What is the molecular weight of H2O

Answer:

Explanation:

Given pinene has a (temperature, vapor pressure) relation (K, torr) = {(373, 135), (429, 760)}, you want the heat of vaporization in kJ/mol and the vapor pressure at room temperature (23 °C).

The Clausius–Clapeyron equation can be used to find the heat of vaporization:

  [tex]\ln{P}=-\dfrac{\Delta H_{\text{vap}}}{R}\left(\dfrac{1}{T}\right)+C[/tex]

Solving for ∆H, we find ...

  [tex]\Delta H_{\text{vap}}=-\dfrac{R\cdot\ln{\dfrac{P_1}{P_2}}}{\dfrac{1}{T_1}-\dfrac{1}{T_2}}\\\\\\\Delta H_{\text{vap}}=-\dfrac{8.314\cdot\ln{\dfrac{760}{135}}}{\dfrac{1}{429}-\dfrac{1}{373}}\approx 41052.8[/tex]

The heat of vaporization of pinene is about 41 kJ/mol.

Rearranging the above equation to give P1, we have ...

  [tex]\ln{\dfrac{P_1}{P_2}}=-\dfrac{\Delta H_\text{vap}}{R}\left(\dfrac{1}{T_1}-\dfrac{1}{T_2}\right) \\\\\\P_1=P_2\cdot e^{-\frac{\Delta H_\text{vap}}{R}\left(T_1^{-1}-T_2^{-1})}[/tex]

Using the same P2 and T2 as above, we find the vapor pressure at room temperature (296.15 K) to be ...

  P1 ≈ 4.349 . . . . . torr

The vapor pressure of pinene at room temperature is about 4 torr.

Answer:

a whole new world too be into

Explanation:

In solid carbon dioxide (dry ice), the particles are held together by strong covalent bonds, so they do not move around much.

What is the carbon dioxide?

Carbon dioxide (CO2) is an odorless, colorless gas created through natural processes such as respiration, combustion and the breakdown of organic materials. As a greenhouse gas, it is a major component of the Earth’s atmosphere and plays a critical role in regulating the global climate. Carbon dioxide is made up of one carbon atom and two oxygen atoms, and is produced when fossil fuels such as coal and oil are burned. Plants and trees also use carbon dioxide as part of their photosynthesis process. Carbon dioxide is essential for life on Earth, however, too much of it can have a negative impact on our planet. As human activity has increased over the past century, so too has our production of CO2, resulting in higher concentrations of this gas in the atmosphere and contributing to global warming.

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Sublevels are indicated by letters s, p, d, and f.

How do write Electronic configuration?

Electron configurations have a standard notation that tells you the principle energy levels and sublevels that electrons occupy. here is Sulphur:

The atomic number of Sulphur is 16.

the electronic configuration of Sulphur is 1s2 2s2 2p6 3s2 3p4.

The 4s sublevel has lower energy than the 3d sublevel,

so, it fills next.

One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. According to its location on the periodic table, each element's electron configuration is distinct.

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Answer:

it should be chlorine gas

Explanation:

Explanation:

This hot material rises to an area of lower pressure through the process of convection. Areas of lower pressure always have a lower melting point than areas of high pressure. This reduction in overlying pressure, or decompression, enables the mantle rock to melt and form magma.

According to the ideal gas law, 4.30 molecule of o2 occupies 0.11 m³ at 99.7 kPa with 35.0 °C.

The relationship between a gas's pressure P, volumes V, and t in the range between low pressures and extremely high temperatures, when the gas's water moves virtually independently of one another, is known as the ideal gas, also known as the perfect gas law.

PV = nRTp = pressure in PaV

= volume in m³n = number of molesR

= molar gas constant (8.31 JK⁻¹mol⁻¹)T

= temperature in Kpressure ⇒ 99.7 × 10³ Pa

temperature ⇒ 35.0 + 273 = 308

KpV = nRT

= 99.7×10³×V= 4.30×8.31×308V

=(4.30×8.31×308)/(99.7×10³3 )V

= 0.11 m­³

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Answer:

Osmosis is taking place in the vessel, where a 10% solution of sodium chloride is on one side of the semipermeable membrane and a 2% solution of sodium chloride is on the other side. Osmosis is a special case of diffusion, where water moves from an area of higher concentration to one of lower concentration. In this case, water will move from the 10% solution to the 2% solution, as it has a higher solute concentration. This process is known as osmoregulation and it involves maintaining salt and water balance across membranes within the body’s fluids. The key to remember about osmosis is that water flows from the solution with the lower solute concentration into the solution with higher solute concentration. As such, in this case, water will flow from the 2% solution to the 10% solution.

Explanation:

a) 1 - Trigonal planar 2 - Trigonal planar

b) 1- Linear  2 - Tetrahedral  3 - Tetrahedral

c) 1 - Trigonal planar 2 - Tetrahedral

We have to know that the shapes at the various carbon atoms and other atoms would depend on the number of the electron pairs and the hybridization of the atom.

We must have to note that the shape of the atom can be found on the basis of the valence shell electron pair repulsion theory which deals with the arrangement of that electrons around the outermost shell of the central atom.

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Natural vegetative propagation uses bulbils, aerial shoots, roots, underground stems, and subaerial stems. Utilizing unique vegetative components, artificial vegetative propagation is accomplished.

The production and growth of a new plant through asexual means or from a plant fragment is known as vegetative propagation. There is no gamete production or fertilization throughout the process of propagation.

In this procedure, tubers—modified roots—grow into new plants. In some plant species, adventitious buds even grow on the roots. If the correct circumstances are present, these buds develop into new plants or sprouts. Sweet potato and dahlia are two examples.

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Answer: I believe its two

Explanation:

Answer:

The answer is lithium bromide because it is the combination of a metal (lithium) and a nonmetal (bromine). The indicator that this is the correct name, rather than lithium bromate, is that the compound is composed of only two elements and does not contain oxygen. Yes, this is why NaNO3 is Sodium Nitrate; it is composed of three different elements (sodium, nitrogen, and oxygen).

Explanation:

Answer:

The answer is the last one only.

Explanation:

Light/sun gives energy and growth which makes the plants leaves/plant grow bigger.

Explanation:

Without the sun, plants wouldn't get the food that's needed to grow, reproduce and survive. plants need sunlight, water and carbon dioxide to live.

The variables that might affect the investigation while dissolving different masses of salt are temperature and mass of the salt.

A variable that changed during the inquiry is regarded as an independent variable and is called "mass of salt dissolved in water." While the investigation's dependent variable, "boiling point of salt solution," is a variable that was monitored.

There are numerous things that can be changed to see how they affect other things. Variables are the changeable quantities. Any element, character trait, or condition that can exist in a variety of forms or concentrations is a variable. Independent, dependent, and controlled variables are the three types of variables that often make up an experiment.

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Neera and Tom dissolved different masses of salt in 500 cm3 of water.

They measured the temperature at which each salt solution boiled.

(a) They wrote down the variables that might affect the investigation.

(i) What is the independent variable (the variable they changed) in

their investigation?

(ii) What is the dependent variable (the variable they measured) in

their investigation?

(iii) Which variable above would affect the experiment the least?

There is a golden rule of solubility, non polar solute dissolve in non polar solvent and polar solute dissolve in polar solvent. Therefore, the correct option is option B.

Solution is a homogeneous mixture of two or more than two substances. A solution is a homogeneous mixture of solute and solvent molecules. Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution.

There are two types of mixture that is homogeneous and heterogeneous. Solution is a homogeneous solution. The nature of solvent tells about whether the solvent is in liquid, solid or gas form.

Let amount of 30% to mix, be X

Then amount of 18% to mix = 300 - X

0.3X + 0.18(300 - X) = 0.21(300)

0.3X+ 0.18(300) - 0.18X= 0.21(300)

0.3X - 0.18X =0 .21(300) -0 .18(300)

0.12X =0 .03(300)

X=75L

Therefore, the correct option is option B.

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The volume of acid required to prepare 8dm3 of 0.5moldm-3 solution of the compound is 203 cm3.

Volume is the amount of space that an object or substance occupies. It is typically measured in cubic units, such as metres cubed (m³). Volume is an important concept in mathematics, physics, and engineering. Volume plays an important role in everyday life; for example, the volume of water in a swimming pool can be measured to determine how much water needs to be added or subtracted. Volume is also used to measure the amount of a substance, such as oil or gas. The volume of a container can also be used to measure the amount of material contained within it. Volume can also be used to measure the capacity of a container, such as a bucket or a tank. In addition, volume can be used to calculate the mass of an object by measuring its density.

The mass of acid required to prepare 8dm3 of 0.5moldm-3 solution of the compound is:
M = 8 x 0.5 x 98 = 392 g
The volume of acid required to prepare 8dm3 of 0.5moldm-3 solution of the compound is:
V = 392 / (1.84 x 0.97) = 203 cm3
Therefore, the volume of acid required to prepare 8dm3 of 0.5moldm-3 solution of the compound is 203 cm3.

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The mass of 65% and 20% nitric acid that must be mixed to produce 4.5 kg of 30% nitric acid are 1.306 kg and 3.189 kg respectively.

The volume of 4.5 kg of 30% nitric acid is determined using the formula below:

The density of 30% nitric acid is 1.18 g/mL

The mass of the  30% nitric acid is 4.5 kg or 4500 g

Hence, the volume will be:

The volume of 30% nitric acid = 4500 / 1.18

The volume of 30% nitric acid = 3813.56 mL

The volume of 65% and 20% nitric acid required is then determined.

Let the volume of the 65% and 20% nitric acid be x and y respectively;

x + y = 3813.56 ---(1)

amount of acid in 3813.56 ml solution = 30% * 3813.56

amount of acid in 3813.56 ml solution = 1144.07 mL

therefore;

60% * x + 20% * y = 1144.07 mL

0.6x + 0.2y = 1144.07 ----(2)

Solving for x and y in the two equations

From (1), x = 3813.56 - y

Substitute x = 3813.56 - y in (2)

0.6(3813.56 - y) + 0.2y = 1144.07

0.4y = 1144.07

y = 2860.18 mL
x = 3813.56 - 2860.18

x = 953.38 mL

The mass of the acids required is then determined as follows:

The density of 60% nitric acid is 1.37 g/mL

Mass of 60% nitric acid required = 953.38 mL * 1.37 g/mL

Mass of 60% nitric acid required = 1306 g or 1.306 kg

The density of 20% nitric acid is 1.115 g/mL

Mass of 20% nitric acid required = 2860.18 mL * 1.115 g/mL

Mass of 20% nitric acid required = 3189 g or 3.189 kg

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The mass of [tex]IF_5[/tex] that would be in a 15.88 L sample at 378 K and 0.935 will be 106.51 grams.

The problem can be solved by first using the ideal gas equation to know the number of moles of the gas that is present.

PV = nRT

P = 0.935, V = 15.88 L, T = 378 K, R = 0.082

Making n the subject of the formula:

n = PV/RT

  = (0.935x15.88)/(0.082x378)

   = 0.48 moles of the gas

Recall that, mass = mole x molar mass

The molar mass of [tex]IF_5[/tex] is 221.89 g/mol

Mass of 0.48 moles [tex]IF_5[/tex] = 0.48 x 221.89

                                       = 106.51 grams

In other words, the mass of [tex]IF_5[/tex] that would be in a 15.88 L sample at 378 K and 0.935 is 106.51 grams.

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Answer:

oxygen-16 is a stable isotope of oxygen, having 8 neutrons and 8 protons in its nucleus. It has a mass of 15. u

Electrons first occupy the position in lowest possible energy.

orbital diagrams:-

The higher the energy level, the Third energy the electrons in that level have. On the orbital diagram, fill in the boxes to label the representations of an orbital and a sublevel.   2   electrons can occupy a single orbital, and these electrons have Opposite spin. Within a sublevel, all the orbitals fill with one electron, each of which has the Positive spin before a second electron fills any of the orbitals.

what is Orbital?

Each energy position is made up of areas known as an orbital. An orbital is an area of probability in which electrons can be set up. Each energy position, except for the first, has further than one orbital. Each orbital has a specific shape.

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The boiling points increase down the group.Thus, option C is the answer.

Group 0, also known as the noble gases, is a group of chemical elements in the periodic table. These elements are all characterized by having a full valence shell of electrons, which gives them little tendency to gain or lose electrons and makes them generally unreactive. As a result, the elements in Group 0 are not very reactive and do not form many compounds.

The boiling points of the elements in Group 0 generally increase as you go down the group. This trend is due to the increasing atomic radius of the elements as you go down the group. The larger the atomic radius, the more space there is between the atoms in a substance, and the more energy is required to overcome the attractive forces between the atoms. This results in a higher boiling point.

In contrast, the relative atomic masses (Ar) of the elements in Group 0 generally decrease as you go down the group. This is because the atomic radius increases as you go down the group, but the number of protons in the nucleus (and therefore the atomic mass) does not change significantly. As a result, the relative atomic mass decreases as the atomic radius increases.

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Answer:

Explanation:

1) The following balanced chemical equations are for based on the combustions of various fuels. Calculate the heats of combustion for each reaction a. C₂H₂OH + ...

Answer:

Clastic or detrital sedimentary rocks are made from pieces of bedrock, sediment, derived primarily by mechanical weathering.

Explanation:

Answer:

A glove is like the earth because...

A globe is like the earth in that it is a three-dimensional representation of the earth's features, such as countries, oceans, and landmasses.

A globe is also like the earth in that it can rotate on its axis, which allows the viewer to see different parts of the earth depending on the angle of rotation.

A globe is not like the earth because...

A globe is not like the earth in that it is typically much smaller than the earth.

A globe is also not like the earth in that it does not depict the earth's relief features, such as mountains and valleys, in their true proportion to the rest of the earth's surface.

A globe is like the earth in that it is a scaled-down, spherical model of the earth's surface, representing physical features accurately. However, a globe is not like the earth because it is much smaller and does not rotate or revolve.

The globe and the earth are similar in two main ways. First, a globe is a scaled-down model of the earth, showing an accurate representation of the earth's surface. This includes physical features such as continents, oceans, and countries, which are mapped out precisely. Second, a globe is spherical, just like the earth.

However, there are differences between a globe and the earth. One key difference is the scale: the earth is far larger than any globe. The most obvious point of difference is the size: while a globe is small enough to be held in your hands or placed on a desk, the earth has a diameter of approximately 7,917.5 miles. Also, the globe is a static object, it does not rotate on its axis or revolve around the sun like the earth does.

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Considering the definition of molality, the molality of the KCl in the solution is 6.56 moles/kg.

Molality, or molal concentration, is the amount of a substance dissolved in a given mass of solvent. It is defined as the moles of a solute per kilogram of solvent.

The Molality of a solution is determined by the expression:

molality= number of moles of solute÷ kilograms of solvent

In this case, you know:

Replacing in the definition of molality:

Molality= 1.41 moles÷ 0.215 kg

Molality= 6.56 moles/kg

The molality of the solution is 6.56 moles/kg.

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Natural radioactive elements are those that spontaneously radiate in nature and have an atomic number between 82 and 92. In dirt, air, water, rocks, plants, food, uranium—a radioactive element—can be discovered.

When an element's atoms contain excess neutrons or protons, the extra energy produced in the nucleus causes the atom to lose its equilibrium or become unstable. if and how radioactive particles can become stable. Radiation is produced by radioactive atoms' unstable nuclei.

Compared to beta and gamma particles, alpha particles represent the most dangerous internal threat. The most hazardous methods of exposure to radioactive elements that release alpha and beta radiation are ingestion, inhalation, absorption, and injection. Gamma radiation is the outside hazard that causes the most damage.

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Based on the formula to determine the freezing point depression of the solvent, the freezing point of the solution is 263.85 K.

The freezing point of a substance is the temperature at which the liquid changes to solid without any further decrease in temperature occurring during the process.

The addition of solute substances in liquids usually lowers the freezing point of the liquid solvent.

The formula to determine the freezing point depression of solvent is given below:

where'

The molality of the given solution = moles of solute/kg of solvent

moles of solute = 46/92

mass of solvent = 100 g or 0.1 kg

Molality of solution = (46/92) / 0.1

Molality of solution = 5

for glycerine, i = 1

ΔT = ΔT = 1 * 1.86 * 5

ΔT = 9.3

The freezing point of the solution = 273.15 - 9.3

The freezing point of the solution = 263.85 K

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Answer:

Option d) 3 only is the right answer