3%)

Average atomic mass = 0.0002 amu + 35.7448 amu + 0.1188 amu

Average atomic mass = 35.8738 amu

Therefore, the average atomic mass of the element in the data table is 35.8738 amu.

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The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

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They emit ionizing radiation (alpha, beta, and/or gamma rays) that has the property of releasing energy. Because it has the potential to dislodge firmly bound electrons from an atom's orbit, the energy is known as ionizing radiation.

a radioactive process where a nucleus spontaneously splits, loses electrons, or undergoes fission while also emitting radiation.

Some of the mass of uranium nuclei is transformed into kinetic energy during radioactive decay (the energy of the moving particles).

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Answer: because

Explanation:h

First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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Answer ummmm

Explanation:

hope this helps!

Answer:

D. Paper D, paper C, paper A, paper B

Explanation:

Please check the attached image for a diagram showing clearly the pH colour chart

pH measures how acidic or alkaline a solution is. The pH scale ranges from 1 - 14

Solutions with a pH less than 7 are acidic

Solutions with a pH equal to 7 are neutral

In the image, test papers D and C occur on the left, thus, they are acidic

Solutions with a pH greater than 7 are alkaline

pH test papers are used to test to test how acidic or alkaline a solution is

Explanation:

H2S is the limiting reagent

H2S= 1/8 (least value)

O2= 1/4

The correct answer is c. Iron. Red water problems are primarily caused by the presence of iron in the water, which can cause discoloration and an unpleasant taste and odor.

Iron Red water problems are primarily due to the presence of iron in the water. When iron is oxidized, it forms insoluble reddish-brown particles that can cause staining and other issues. Hardness refers to the concentration of dissolved minerals like calcium and magnesium in water, while turbidity refers to the cloudiness or haziness of water caused by suspended particles. Hydrogen sulfide is a gas that can cause a rotten egg odor in water.

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The type of fatty acid which do not bind together due to the bend in the structure ae unsaturated fatty acids which have branched chain structures.

The unsaturated fatty acids are those which have one or more carbon-carbon double bonds. For example: palmitoleic acid, oleic acid are considered as unsaturated fatty acids. The unsaturated fatty acids cannot be tightly packed due to which it makes them easier to pass more fluidly through the body.

The monounsaturated fatty acids are also liquid at room temperature due to the bend structure. On the other hand, saturated fatty acids can be easily packed as they are generally straight chain compounds.

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The notation for the enthalpy of the solution is ∆Hsol. The correct answer is option ∆Hsol.

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The number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.

Atomic number of an element is the number of protons in an atom of the element while the atomic mass is the sum of the protons and neutrons in the atom.

The electron number is equal to the number of protons in a neutral atom.

According to this question, the isotope of an element has an atomic number of 79 and a mass number of 200.

Therefore, the number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.

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1) Vapor pressure. Water exerts vapor pressure. This pressure is produced by the water molecules that change their state from liquid to gas.

2) Setting a similar system and watching what happens.

If we set a system similar to that shown in the image (place the cup of water in the jar and then close the jar), we will see the following

1) The big jar has no molecules of water gas since we just closed it.

2) Some water molecules change from liquid to gas and start filling the big jar.

3) The big jar will have a certain amount of vapor water.

4) The big jar has so much water that it starts condensing on the walls of the big jar.

5) After enough water is condensed on the walls, it runs down the walls and precipitates.

3) The order observed.

1) Water evaporated from the cup

2) water condensed on the walls of the jar.

3) Water precipitated, or ran down the walls of the jar.

Answer:

The answer is 32. 29

Explanation:

Answer:

Plants and animals are pH sensitive. The growth of plants is dependent on the nature of the soil. If the pH of the soil is greater than 7 and is alkaline, then the plants cannot grow in the soil.

Explanation:

The characteristics of the acid-catalyzed hydration of an alkene is the characteristics of the acid-catalyzed hydration of an alkene

The net addition of water across the double bond can convert alkenes to alcohol. This change can be attained in a number of different ways. Hydration of alkene  is the process of adding water to alkenes in a definite amount to convert alkene to alcohol. This method is often used for the preparation of alcohol from alkene.

The acid catalyst dissociates to give a H+ ion in solution - this H+ can be shown alone, but is typically attached to water to form an H3O+ hydronium ion.

Reaction undergoes carbocation rearrangement due to carbocation intermediates

The carbocation intermediate is a sp2 hybridised molecule. This allows water to attack the top or bottom of the racemic product.

This is a solvolytic reaction in which the solvent (water) is involved in the reaction.

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Answer: The percent by volume of isopropyl alcohol in a solution made by mixing 120 mL of the alcohol with enough water to make 350 mL of solution is 25.5%.

Explanation:

Given: Volume of solute = 120 mL

Volume of solvent = 350 mL

Now, total volume of the solution is as follows.

\(V_{total} = V_{solute} + V_{solvent}\\= 120 mL + 350 mL\\= 470 mL\)

Let us assume that 100 mL of solution is taken and the amount of isopropyl alcohol present in it is as follows.

\(\frac{V_{solute}}{V_{total}} \times 100 mL\\\frac{120 mL}{470} \times 100 mL\\= 25.53 mL\)

Hence, there is 25.53 mL isopropyl alcohol is present in 100 mL of solution. Therefore, %v/v is calculated as follows.

\(Percent (v/v) = \frac{25.53 mL}{100 mL}\\= 25.5%\)

Thus, we can conclude that the percent by volume of isopropyl alcohol in a solution made by mixing 120 mL of the alcohol with enough water to make 350 mL of solution is 25.5%.

Answer:

\(40 \times 1 = 40\)

Answer:

CuO + Zn → ZnO + Cu

Explanation:

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Answer:

Volleyball

Explanation:

A P E X :)

Volleyball is not a racquet sport. Thus, the correct option is B.

Sports may be defined as any physical activity that involves physical endeavor and skill in which an individual or team participates against another or others for entertainment. Sports are good for physical as well as mental health of an individual.

The dimensions of a badminton racquet have a maximum length of 680mm, while its overall width is permitted to be 230mm.

The dimensions of a table tennis racquet have an average of length 17 cm., a width of 15 cm., and an overall length ranging between 240 to 260mm.

The dimensions of a squash racquet have a maximum dimension of 686mm in length, while 215mm in width. It has a maximum stung area of 500 square centimeters.

Therefore, Volleyball is not a racquet sport. Thus, the correct option is B.

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