What is the change in enthalpy 180 g of water vapor condenses at 100°C

After 7 half-lives, 0.78% of a substance remains. This is calculated by taking 0.5 to the power of 7, as each half-life represents a 50% reduction of the remaining substance from the previous amount.

To determine what percentage of a substance remains after 7 half-lives, you can calculate the remaining quantity using the principle that after each half-life, only 50% of the substance remains from the previous amount. So after 1 half-life, 50% remains; after 2 half-lives, 25% remains (which is 50% of 50%); and this process continues.

To find the remaining percentage after 7 half-lives, you would calculate (0.5)^7. That means you take 0.5 (half of the substance) and multiply it by itself 7 times. The calculation will look like this: 0.5 x 0.5 x 0.5 x 0.5 x 0.5 x 0.5 x 0.5 = 0.0078125, which is 0.78125%. You can round this to 0.78%, which is the closest answer to the options given and would be the correct choice.

Answer:

0.1%

Explanation:

Answer:

Covalent is the type of bond.

Answer:

Covalent

Explanation:

Took the test and got it right :)

Answer:976,600

Explanation:

I had the exact same question and I got it right.

Answer:

976,563

Explanation:

this is the true answer

The periodic table is one of the most important tools in the history of chemistry. It describes the atomic properties of every known chemical element in a concise format, including the atomic number, atomic mass and relationships between the elements. Elements with similar chemical properties are arranged in columns in the periodic table.

The table thus is a quick reference as to what elements may behave the same chemically or which may have similar weights or atomic structures.

Hope this answer helps you

Answer:

b. Each chlorine has three non-bonded pairs and one bonded pair of electrons.

Explanation:

Chlorine has three valance electrons. Each Cl atom forms a single covalent bond with the central P atom by sharing a pair of electrons. After forming a single covalent bond each Cl atom is left with six electrons that do not participate in any bond formation or there are three pairs of lone electrons.

Hope this helps :)

Answer:

Each chlorine has three non-bonded pairs and one bonded pair of electrons.

Explanation:

Answer:

The volume in the container is 15.86 L

Explanation:

Step 1: Data given

Temperature = 17.0 °C = 290 K

Number of moles = 0.800 moles

Pressure = 1.20 atm

Step 2: Calculate the volume of the container

p*V = n*R*T

⇒with p = the pressure of the gas = 1.20 atm

⇒with V of the container = TO BE DETERMINED

⇒with n = the number of moles = 0.800 moles

⇒with R = the gas constant = 0.08206 L*Atm/mol*K

⇒with T = the temperatur = 17.0 °C = 290 K

V = (n*R*T)/p

V = (0.800 moles * 0.08206L*atm/mol*K * 290 K) / 1.20 atm

V = 15.86 L

The volume in the container is 15.86 L

Answer:490

Explanation: 5.22x10-3= 49.2 49.2x10-2=490

Answer:

236.76 J

Explanation:

Parameters given:

Mass of sample, m = 6.50 g

Initial temperature, [tex]T_1 = 34^o C[/tex]

Final temperature, [tex]T_2 = 189^oC[/tex]

Specific heat capacity of gold, [tex]c = 0.235 J/g^oC[/tex]

Heat of a substance is related to specific heat capacity by the formula:

[tex]H = mc(T_2 - T_1)[/tex]

[tex]H = 6.5 * 0.235 * (189 - 34)\\\\\\H = 6.5 * 0.235 * 155\\\\\\H = 236.76 J[/tex]

236.76 J of heat is required to raise the temperature of the sample.

The quantity of heat, in Joules, required to raise the temperature is 236.76 J

From the question we are to determine quantity of heat required

Using the formula

Q = mcΔT

Where Q is the quantity of heat

m is the mass of substance

c is the specific heat capacity

and ΔT is the change in temperature

From the given information,

m = 6.50 g

c = 0.235 J/g °C

ΔT = 189 °C - 34 °C = 155 °C

Putting the parameters into the formula, we get

Q = 6.50 × 0.235 × 155

Q = 236.76 J

Hence, the quantity of heat, in Joules, required to raise the temperature is 236.76 J

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Answer:

A physical system

Explanation:

It doesn't allow certain types of transfers, though the transfer of energy is permitted.

Answer:

A

Explanation:

Answer:

1. Abiotic

2. Biotic

3. Biotic

Explanation:

Abiotic includes nonliving.

Biotic includes living.

Answer:

abiotic

biotic

abiotic

Explanation:

Answer:

11.52g of ethanol

Explanation:

Molality is an unit of concentration defined as ratio between moles of solute (In this case, ethanol) and kg of solvent.

As solvent is water, 1 liter of water weights 1kg.

That means to create a 0.25molal solution it is necessary to have 0.25 moles of ethanol.

Molar weight of ethanol (C₂H₆O) is:

C: 12.01g/mol × 2 = 24.02g/mol

H: 1.01g/mol × 6 = 6.06g/mol

O: 16g/mol × 1 = 16g/mol

24.02g/mol + 6.06g/mol + 16g/mol = 46.08g/mol

As you need 0.25 moles, there is necessary to weight:

0.25 moles × (46.08g/mol) = 11.52g of ethanol

Answer:

Prevailing winds

Presence of mountains

Seasonal winds.

Explanation:

Prevailing winds:

Prevailing winds is the wind that blows across an area or surface over time. It affects the amount of precipitation. If winds blows inland from water bodies such as oceans the amount do precipitation will be high because they carry more water vapor than the winds that blow over land.

Presence of mountains :

Mountain ranges affect precipitation too.The windward side of the mountain, which is the side the wind hits has higher precipitation while the land on the other side of the mountain, leeward side, will have little precipitation.

Answer:

Prevailing winds

Presence of mountains

Seasonal winds.

Explanation:

Prevailing winds:

Explanation:

Prevailing winds is the wind that blows across an area or surface over time. It affects the amount of precipitation. If winds blows inland from water bodies such as oceans the amount do precipitation will be high because they carry more water vapor than the winds that blow over land.

Presence of mountains :

Mountain ranges affect precipitation too.The windward side of the mountain, which is the side the wind hits has higher precipitation while the land on the other side of the mountain, leeward side, will have little precipitation.

Answer:

When you remember salt is soduim chloride so you put it on everything to feel smart.

Explanation:

Sorry im bad at this : - /

Answer:

C

Explanation:

Molarity=number of moles/volume

Hence:

Moles required=Molarity×volume

=4mol/L×12L=48moles

Hint:As L(litre will cancel out))

Answer is C

The required moles of solute will be "48 mol".

An aqueous solution containing one mole of something like a chemical dissolved throughout one liter of water or liquid is considered a Molar solution.

According to the question,

Molarity = 4 M

Volume = 12 L

We know the formula,

→ Molarity = [tex]\frac{Number \ of \ moles}{Volume}[/tex]

or,

→ Moles required = Molarity × Volume

By substituting the values, we het

                             = 4 × 12

                             = 48 moles

Thus the correct answer be "Option C" i.e., 48 mol.

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Answer:

nuclear energy is the cleanest and safest energy source we have available and i agree with this statement for following reasons:

1.  Nuclear power is generated by a controlled chain reaction involving the splitting of atoms. A modern nuclear power plant uses the intense heat created by this reaction to heat water and create steam, which turns a turbine and generates electricity. Whereas a coal-fired plant heats water by burning coal, a nuclear plant heats it by splitting atoms. This process is called nuclear fission.

2. Nuclear fission, in simple terms, occurs when an atom splits in two, releasing a massive amount of energy and several subatomic particles called neutrons. These neutrons, in turn, hit and split other atoms, beginning and sustaining the chain reaction. Reactor operators control this reaction in a variety of ways and thus regulate the amount of heat generated and energy produced.

3. The raw fuel for this process is the metal uranium, which must be enriched before it can be used for producing energy in commercial reactors. Enrichment is necessary because mined uranium ore is around 99.3 percent uranium-238, which, in today’s commercial power plants, does not readily split upon exposure to neutrons from the fission chain reaction, and thus makes poor fuel. The other 0.7 percent of mined uranium is uranium-235, which makes excellent fuel. The number refers to the atomic mass, or the total mass of protons and neutrons that make up the atomic nucleus. This difference in mass of the same element makes them two different isotopes of uranium. The enrichment process consists essentially of increasing the percentage of uranium-235 by decreasing the percentage (via removal) of uranium-238.

Answer:

S = 1.6 E-4 M

Explanation:

          S               S              S

∴ Ksp = 2.7 E-8 = [Zn2+]*[CO42-]

⇒ Ksp = (S)*(S) = S² = 2.7 E-8

⇒ S² = 2.7 E-8

⇒ S = √2.7 E-8

⇒ S = 1.6432 E-4 M ≅ 1.6 E-4 M

Answer:

Ionic have high melting and boiling points while covalent has low melting and boiling points.

Compound with ionic bonding have high melting points as compared to the compounds with covalent bonding.

Ionic bonding or electrovalent bonding is a type of bonding which is formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bonding called the ionic bonding.The compounds with ionic bonding have high melting points ,high density and are malleable and ductile as well.

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To determine the molar mass of Zn, we first calculated the moles of H2 gas using the ideal gas law with corrected gas pressure, and then used this to find the moles of Zn which was equal to the moles of H2. By dividing the mass of Zn by the moles of Zn, we found the molar mass to be 66.7 g/mol.

To calculate the molar mass of Zn, using the data provided, we first have to use the ideal gas law to find the number of moles of H2 gas produced. The barometric pressure is given as 748 mm Hg, from which we need to subtract the vapor pressure of water at 23°C (21 mm Hg) to find the actual pressure of the hydrogen gas.

The corrected gas pressure is, therefore, 748 mm Hg - 21 mm Hg = 727 mm Hg. Converting this to atmospheres (atm): 727 mm Hg * (1 atm / 760 mm Hg) = 0.957 atm. Given that the volume of the gas is 46.5 mL (which we convert to liters: 46.5 mL * (1 L / 1000 mL) = 0.0465 L) and temperature is 23°C (which we convert to Kelvin: 23 + 273 = 296 K), we can use the ideal gas law (PV = nRT) to calculate the number of moles of hydrogen gas (n).

Calculate moles of H2:

PV = nRT

n = PV / RT

n = (0.957 atm * 0.0465 L) / (0.0821 L atm mol-1 K-1 * 296 K)

n = 0.00180 moles of H2

Since one mole of Zn produces one mole of H2, the moles of Zn reacted is also 0.00180. The molar mass (M) of Zn can now be calculated by dividing the mass of the Zn by the moles of Zn consumed.

Calculate molar mass of Zn:

M = mass / moles

M = 0.120 g / 0.00180 mol

M = 66.7 g/mol

The answer is: 65.22. The molar mass of Zn is approximately 65.22 g/mol.

1. Calculate the pressure of the dry hydrogen gas by subtracting the vapor pressure of water from the total pressure. The total pressure is given as 748 mm Hg, and the vapor pressure of water at 23°C is 21 mm Hg.

  Dry H₂ gas pressure = Total pressure - Vapor pressure of water

 Dry H₂ gas pressure = 748 mm Hg - 21 mm Hg

 Dry H₂ gas pressure = 727 mm Hg

2. Convert the pressure of the dry hydrogen gas from mm Hg to atmospheres (atm).

 1 atm = 760 mm Hg

  Dry H₂ gas pressure in atm = 727 mm Hg - (1 atm / 760 mm Hg)

 Dry H₂ gas pressure in atm = 0.9566 atm

 3. Convert the temperature from degrees Celsius to Kelvin (K).

 T(K) = T(°C) + 273.15

 T(K) = 23°C + 273.15

 T(K) = 296.15 K

 4. Use the Ideal Gas Law to calculate the number of moles of hydrogen gas produced. The Ideal Gas Law is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

  Rearrange the Ideal Gas Law to solve for n (number of moles of H₂):

 n = PV / RT

 We need to convert the volume of H2 gas from mL to L:

 1 L = 1000 mL

 V = 46.5 mL = 0.0465 L

  Now, plug in the values:

 n = (0.9566 atm)(0.0465 L) / (0.0821 L·atm/mol·K)(296.15 K)

 n = 0.00184 mol

 5. According to the balanced chemical equation for the reaction of zinc with hydrochloric acid, the reaction is:

 Zn(s) + 2HCl(aq) -- ZnCl₂(aq) + H2(g)

  From the stoichiometry of the reaction, 1 mole of Zn produces 1 mole of H₂ gas. Therefore, the moles of Zn reacted is equal to the moles of H₂ gas produced.

  Moles of Zn = Moles of H₂

 Moles of Zn = 0.00184 mol

 6. Finally, calculate the molar mass of Zn using the mass of the Zn sample and the moles of Zn reacted.

 Molar mass of Zn = Mass of Zn sample / Moles of Zn

 Molar mass of Zn = 0.120 g / 0.00184 mol

 Molar mass of Zn = 65.22 g/mol

 This value is close to the accepted molar mass of Zn, which is 65.38 g/mol, indicating that the calculation is consistent with the expected value.

Answer:

0.055g/mL

Explanation:

Data obtained from the question include:

Molar Mass of the gass sample = 71g/mol

Volume of the gas sample = 1300 mL

Density =?

The density of a substance is simply mass per unit volume. It is represented mathematically as:

Density = Mass /volume.

With the above equation, we can easily obtain the density of sample of gas as illustrated below:

Density = 71g / 1300 mL

Density = 0.055g/mL

Therefore, the density of the gas sample is 0.055g/mL

Final answer:

To find the final molarity of the solution, use the formula M1V1 = M2V2. Plugging in the values, we can solve for M2, which is the final molarity. In this case, the final molarity is 0.160 M.

Explanation:

To find the final molarity of the solution, we need to use the formula:

M1V1 = M2V2

Where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.

In this case, M1 is 0.800 M, V1 is 100. mL, M2 is unknown, and V2 is 500. mL. Plugging in these values, we can solve for M2:

(0.800 M)(100. mL) = M2(500. mL)

Dividing both sides by 500. mL gives:

M2 = (0.800 M)(100. mL) / 500. mL = 0.160 M

Therefore, the final molarity of the solution is 0.160 M.

Number of moles = 5.7 moles of oxygen.

Explanation:

We have to convert number of molecules into number of moles by dividing the number of molecules by Avogadro's number.

Here number of molecules of oxygen given is 34.1 × 10²³ molecules.

Now we have to divide the number of molecules by Avogadro's number as,

Number of moles = [tex]$\frac{number of molecules}{Avogadro's number}[/tex]

                            = [tex]$\frac{34.1}{6.022} \times \frac{10^{23} }{10^{23} }[/tex]

                          = 5.7 moles

So here molecules is converted into moles.

To find the pressure in the scuba diver's tank, you can use the Ideal Gas Law. Convert the provided quantities into appropriate units (g to moles, °C to K, etc), then substitute into the Ideal Gas Law equation to solve for pressure.

To calculate the pressure in the scuba diver's tank, it is necessary to apply the Ideal Gas Law, which states PV = nRT. Here, P is pressure, V is volume, n is moles of the gas, R is the ideal gas constant and T is temperature in Kelvin.

First, you need to convert all the given values into compatible units. 0.29 grams of Oxygen need to be converted to moles. We know that the molar mass of Oxygen is about 32 g/moles, hence, 0.29 g is approximately 0.00906 moles. The volume of 2.3L is appropriate as is, and the temperature needs to be converted from Celsius to Kelvin by adding 273.15 to the °C value. Thus, the temperature will be 9 + 273.15 = 282.15 K.

Substituting the found values and the ideal gas constant (which is about 0.0821 L·atm/(K·mol) in this case) in the equation P = nRT / V, we have:

P = (0.00906 moles * 0.0821 L·atm/(K·mol) * 282.15K) / 2.3L

By calculating the above expression, we can get the pressure in the diving tank.

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To find the pressure in the scuba tank, you can use the ideal gas law equation (PV=nRT). Convert the given temperature to Kelvin and the given mass of oxygen to moles. Plug the values into the equation to solve for the pressure, which is approximately 0.110 atm.

To find the pressure in the scuba tank, we can use the ideal gas law equation, which is PV = nRT. In this equation, P represents the pressure, V represents the volume, n represents the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

We first need to convert the given temperature of 9°C to Kelvin. To do this, we add 273.15 to the Celsius temperature, giving us 9 + 273.15 = 282.15 K.

Next, we convert the given mass of oxygen (0.29g) to moles. Since the molar mass of oxygen (O₂) is 32 g/mol, we divide the mass by the molar mass: 0.29g / 32 g/mol = 0.009 mol.

Now we can plug the values into the ideal gas law equation and solve for the pressure:

PV = nRT

P * 2.3L = 0.009 mol * 0.0821 L·atm/mol·K * 282.15 K

P = (0.009 mol * 0.0821 L·atm/mol·K * 282.15 K) / 2.3L

P ≈ 0.110 atm

Therefore, the pressure in the scuba tank at 9°C is approximately 0.110 atm.

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Answer:

ACDE

Explanation:

just answered this question on edg

Answer: A C D and E

Explanation: I just did it.

Answer:

The percent yield would be 81.51%

Explanation:

Number of moles of CoCl2·6H2O would be calculated by using the formula

number of moles = given weight/molecular weight.

Thus, by putting values,

= 11.0323/237.83

= 0.046387

Number of moles of CO+2 = Number of moles of CoCl2·6H2O = 0.046387

As we know that CoCl2·6H2O is a limiting reactant, therefore, the number of moles of complex = Number of moles of CO+2 = 0.046387.

Hence, we can calculate the mass of the complex as follows:

Molecular weigth x number of moles = 250.45 x 0.046387

Thus, the theoratical yield would be 11.6176.

We know that actual yield as given in statement is 9.4705 g. Therefore, percent yield would be,

= (9.4705 / 11.6176) x 100

= 81.51%