Inafred frequency compared to other in the EMS

Answer:

For 1: 12.0 moles of water will contain \(7.2264\times 10^{24}\) number of molecules

For 2: The given amount of water molecules will be present in 5.41 moles of water.

Explanation:

According to the mole concept:

1 mole of a compound contains \(6.022\times 10^{23}\) number of molecules

We are given:

Moles of water = 12.0 moles

Using above concept:

If 1 mole of a compound contains \(6.022\times 10^{23}\) number of molecules

So, 12.0 moles of water will contain = \((12.0\times 6.022\times 10^{23})=7.2264\times 10^{24}\) number of molecules

Hence, 12.0 moles of water will contain \(7.2264\times 10^{24}\) number of molecules

We are given:

Molecules of water = \(3.26\times 10^{24}\) molecules

Using above concept:

If \(6.022\times 10^{23}\) number of molecules are present in 1 mole of a compound

So, \(3.26\times 10^{24}\) number of molecules will be present in = \(\frac{1mol}{6.022\times 10^{23}}\times 3.26\times 10^{24}=5.41\) moles of water

Hence, the given amount of water molecules will be present in 5.41 moles of water.

The question requires us to calculate the average atomic weight of bromine, given this element isotope masses and their abundance.

The following information was provided by the question:

number of isotopes of Br = 2

mass of isotope 1 = m1 = 78.9183 amu

abundance of isotope 1 = f1 = 50.69%

mass of isotope 2 = m2 = 80.9163 amu

abundance of isotope 2 = f2 = 49.31%

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (we use the decimal number associated with the abundance for the isotope; for example: if the abundance is 75%, we use 0.75).

Therefore, to calculate the average atomic mass of Br, we'll use the following equation:

where m refers to the isotope mass and f, to its natural abundance.

Applying the values provided by the problem, we have:

Therefore, the average atomic weight of bromine is 79.90 amu.

The number of moles of the gas by the ideal gas law is 0.18 moles.

The behavior of an ideal gas, a hypothetical gas made up of randomly moving particles with little volume and no intermolecular interactions, is described by the ideal gas law.

Although intermolecular interactions and non-zero particle volume prevent gases from always behaving in an ideal manner, the ideal gas law is nevertheless a good approximation for many gases under some circumstances.

We know that;

PV = nRT

We have ;

P = 1.2 atm

V = 3.4 L

T = 10 + 273 = 283 K

n = ?

n = PV/RT

n = 1.2 * 3.4/0.082 * 283

n =4.08 /23.2

n = 0.18 moles

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Answer:

Second answer may be 4Al +3O2 gives 2Al2O3

Answer:

yes and only upto 2 electrons and very strongly they hold

Answer:

I think the answer is two

Explanation:

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.

You get it

Answer:

yes? is there a question...

Explanation:

Answer:

24 hours

Explanation:

Earth spins on its axis once in every 24-hour day. At Earth's equator, the speed of Earth's spin is about 1,000 miles per hour (1,600 km per hour).

Answer:

coefficient

Explanation:

It a part of the equation

Answer:

0.8853 mL

Explanation:

First we convert 13 lb to kg, keeping in mind that 1 lb = 0.454 kg:

Then we calculate how many mg of acetaminophen should be given, using the recommended dose and infant mass:

Finally we calculate the required mL of suspension, using its concentration:

Answer:

No. Moles  = 2.142   mole

True;

The earth is currently in an interglacial period

Climate has changed naturally over the earth's history

False

The increase since 1860 is similar to previous increases

Atmospheric composition have remained the same throughout earth history.

Atmospheric carbon dioxide has increased significantly since 1860, primarily due to human activities such as burning of fossil fuels and deforestation.

There are also seasonal variations in CO2 concentrations, with higher concentrations in the winter months and lower concentrations in the summer months. This is because the majority of the world's vegetation is in the Northern Hemisphere, and during the winter months, there is less photosynthesis occurring to remove CO2 from the atmosphere.

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a) The rate of the reaction in terms of the change in concentration of each of the reactants and products will be: -d[HBr]/dt or -d[Br2]/dt or d[H2]/dt

b) The average rate of the reaction will be 0.00352 M/s

c) = 0.0352 M amount of Br2(in moles) was formed during the first 15.0s of the reaciton.

a) The rate of a reaction can be expressed as the change in concentration of a reactant or product over time.

For this reaction, the rate could be expressed as:

-d[HBr]/dt or -d[Br2]/dt or d[H2]/dt

b) To calculate the average rate of the reaction, we can use the formula:

average rate = (change in concentration of HBr) / (change in time)

where the change in time is 25.0 s and the change in concentration of HBr is 0.600 M - 0.512 M = 0.088 M.

average rate = 0.088 M / 25.0 s

= 0.00352 M/s

c) To calculate the amount of Br2 formed during the first 15.0s of the reaction, we need to multiply the average rate of the reaction by the change in time:

amount of Br2 = average rate * change in time

amount of Br2 = 0.00352 M/s * 15.0 s = 0.0528 moles

Since the volume of the reaction vessel is 1.50 L, we can find the concentration of Br2:

[Br2] = amount of Br2 / volume

[Br2] = 0.0528 moles / 1.50 L

= 0.0352 M

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One can either conclude that the rope rotted quicker due to the presence of a higher concentration of salt in the ocean or that there is not enough information to make a conclusion. Options B and D.

From the available data in the table, it took the rope 10 years to rot in a lake water. Whereas, it took the rope 4 years to rot in an ocean water.

Also from the table, the average concentration of salt in the lake water is almost zero, whereas, the average concentration of salt in the ocean water is high.

Two things can be inferred from this reaction:

In order to accept the first inference, we will assume that all other factors have been examined and kept constant except the concentration of salt in the two water bodies. This will also include that the same size of rope was used in the two water bodies.

Without the assumptions made in the first inference, there is not enough information to arrive at a specific conclusion.

Thus, both B and D are plausible options.

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Answer: 307.923

Explanation: Im not sure but thats my best guess. :p

Answer:

Elements

Explanation:

Out of the options given, the expression that represents the ideal gas behavior is:

The ideal gas law is expressed by the formula PV = nRT,

where

P is the pressure,

V is the volume,

n is the number of moles of gas,

R is the gas constant, and

T is the temperature.

By rearranging this equation, we can derive different expressions for the ideal gas behavior in terms of the pressure, volume, and temperature.

This can be obtained by rearranging the ideal gas law equation as follows:

PV = nRT

Dividing both sides by nT, we get:

P × V / (nT) = R

Since R is a constant for a given gas, the left-hand side of the equation must also be constant for an ideal gas. Thus, the expression P × V / T represents the ideal gas behavior.

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Answer:

The charge of cobalt in the salt is + 2.

Explanation:

The charge of the salt = 0 . This is because it is neutral.

Charge of cobalt = ?

Charge of oxygen = -2 (This is a constant value, it is -2 only in peroxides)

Charge of salt = Charge of cobalt + Charge of oxygen

0 = x + (-2)

x = + 2

The charge of cobalt in the salt is + 2.

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns.

During El Niño years, Christchurch may experience cooler air temperatures due to several factors associated with the El Niño phenomenon.

El Niño is characterized by the abnormal warming of the surface waters in the eastern tropical Pacific Ocean, which has global climatic implications. While El Niño is primarily associated with changes in oceanic conditions, its effects can extend to atmospheric patterns, leading to altered weather patterns and temperature variations.

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns. El Niño can disrupt the normal global atmospheric circulation, resulting in changes in the positioning and intensity of weather systems.

This can lead to the advection of cooler air masses from the south or southeast towards Christchurch, resulting in cooler temperatures.

Another factor is the influence of El Niño on regional rainfall patterns. El Niño often leads to drier conditions in the South Island of New Zealand, including Christchurch.

Reduced cloud cover and less moisture in the air can contribute to cooler temperatures as there is less insulation from the sun's radiation and less evaporative cooling. Additionally, the absence of significant rainfall can result in less moisture in the soil, leading to cooler conditions as less energy is used for evaporation.

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Answer:

The more you get closer to a substance in the periodic table things that are included into the substance start to get bigger

Explanation:

Taking into account the definition of molarity and the stoichiometry of the reaction, the correct option is option C) 0.44 L of 6.9 M NaOH is needed to completely titrate 0.42 L of 2.39 M phosphoric acid.

The balanced reaction is:

H₃PO₄ (aq) + 3 NaOH (aq) → Na₃PO₄ (aq) + 3 H₂O(aq)

Then, by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Molarity is the number of moles of solute that are dissolved in a given volume.

Molarity is determined by:

\(Molarity=\frac{number of moles of solute}{volume}\)

 Molarity is expressed in units \(\frac{moles}{liter}\).

In this case, 0.42 L of 2.39 M phosphoric acid reacts. So, by definition of molarity, the number of moles that participate in the reaction is calculated as:

\(2.39 \frac{moles}{liter}=\frac{number of moles of phosphiric acid}{0.42 liters}\)

Solving:

number of moles of phosphiric acid= 2.39 \(\frac{moles}{liter}\)* 0.42 liters

number of moles of phosphiric acid= 1.0038 moles ≅ 1 mole

Approaching 1 mole of the amount of phosphoric acid required, then by stoichiometry of the reaction, 3 moles of NaOH are necessary to react with 1 mole of the acid.

Then by definition of molarity and knowing that 6.9 M NaOH is needed, you can calculate the necessary volume amount of NaOH by:

\(6.9 \frac{moles}{liter} =\frac{3 moles}{volume}\)

Solving:

6.9 \(\frac{moles}{liter}\)* volume= 3 moles

\(volume=\frac{3 moles}{6.9\frac{moles}{liter} }\)

volume= 0.44 L

The correct option is option C) 0.44 L of 6.9 M NaOH is needed to completely titrate 0.42 L of 2.39 M phosphoric acid.

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The number of millimoles of acetate (the conjugate base of acetic acid) needed is 3162.28 mmol

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

pH = pKa + Log[conjugate]/[acid]

From the question given above, the following data were obtained:

pH = pKa + Log[conjugate]/[acid]

5.09 = 4.74 + Log[conjugate]/ 10

Collect like terms

5.09 - 4.74 = Log[conjugate] / 10

0.35 = Log[conjugate] / 10

Cross multiply

Log[conjugate] = 0.35 × 10

Log[conjugate] = 3.5

Take the anti-log

[conjugate] = anti-log 3.5

[conjugate] = 3162.28 mmol

Thus, the number of millimoles of acetate (the conjugate base of acetic acid) needed is 3162.28 mmol

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Answer:

(A) Climate Change (B) Climate Change and Plant Communities (C) Effect on Sea Levels (D) Reduction of Biodiversity (E) Effect on Agriculture (F) Effect on Arctic Ecosystems (G) Overall Effect.

Explanation:The increase in temperature will be greatest at high latitudes and over large continents. Climatic changes as a result of global warming will naturally affect the biotic communities on this earth. Rising temperatures will cause glaciers to melt and the polar ice caps to shrink. As mentioned above increased temperatures, inundation of some coastal biological communities and changes in the pattern of distribution of many species over a long period of time are likely to cause reduction in biodiversity in aquatic and terrestrial ecosystems. The global climate change may have important effects on agriculture. Global climate change will have profound effects on arctic ecosystems. The overall effect of global warming on world climate has many dimensions, some of which are discussed above. The natural greenhouse maintains the earth’s temperatures within the limits for physiological functions. But studies suggest that even a moderate increase in the average global temperature could result in significant changes in biotic communities including reduction in biodiversity both in terrestrial and aquatic ecosystems.

The answer is- Mass of chlorine present in 133.5 g of aluminium chloride = 106.5 g

Moles: The amount of atoms are usually expressed in moles. Mass of any substance can be calculated from its moles as-

\(Mass = Moles * molar\ mass\)

Write the chemical equation for the reaction between aluminium and chlorine.

\(2Al + 3Cl_{2}\)→\(2AlCl_3\)

Molar mass of aluminium chloride = \(Molar\ mass\ of\ Al + 3(Molar\ mass\ of Cl) = 27.0 + 3(35.5) =133.5\ g/mol\)

\(Mass\ of\ Cl\ = Moles\ of\ Cl * Molar\ mass\ of\ Cl = (3.0\ mole) * (35.5\ g/mol) =106.5\ g\)

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Answer:

48 g C

Explanation:

To find the grams, you need to (1) convert atoms to moles (using Avogadro's Number) and then (2) convert moles to grams (using atomic mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 2 sig figs to match the sig figs of the given value.

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

Atomic Mass (C): 12.011 g/mol

2.4 x 10²⁴ atoms C                   1 mole                       12.011 g
-----------------------------  x  --------------------------------  x  ---------------  =  48 g C
                                         6.022 x 10²³ atoms           1 mole

Answer:

In a climatological sense, dryness is a function of both annual rainfall and evaporation

Answer:

Option 4

Explanation:

In water molecule, oxygen has -2 charge on it while the hydrogen has +1 charge and one atom of oxygen combines with two hydrogen atoms. A hydrogen need only two electrons to complete its octet (one electron is its own the second electron is shared by oxygen) and a oxygen needs 8 electrons (It has six of its own and two are shared by two hydrogen atom).

Hence, option 4 is correct

Answer:

Option 2

It's more balanced than the others

The way the bonds are built will determine how they are oriented. Additionally, the relative orientation of bonds affects conformation. Dibromocyclohexane is used to study the conformation.

Having a few very notable exceptions, the general rule is that molecules with at least one stereocenter are chiral, while molecules with no stereocenters are achiral. In most circumstances, an easiest approach to determine whether a molecule is chiral or achiral is to seek for one or even more stereocenters.

Two substituent groups inside the same plane are regarded to be the cis isomer of cyclohexane (either equatorial or axial). Cis-1-methyl-4-hydroxymethyl cyclohexane is cyclohexane with a methyl group in the axial plane (-CH3)also the hydroxyl group (-OH).

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