What is the entropy change of the system when 17.5 g of liquid benzene (c6h6) evaporates at the normal boiling point? the normal boiling point of benzene is 80.1°c and δhvap is 30.7 kj/mol?

Answers

Answer 1

Answer : The entropy change of the system is, 19.5 J/K

Solution :

Formula used :

[tex]\Delta S=\frac{n\times \Delta H_{vap}}{T_b}[/tex]

or,

[tex]\Delta S=\frac{\frac{w}{M}\times \Delta H_{vap}}{T_b}[/tex]

where,

[tex]\Delta S[/tex] = entropy change of the system = ?

[tex]\Delta H[/tex] = enthalpy of vaporization = 30.7 kJ/mole

n = number of moles of benzene

w = mass of benzene = 17.5 g

M = molar mass of benzene = 78 g/mole

[tex]T_b[/tex] = normal boiling point of benzene = [tex]80.1^oC=273+80.1=353.1K[/tex]

Now put all the given values in the above formula, we get the entropy change of the system.

[tex]\Delta S=\frac{\frac{17.5g}{78g/mole}\times (30.7KJ/mole)}{353.1K}=0.0195kJ/K=0.0195\times 1000=19.5J/K[/tex]

Therefore, the entropy change of the system is, 19.5 J/K


Related Questions

The two jovian planets that contain the highest proportions of hydrogen compounds are ___________.

Answers

Final answer:

Jupiter and Saturn contain the highest proportions of hydrogen compounds. They are primarily composed of hydrogen and helium with hydrogen being the dominant element, and their atmospheres house several hydrogen-based gases and complex hydrocarbons.

Explanation:

The two Jovian planets that contain the highest proportions of hydrogen compounds are Jupiter and Saturn. These planets, known as the gas giants of our solar system, consist primarily of hydrogen and helium, with hydrogen being the more abundant element. Jupiter and Saturn's high gravitational force has compressed the gases in their interior until the hydrogen becomes a liquid, earning them the often misleading label of 'gas planets'.

However, the bulk of both planets consists of compressed, liquefied hydrogen, so they could more accurately be referred to as 'liquid planets'. This hydrogen-rich composition has influenced the chemistry of the outer solar system. Subsequently, the atmospheres of these planets are heavily populated with hydrogen-based gases such as methane (CH4) and ammonia (NH3), or more complex hydrocarbons.

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How do the valence electron configurations of alkali metals compared with each other?

Answers

They have the same number of valence electrons

What are elements 90-103 called on the periodic table?

Answers

they're called actinoids
Final answer:

The elements 90 to 103 on the periodic table are called the Actinide series. They are part of the 'f-block' and are all radioactive. Some well-known actinides are Uranium and Plutonium.

Explanation:

The elements numbered 90 to 103 on the periodic table are known as the Actinide series. These elements, which include Th (Thorium, 90) to Lr (Lawrencium, 103), are part of the 'f-block' and are often shown separately from the main body of the periodic table.

It is important to note that all of the actinides are radioactive, and some are not naturally occurring but synthesized in laboratories. The most well-known of these is probably U (Uranium, 92) and Pu (Plutonium, 94), commonly used in nuclear reactors and weapons.

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What process uses atomic particles of carbon and uranium to determine exact age?

Answers

This is the process of radioactive dating. Carbon is used because it is an essential part of all living organisms and has a radioisotope that decays with a half-life of 5000 years. This ratio makes it easy to date an object using Carbon-14. Uranium is used for objects that have a much longer half-life, outside the bounds of carbon's abilities.

Answer:

Radioactive dating

Explanation:

What is the name for the most abundant chemical sedimentary rock? what mineral is it made of? what is the chemical formula for that mineral?

Answers

The most abundant chemical sedimentary rock is limestone.
Limestone's are usually formed by biochemical processes in shallow seawater.
Calcite (CaCO3)

Limestone is the most prevalent type of chemical sedimentary rock. Calcite, also known as calcium carbonate, is the main component of limestone and has the chemical formula CaCO3.

What is a sedimentary rock?

The formation of sedimentary rocks involves the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. The processes that lead to the accumulation of these particles are collectively referred to as sedimentation.

Clastic, organic (biological), and chemical sedimentary rocks are the three different types of sedimentary rocks. Sandstone is a type of clast sedimentary rock, which is formed from fragments of other rocks.

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An atom of aluminum with a mass number of 24 and an atomic number of 13 has a total of

Answers

13 protons and 13 electrons 
14 neutrons.
You have wrote incorrect mass . The correct mass of aluminum is 27 and its atomic number is 13.

An atom of aluminum with a mass number of 26 and an atomic number of 13 has a total of 13 protons and electrons  and 13 neutrons.

What is an atom?

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Electrons move about the nucleus of an atom in regions called what?

Answers

called electron cloud or orbitals or in quantum mechanics it's called energy levels

Which property of isotopes makes them suitable for determining the dates of ancient artifacts? atomic number of the isotope rate of decay of the isotope radiation from the isotope stable nature of the isotope

Answers

Each isotope has a unique rate of decay, making them suitable for determining the dates of ancient artifacts. The answer is "rate of decay of the isotope."

Magnesium metal reacts with iodine gas at high temperatures to form magnesium iodide. what mass of mgi2 can be produced from the reaction of 5.15 g mg and 50.0 g i2

Answers

Final answer:

To find the mass of MgI2 produced in the reaction between Mg and I2, you need to calculate the moles of Mg and I2 and use the mole ratio from the balanced equation. Finally, convert the moles of MgI2 to grams using the molar mass of MgI2.

Explanation:

In this reaction, the balanced equation is 2Mg + I2 → 2MgI2. From the balanced equation, we can see that 2 moles of Mg react with 1 mole of I2 to produce 2 moles of MgI2. To find the mass of MgI2 produced, we need to calculate the moles of Mg and I2 and then use the mole ratio to determine the moles of MgI2. Finally, we can convert the moles of MgI2 to grams using the molar mass of MgI2.

Given: m(Mg) = 5.15 g, m(I2) = 50.0 g

Molar mass of MgI2 = 278.113 g/mol

Calculate the moles of Mg using the formula: moles = mass/molar massCalculate the moles of I2 using the same formulaFrom the balanced equation, the mole ratio between Mg and MgI2 is 2:2, so the moles of MgI2 will be the same as the moles of MgConvert the moles of MgI2 to grams using the formula: mass = moles x molar mass

Using these steps, you can determine the mass of MgI2 that can be produced from the given masses of Mg and I2.

In which orbital does an electron in a copper atom experience the greatest effective nuclear charge?

Answers

Obviously the orbital which is closer to nucleus. The 1s orbital will experience more nuclear charge, both from nucleus and other electrons.

Would it make a difference if calcium bromide solution, cabr2, were used rather than sodium bromide solution?

Answers

No it would not because solubility would not be affected since bromine is the only element in the reaction that is involved in the reaction.

The specific heat of silver (ag) is 0.245 j/ºc g. determine the energy required to raise the temperature of 350 g of ag from 293 k to 400 k.

Answers

9180 Joules First determine how many degrees the temperature is being changed. 400 K - 293 K = 107 K Since the units K and C have the same magnitude (they just have a different 0 point). We can freely exchange them when merely speaking of differences and not absolute values. So we can express the specific heat of silver as 0.245 J/ÂşC g or 0.245 J/K g. In any case, we now have 3 values with the units J/K g, g, and K. We desire a result with the units J. So it's a simple matter of multiplication and division such that we get the desired unit. Let's start with our specific heat 0.245 J/(K g) And let's cancel out the g term. Multiplying by our g term will do nicely. So 0.245 J/(K g) * 350 g = 85.75 J/K Now let's cancel out the K term. Another multiplication will do it. 85.75 J/K * 107 K = 9175.25 J Since we only have 3 significant figures in our data, round to 3 significant figures, giving 9180 J.

Specific heat equation is given as

[tex]Q =m\times c\times \Delta T[/tex]

where, Q = energy required

m = mass

c = specific heat

[tex]\Delta T[/tex] = change in temperature

Specific heat of silver ([tex]Ag[/tex]) is [tex]0.245 J/^{o}C g[/tex]

Mass of silver  = 350 g

[tex]\Delta T =T_{final}-T_{intital}[/tex]

Convert 400 K to degree Celsius = 400-273 = 127 K

Convert 293 K to degree Celsius = 293-273 = 20 K

Thus, [tex]\Delta T =127 K-20 K[/tex]

=   [tex]107^{o}C[/tex]

Put the values,

[tex]Q =m\times c\times \Delta T[/tex]

[tex]Q = 350 g\times 0.245 J/^{o}C g\times(107^{o}C)[/tex]

= 9175.25 J

Hence, energy required to raise the temperature is 9175.25 J



Write a balanced equation for the formation of one mole of nacl(aq) from its elements

Answers

2Na + Cl2 => 2NaCl 1 mol Na + 0.5 mol Cl2 => 1 mol NaCl

A balanced equation for the formation of one mole of NaCl (aq) from its elements is [tex]\rm2Na + Cl_2 \rightarrow 2NaCl[/tex].

What are elements?

Elements are defined as a substance that is entirely made up of the same kind of atoms, all of which have the same amount of protons in their nuclei. Every element has characteristics. Conductivity, magnetism, melting and boiling points, color, state of matter, and other characteristics are among these. The periodic table of elements is divided into sections, each of which contains groups of elements having related properties.

Balanced equation is defined as a chemical equation where the amount of each element's atoms on each side of the equation is equal and the mass is preserved. The law of conservation of mass stipulates that mass cannot be generated or destroyed, hence a chemical equation must always be in balance.

Thus, a balanced equation for the formation of one mole of NaCl (aq) from its elements is [tex]\rm2Na + Cl_2 \rightarrow 2NaCl[/tex].

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A 50 g sample of iron reacts with 21 g of oxygen to form how many grams of iron oxide?

Answers

Final answer:

To calculate the grams of iron oxide formed, you need to calculate the moles of iron and moles of oxygen in the reaction and use the mole ratio from the balanced chemical equation. From the given information, the moles of iron and oxygen are 0.894 mol and 1.3125 mol, respectively. Using the mole ratio of 4 moles of iron to 2 moles of iron oxide, we can calculate that 0.447 mol of iron oxide is formed. Finally, converting moles to grams, we find that 71.26 g of iron oxide is produced.

Explanation:

To determine the grams of iron oxide formed, you need to calculate the moles of iron and moles of oxygen in the reaction and use the balanced chemical equation to determine the mole ratio. From the given information, the molar mass of iron is 55.845 g/mol and the molar mass of oxygen is 16.00 g/mol. The balanced chemical equation for the reaction is:

4Fe + 3O₂ → 2Fe₂O₃

Using stoichiometry, we can calculate the moles of iron and oxygen:

Moles of iron = (50 g iron) / (55.845 g/mol) = 0.894 mol

Moles of oxygen = (21 g oxygen) / (16.00 g/mol) = 1.3125 mol

From the balanced chemical equation, we can see that the mole ratio of iron to iron oxide is 4:2. Therefore, for every 4 moles of iron, we get 2 moles of iron oxide. So, the moles of iron oxide formed in the reaction is:

Moles of iron oxide = (0.894 mol iron) / (4 mol iron) * (2 mol iron oxide) = 0.447 mol iron oxide

Finally, we can calculate the grams of iron oxide:

Grams of iron oxide = (0.447 mol iron oxide) * (159.69 g/mol) = 71.26 g iron oxide

When balancing a chemical equation, the number of h atoms in 2 ch4 is eight?

Answers

yes... that is correct.

CH4 is methane so the coefficent in front of it would double the number of atoms of each element

Steel is an alloy of one or more elements combined with which metal

Answers

Hello There!

An alloy is when two or more metallic elements are combined for different purposes.
Steel is an alloy of one or more elements combined with Iron.

Hope This Helps You!
Good Luck :) 

- Hannah ❤

Which of the following elements is a gas at room temperature?

fluorine (F)

sulfur (S)

mercury (Hg)

iodine (I)

Answers

The answer is fluorine.

It is thought that long-term memory never can get filled up. the term used to describe the capacity of long-term memory is ________.

Answers

Final answer:

The term used to describe the capacity of long-term memory is 'unlimited' or 'limitless' due to its potentially infinite capacity for storing information for extended periods.

Explanation:

The term used to describe the capacity of long-term memory is unlimited or limitless. Long-term memory (LTM) is a type of memory storage that can hold information for extended periods, ranging from days to years. Long-term memory differs from short-term memory in that it possesses a potentially infinite capacity; there is no known limit to what we can remember. Although the ability to retrieve information from LTM can be affected by various factors, such as consolidation and interference, the storage capacity itself is considered vast.

What is the expected outcome of adding a catalyst to a chemical reaction?
a.the reaction will speed up.
b.chemical equilibrium will not be reached.
c.the reaction will slow down.
d.no change will occur?

Answers

the answer is A my dude

Which noble gas has the greatest atomic number?

Rn

Ar

Xe

Kr

Answers

The answer is Rn with Atomic #86 

Hope this helps

Living things transform kinetic energy into potential chemical energy in the

Answers

<Sgx,JASYLDhLAxhclsxb cddont know

To find the number of neutrons in an atom, subtract its _____.

Answers

subtract it's atomic number from it's mass number

Explanation:

It is known that an atom consists of protons, neutrons and electrons. Both protons and neutrons are located inside the nucleus of an atom whereas electrons revolve around the nucleus.

Atomic number is the total number of protons present in an atom. On the other hand, atomic mass is the sum of total number of protons and neutrons present in an atom.

That is,     Atomic mass = no. of protons + no. of neutrons

                 no. of neutrons = atomic mass - no. of protons

Therefore, we can conclude that to find the number of neutrons in an atom, subtract its number of protons from atomic mass.

Electrons have almost no mass. True False

Answers

The answer for this is true 

TRUE is the perfect answer


hey help me please :)
What is a possible pH of acid rain?

7.0
6.9
4.3
10.5

Answers

the answer is 4.3.... that acid rain can range from 3-4 on a pH scale

the answer is 4.3.....

What is a reasonable estimate for the radius of an atom?

Answers

Answer is: 1 × 10⁻¹⁰ meter or 0.0000000001 meter.


The atomic radius is a measure of the size of the atom.

It is distance from the center of the nucleus of atom to the boundary of electron cloud.

The radius of atoms is between 30 and 300 pm (10⁻¹² m)  or between 0.3 and 3 angstroms (10⁻¹⁰ m). 

The radius generally decrease along each period of the Periodic table.

The electron configuration of the element chlorine ends in.
A. 3s2.
B. 3p6.
C. 3s23p5.
D. 3s23p7.

Answers

My answer would be c
i would say b.3p6
i hoped this helped

Which two ions will MOST LIKELY bond? A. bromine ion and iodine ion B. lithium ion and chlorine ion C. sodium ion and potassium ion D. calcium ion and magnesium ion

Answers

It would be lithium and Chlorine because they are trying to get 8 valence electrons and 1 valence electron plus 7 valence electrons.

Final answer:

Sodium ion and potassium ion are the two ions that are most likely to bond due to their positive charges.

Explanation:

The two ions that are most likely to bond are sodium ion and potassium ion. Both sodium and potassium are alkali metals in Group 1 of the periodic table and have a single electron in their outermost energy level. When they lose this electron, they form positively charged ions (cations). Since sodium has a +1 charge and potassium has a +1 charge, these ions are attracted to each other through electrostatic forces, forming a bond.

Part
b.1. eliseo couldn't find the 6 m hcl and so used 6 m hno3 for testing the metals instead. his logic? both are strong acids. explain how the results of the experiment would have been different.

Answers

We all know that HNO3 should have not been used in this redox titration because being an oxidizing agent it corrodes the compound itself while HCL is a very unstable or volatile and it takes slice in the response. And the final outcome would have produced a blue solution, whereas there would really be no reaction had he used the 6 M HCl as taught.

13. What is the difference between a solution and a heterogeneous mixture? Give an example of
each.
(4 points)

Answers

A solution is a solid (the solvent) dissolved in a liquid (the solute). A heterogeneous mixture is two substances in different states (i.e. a gas and a liquid) that are in the same space and are in contact with each other. When you have a solution that is a gas-gas or a liquid-liquid or possibly a solid-solid solution, the matter of greater amount is the solute. A solution is an example of a homogeneous mixture (can't see the particles with a naked eye). But with heterogeneous mixtures, you can see the particles.

Answer:

The macroscopic appearance is different.

Explanation:

The two (solution) and heterogeneous mixture are actually mixtures. These are made up of one of two pure substances in gaseous and liquid phases.

However, the difference lies in the macroscopic level of the particles.

A heterogeneous mixture is made of different substances. For example, when powdered milk is added to water, the mixture is a white substance, or colloidal mixture. The mixture is a heterogeneous in the sense that is all liquid; however, the mixture is not the same color as water. Thus, there is not complete dissolution.  

A solution is the same throughout. An example is dissolving sugar into water. The solution is colorless throughout. The difference is that the sugar and water have formed a solution whose properties are not visible to the naked eye.

Which of the following statements best describes the Aufbau principle?

Answers

The answer is the choice A
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