Calculate the mass of 2.50 mol of CH,OH(1). Show your work. Use the appropriate
number of significant digits in your final answer.

Help please

Answer:

138.57 g/mol.

Explanation:

The following data were obtained from the question:

Temperature (T) = 23.8 °C

Pressure = 432 mmHg

Density (D) = 3.23 g/L

Next, we shall obtain an expression for the density in relation to molar mass, pressure and temperature.

This can be obtained by using the ideal gas equation as shown below:

PV = nRT.... (1)

Recall:

Mole (n) = maas(m) /Molar mass (M)

n = m/M

Substituting the value of n into equation 1

PV = nRT

PV = mRT/M

Divide both side by P

V = mRT/MP

Divide both side by m

V/m = RT/MP

Invert the above equation

m/V = MP /RT..... (2)

Recall:

Density (D) = mass(m) /volume (V)

D = m/V

Replace m/V with D in equation 2

m/V = MP /RT

D = MP /RT

Thus, with the above formula we can obtain the molar mass of chlorofluorocarbon (CFC) as shown below:

Temperature (T) = 23.8 °C = 23.8 °C + 273 = 296.8 K

Pressure = 432 mmHg = 432/760 = 0.568 atm

Density (D) = 3.23 g/L

Gas constant (R) = 0.0821 atm.L/Kmol

Molar mass (M) =..?

D = MP /RT

3.23 = M x 0.568 / 0.0821 x 296.8

Cross multiply

M x 0.568 = 3.23 x 0.0821 x 296.8

Divide both side by 0.568

M = (3.23 x 0.0821 x 296.8) / 0.568

M = 138.57 g/mol

Therefore the molar mass of CFC is 138.57 g/mol.

Answer:

Saturated solution = 180 gram

Explanation:

Given:

Solubility of Z = 60 g / 100 g water

Given temperature =  20°C

Amount of water = 300 grams

Find:

Saturated solution

Computation:

Saturated solution = [Solubility of Z] × Amount of water

Saturated solution = [60 g / 100 g] × 300 grams

Saturated solution = [0.6] × 300 grams

Saturated solution = 180 gram

Answer:

(iv) (A) is false, but (R) is true.

Explanation:

It is not true that carbon has a strong tendency to either lose or gain electrons to attain noble gas configuration. Carbon is a member of group 14, it is the first member of the group and carbon is purely a non metal. Only metals metals can loose electrons to attain the noble gas configuration. Moreover, carbon does not participate in ionic bonding so it does not gain electrons to attain the noble gas configuration.

However, carbon participates in covalent bonding where it is covalently bonded to four other chemical species using its four outermost electrons. Carbon forms covalent bonds in which four electrons are shared with other chemical species.

Answer:

It is the site where oxygen combines with small molecules of glucose and releases large amounts of energy

Explanation:

Answer:

A.Mid ocean ridge i think

Explanation:

your answer is B my guy

Answer:

d.

Explanation:

The Formation of these mountains will be caused by

Options B, C, and D is correct.

Generally, a mountain is simply defined as a body that rises dramatically above its surroundings and is distinguished by steep slopes.

In conclusion, Mountains are formed from the formation of rocks over years in an Environment.

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Answer:

the answer is Energy will be exchanged, but matter will not be exchanged.

this because that in a closed system energy is able to be transfered but matter cant.

hope this helps

Answer:

b

Explanation:

none

Answer:

Ammonia, NH3, is a chemical compound composed of one nitrogen atom and three hydrogen atoms.

Explanation:

i hope this will help you :)

Answer:

3H2 + N2 ---> 2NH3

Explanation:

3H2           +      N2 --->      2NH3

Hydrogen + Nitrogen         Ammonia​

Answer:

3Hg(OH)2 + 2H3PO4 → Hg3(PO4)2 + 6H2O

Answer:

There are [tex]1.202\times 10^{24}[/tex] atoms and [tex]1.502\times 10^{23}[/tex] molecules in the compound.

Explanation:

The molar mass of the sulphur is [tex]32.065\,\frac{g}{mol}[/tex]. The Avogradro's Law states that exists [tex]6.022\times 10^{23}\,\frac{atom}{mol}[/tex]. The quantity of atoms in a quantity of mass is derived from dividing the mass by the molar mass and multiplying it by the Avogadro's Number. That is:

[tex]n_{atom} = m_{S}\cdot \frac{n_{A}}{M_{S}}[/tex]

Where:

[tex]m_{S}[/tex] - Mass of the sample, measured in grams.

[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.

[tex]M_{S}[/tex] - Molar mass of the sulphur, measured in grams per mole.

If [tex]m_{S} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{atoms}{mol}[/tex] and [tex]M_{S} = 32.065\,\frac{g}{mol}[/tex], then:

[tex]n_{atom} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{atoms}{mol} }{32.065\,\frac{g}{mol} }\right)[/tex]

[tex]n_{atom} = 1.202\times 10^{24}\,atoms[/tex]

There are [tex]1.202\times 10^{24}[/tex] atoms in the compound.

Now, the molecular weight of the compound is:

[tex]M_{S_{8}} = 8\cdot \left(32.065\,\frac{g}{mol} \right)[/tex]

[tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex]

The quantity of molecules in a quantity of mass is derived from dividing the mass by the molecular weight and multiplying it by the Avogadro's Number. That is:

[tex]n_{molecule} = m_{S_{8}}\cdot \frac{n_{A}}{M_{S_{8}}}[/tex]

Where:

[tex]m_{S_{8}}[/tex] - Mass of the sample, measured in grams.

[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.

[tex]M_{S_{8}}[/tex] - Molecular weight of the compound (octosulphur), measured in grams per mole.

If [tex]m_{S_{8}} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{molecules}{mol}[/tex] and [tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex], then:

[tex]n_{molecule} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{molecules}{mol} }{256.52\,\frac{g}{mol} }\right)[/tex]

[tex]n_{molecule} = 1.502\times 10^{23}\,molecules[/tex]

There are [tex]1.502\times 10^{23}[/tex] molecules in the compound.

Answer:

D. NH3

Explanation:

Hydrogen bonding exists only between hydrogen atoms, and is one of the strongest intramolecular forces. So you eliminate your choices down to B and D. HCl can't form Hydrogen bonding because of electron density and electronegativity but NH3 can, so your answer would be D.

Answer: kerosene, coal

Explanation:

These are renewable resources obtained from petroleum, kerosene was used in olden times to light the lamps and are still used today for lighting purposes. Coal was used in trains to produce steam( steam powered trains).

Answer:

Fuel Oil and Kerosene Oil are used as fuel. They are an important part of our life. Kerosene Oil is primarily used in the laboratory. Fuel Oil is used in power stations.

Answer:

We can distinguish between ethanol and ethanoic acid by reacting them with a metallic carbonate like Na2CO3 or a bicarbonate like NaHCO3 ....... ethanoic acid reacts to give to give CO2 and no reaction takes place in case of ethanol.

Answer:

D. It will continue moving in a straight line.

Explanation:

When Fredo takes a ball and tosses it into space, the ball will move upward infinitely.

Gravity is the downward force that acts on an object.

Without gravity, or without the effect of gravity, an object will continue to move in its path with the original direction applied to it.

Answer:

D

Explanation:

I took the test

Answer:

Molarity of the glucose solution = 2.72 mol/L

Explanation:

Molality of a solution is defined as the number of moles of solute per kilogram of solvent.

Therefore , a 2.27 molal solution of glucose contains 2.27 moles of glucose in 1 Kg of solvent

Density of solution = 1.20 g/mL

The volume occupied by 1 Kg or 1000 g solution = mass/density

Volume of 1000 g solution = 1000 g/1.20 g/ml = 833.3 mL

Number of moles of glucose present in the solution = 2.27 moles

Molarity = number of moles / volume(L)

volume of solution in litres = 883.3/1000 = 0.8333 L

Molarity = 2.27 moles /0.8333 l = 2.72 mol/L

Therefore, molarity of the glucose solution = 2.72 mol/L

The molarity of the glucose in the solution has been 2.72 mol/L.

Molality can be defined as the moles of the solute per kg of solvent.

The molality of glucose solution = 2.27 m

2.27 moles of glucose in 1000 grams of water.

Density has been the mass per unit volume. The density can be expressed as:

Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]

The density of the given glucose solution = 1.20 g/ml

The volume of 1000 grams of water has been:

Volume = [tex]\rm \dfrac{Mass}{Density}[/tex]

Volume of 1000 grams water = [tex]\rm \dfrac{1000\;g}{1.20\;g/ml}[/tex]

Volume of 1000 g water = 833.3 ml

The molarity can be defined as the mass of solute per liter of the solution.

Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{Volume\;(ml)}[/tex] ......(i)

The moles of glucose in the 833.3 ml solution have been 2.27 mol.

Substituting the values in equation (i):

Molarity = 2.27 mol [tex]\rm \times\;\dfrac{1000}{833.3\;ml}[/tex]

Molarity = 2.72 mol/L.

The molarity of the glucose in the solution has been 2.72 mol/L.

For more information about the molarity of the solution, refer to the link:

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Answer:

121.67 g is to be added to 500 g of water

Explanation:

Given that:

Pressure = 750 mmHg

Temperature T₁= 99.63⁰C = (273 + 99.63 ) = 372.63K

mass of water = 500 g

Temperature T₂  = 100⁰C = ( 273 + 100) K = 373 K

where;

Kb for water 0.52 K Kg mol-1

For sucrose; C₁₂ H₂₂ O₁₁

Molar mass =  ( 12 × 12 )+ ( 1 × 22 ) + ( 16 × 11 )

Molar mass = 342 g/mol

ΔT = T₂  - T₁

ΔT = (373 - 372.63)K

ΔT = 0.37 K

∴ the amount of sucrose to be added to  500 g of water is:

 [tex]= \dfrac{0.37\times 342 \times 500}{0.52 \times 1000 }[/tex]

[tex]= \dfrac{6327}{52}[/tex]

= 121.67 g

Thus; 121.67 g is to be added to 500 g of water

Answer:

Mira la explicación.

Explanation:

¡Hola!

En este caso, podemos encontrar facilmente el grupo al que pertenecen dichos elementos con números atómicos 8, 36 y 39 respectivamente mediante su búsqueda en la tabla periódica. Así, z=8 corresponde a oxígeno, z=36 a kriptón y z=39 a itrio.

Por otro lado, para saber el número de capas, debemos desarrollar la configuración electrónica para cada uno:

[tex]O: 1s^2,2s^2,2p^4\\Kr: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6\\Y:1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6,5s^2,4d^1[/tex]

Con esto, vemos que oxígeno tiene dos capas, kripton cuatro capas e iritrio cinco, a lo que a oxígeno le faltan dos electrones para llenar dicha capa, a kripton ninguno y a iritrio nueve.

Saludos.

Answer:

C3H8 + 5 O2 ------> 3 CO2 + 4 H2O

Explanation:

Answer:

Side photo

A small still is separating propane and butane at 135 °C, and initially contains 10 kg moles of a mixture whose composition is x = 0.3 (x = mole fraction butane). Additional mixture (x = 0.3) is fed at the rate of 5 kg mole/hr. The total volume of the liquid in the still is constant, and the concentration of the vapor from the still (xp) is related to x, as follows: Xp = How long will it take for X, to change from 0.3 to 0.35.

Answer: A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.

Explanation: Heat and Temperature do not mean the same thing. ... A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.

Answer:

e< d< b< c=f< a

Explanation:

Quantum numbers refers to values that exactly describe the energy of electrons within an atom or a molecule. Electrons are known to possess a set of four quantum numbers used in describing the energy state of such electron. These quantum numbers are solutions to the Schrödinger wave equation for the hydrogen atom.

In describing any electron within the atom, the relevant set of four quantum numbers are: principal quantum number (n), orbital, azimuthal, subsidiary or angular momentum quantum number (l), magnetic quantum number (ml), and spin quantum number (ms).

In the arrangement above, the electrons are arranged in order of increasing energy. Each arrangement of quantum numbers corresponds to a particular energy state of the electron.

Answer:

I believe its the 4th one. He goes to give Romeo the message but before he is able to, Balthasar tells Romeo that Juliet is dead. Friar John just wasn't there in time.

Answer:

D) he fails to give Romeo an important letter

Explanation:

i took the test. edge 2020

Answer:

The correct option is desertification

Explanation:

Deforestation is the deliberate act of pulling down trees to provide a clear land for space or to make use of the trees for other purposes  such as grazing, farming, timber fire wood, building and constructions, urban utilization, access roads, expansion, development of infrastructures, grazing of cattle and mining

The effects of deforestation includes climate change, flooding, increase in the proportion of green house gases in the atmosphere, soil erosion and desertification.

A negative effect of deforestation is desertification.

Deforestation refers to the cutting down of trees. There are many reasons why people may cut down trees. One of the popular reasons why people cut down trees is to obtain timber which is used for construction and as fuel.

An important consequence of the felling of trees also called deforestation is that a once fertile land may gradually be turned into a desert area. This is known as desertification.

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Answer:

The answer will result in one significant digit.

Explanation:

1. Subtract:

     12.1 - 12.004 = 0.096

2. ROund to the correct number of significant digits:

      For addition and subtraction we round the sum or the difference to the least number of digits after the decimal point there are in the problem.  

      For example, SInce 12.1 has one number after the decimal point and 12.004 has three numbers after the decimal point, we round the answer to one number after the decimal point because 12.1 is the number in the problem which has the least amount of digits after the decimal point.

     We round 0.096 to 0.1.

     0.1 has one significant digit.

Answer:

Valency of Chlorine is 1 because it needs 1 electron to complete its octet (a shell of eight electrons). Valency is defined as "The combining power of an element" and Since, chlorine needs 1 electron to complete its valence shell, Its valency is 1.

Answer:

d. solar winds

Explanation:

Dr. Tate and Dr. Ramirez are observing solar winds coming from the sun. Solar winds occurs naturally in which the particles such as electrons and photons releases from the surface of the sun into the space. These solar winds moves in the solar system and interact with planets of the solar system. Dr. Tate and Dr. Ramirez are the two well known scientist observing the effects of solar winds that has reached the planet Jupiter.

Answer:

A

Explanation:

The reason it is distillation is due to the fact that we can use distillation to heat the ocean water. As water has a lower boiling point than the salt solution, it evaporates and the salt stays behind.

Explanation:

The value of equilibrium constant doesn't change when a catalyst is added.

Equilibrium constant depends on Concentration of reactants , Pressure and Temperature.

A suitable catalyst can improve the reaction rate. A catalyst is a material that increases the rate of a chemical reaction, but in the end, it remains unchanged chemically. It offers a lower energy alternative reaction path.

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Molecules of glucose (blood sugar) contain 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

Hope this helped :)