What is the freezing point, in °C, of
a 0.66 m solution of C4H10 in
benzene?
FP (benzene) = 5.50 °C
K; (benzene) = 5.12 °C/m
[?] °C

Answer:

4.78 mol O2

Explanation:

Grams --> moles

Grams/molar mass = moles

153 g O2 / 32 g/mol O2 = 4.78125 (significant figures so round it up; the grams has 3 significant figures, so round it up) 4.78 mol O2

Answer:

use the percent as the abundance and multiply it by the atomic mass and add the values together

Explanation: idk but i got it from quizlet

We have that the % values  shown in the sim into a number you could use for your calculation of average  masses is given as

\(Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}\)

From the question we are told

If you assumed 100 total atoms in a sample, how could you relate the % values  shown in the sim into a number you could use for your calculation of average  masses?

Generally

We will consider  that the 100 total atoms  as the the atoms at  a 100 percent

The substance at a 100 atoms is to be calculated and is to be given as

Generally the equation for the  average atomic mass  is mathematically given as

\(Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}\)

Therefore

Now, the % values  shown in the sim into a number you could use for your calculation of average  masses is given as

\(Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}\)

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Intermolecular forces such as dipole-dipole forces, London dispersion forces exist between molecules. The state of matter of a substance at a given temperature is determined by the relationship between molecules.

Intermolecular forces of attraction is force of attraction that make two molecule come closer. Intermolecular forces of attraction is directly proportional to the electronegativity of the molecule.

At a given temperature, the state of any matter can be defined on the basis of presence of forces of attraction between the molecules of the matter.

Thus, the state of matter of a substance at a given temperature is determined by the relationship between molecules.

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Diatomic: Composed of two atoms. Polar: A bond with a negative end and a positive end. Nonpolar: A bond in which neither atom takes more than its share of electrons. Metallic: A type of bond that allows valence electrons to move freely among ions. Electronegativity: Determines what type of bond will form.

The ability of an atom or functional group to draw electrons to itself is known as electronegativity in chemistry.

Diatomic molecules consist only of two atoms, whether they are from the same or distinct chemical elements.

Since charges fluctuate, a momentary dipole moment occurs in a so-called nonpolar molecule at any given time if the charge arrangement is spherically symmetric when averaged across time.

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Answer:

3.769022740695677

Explanation:

Answer:We get 1.81×1024 water molecules... Explanation: We assess the molar quantity of water in the usual way... Number of moles=massmolar mass.

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Answer:

Aluminium

Potassium

Answer: Hydrogen

Sodium Magnesium Aluminium

Potassium Calcium Gallium

Rubidium Strontium Indium

Caesium Barium Thallium

Explanation:

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Explanation:

I) carbon dioxide

ii) nitrogen dioxide

iii) nitric acid

iv) sulphric acid

v) Potassium dichromate

vi) hexacyanoferrate (III) ion( not sure)

The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.

The addition of \(O_2(g)\) will shift the equilibrium towards the right side of the reaction and will consume \(Cl_2(g)\).

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Answer:

Interphase is the longest part of the cell cycle, this is when the cell grows and copies its DNA before moving into mitosis.

Explanation:

Answer:

Interphase

Explanation:

Answer:

A: fossils found on Earth

Explanation:

TOOK TEST

Answer:

7. Why is the d-block one energy level behind the s-block? Also, why would the f-block be so far behind?

me to

Explanation:

I'm not able to help you with your question

ω

A type of fossil fuel,known as Tar stands.

A fossil fuel is a hydrocarbon-containing material formed naturally in to  the Earth's crust from to the  remains of dead plants and animals and birds that is the  extracted and burned as thr  a fuel. The main fossil  fuels are mainly coal, oil, and natural gas.

Tar sands are a combination of clay, sand, water and bitumen, which is a heavy hydrocarbon. Like the  kerogen in oil shale, tar sands' bitumen can be upgraded to synthetic crude oil.

So answer is tar sands.

These include tar sands – deposits of moist sand and it is  clay with 1-2 percent  bitumen (thick and heavy are  petroleum rich in the  carbon and poor in the  hydrogen). These are the  removed by strip mining in the  (see section below on coal)

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Answer:

B

Explanation:

i hope this helps

Answer:

CH4 (g) and O2 (g) are both in the gaseous state, while CO2 (g) and H2O (g) are also in the gaseous state.

In the above reaction, the reactants are in the gaseous state, and the products formed are also in the gaseous state.

Every compound in a chemical reaction can be in any state of matter like solid, liquid, or gas. In the reaction of methane and oxygen, the initial state of the reactants is in the gaseous form. The chemical reaction of methane and oxygen is given by the equation CH4 (g) + 2 O2 (g) -> CO2 (g) + 2 H2O (g).Here, methane and oxygen are the reactants, and carbon dioxide and water are the products. Methane (CH4) and oxygen (O2) react together in the presence of a spark or heat to produce carbon dioxide (CO2) and water (H2O).In the reaction, the methane gas combines with oxygen gas, which causes the release of heat energy and forms carbon dioxide gas and water vapor. Methane gas is a colorless and odorless gas that burns cleanly and is one of the primary components of natural gas.

The oxygen gas required for the reaction is available in the atmosphere. Carbon dioxide is a colorless gas with a faint odor and taste and is a significant component of the Earth's atmosphere. Water is a colorless, odorless, and tasteless liquid that is essential to life.The state of matter of every compound in a chemical reaction can change depending on the conditions in which the reaction occurs. For instance, a substance that is in the solid state at a lower temperature may melt into a liquid or boil into a gas at a higher temperature. Similarly, a liquid may freeze into a solid or vaporize into a gas under different conditions.

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Explanation:

45.8 grams of Fe2O3*(1 mole/159.69 g)= moles of Fe2O3

moles of Fe2O3 *(3 moles of O2/2 moles of Fe2O3)=moles of O2

moles of O2*(32.0g of O2/1mole)= mass of O2

The enthalpy for the reaction, N\(_2\)(g) + 1/2 O\(_2\)(g) →N\(_2\)O(g) is +81.5. among all the given options, the correct option is option A.

The amount of heat inside a system is measured as enthalpy. This heat is used to cause a process to occur. Enthalpy is indeed a thermodynamic quantity since every system that involves heat is referred to be a thermodynamic system.

Additionally, it is important to remember that each system has a number of players. These individuals each have their own pressure and volume. We already know that the ratio of a system's pressure to its volume is constant.

N\(_2\)(g) + 1/2 O\(_2\)(g) →N\(_2\)O(g)

i)2 NH\(_3\)(g) + 3 N\(_2\)O(g) → 4N\(_2\)(g) + 3 H\(_2\)O(l) ∆H°/kJ= -1010 KJ

ii)4 NH\(_3\)(g) + 3 O\(_2\)(g)  → 2 N\(_2\)(g) + 6 H\(_2\)O(l) ∆H°/kJ = -1531 KJ

Multiply second equation with 4 and first equation with 2. Now substract third equation from fourth equation.

N\(_2\)(g) + 1/2 O\(_2\)(g) →N\(_2\)O(g)  ΔH=+81.5

Therefore, the enthalpy for the reaction, N\(_2\)(g) + 1/2 O\(_2\)(g) →N\(_2\)O(g) is +81.5.

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Answer:

1 mole weighs 40 g

Explanation:

If 0.1 mol of a substance, i.e 10% of a substance weighed 4 g,

then 10×10% ⇒ 100% of a substance, i.e, 1 mole weighs 4×10 = 40 g

∴ 1 mole weighs 40 g

The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.

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A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.

We must compute the empirical formula in order to ascertain the compound's chemical composition.

If we have 100 grams of the compound.

This suggests we have:

30.4 g of nitrogen

69.6 g of oxygen

Now, we have to convert the mass of each element to moles.

The molar mass of nitrogen (N) = 14.01 g/mol

the molar mass of oxygen (O)  =  16.00 g/mol.

Number of moles of nitrogen (N):

2.17 mol

Number of moles of oxygen (O):

4.35 mol

The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.

Moles N / moles O = 2.17 mol / 2.17 mol = 1.00

Moles O / moles O = 4.35 mol / 2.17 mol = 2.00

The ratio is approximately N₁O₂.

We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.

The molecular formula of the compound is NO₂.

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Answer:

Judges and justices serve no fixed term — they serve until their death, retirement, or conviction by the Senate. By design, this insulates them from the temporary passions of the public, and allows them to apply the law with only justice in mind, and not electoral or political concerns.

In an acetic acid solution:

1. To make a buffer with pH = 5.00, have a ratio of

\(\frac{[A-]}{[HA]} = 10^{-5.50}\) = 0.316.

The volume of sodium hydroxide needed:

V(NaOH) = (0.316 M - 0.200 M) / 4.50 M = 0.0316 L = 31.6 mL

Therefore, 31.6 mL of 4.50 M sodium hydroxide must be added to 250.0 mL of 0.200 M acetic acid solution to make a buffer with pH = 5.00.

2. The pH of the buffer is calculated as follows:

pH = pKa + log(\(\frac{[A-]}{[HA]}\))

= 4.76 + log(0.2/0.1)

= 4.86

Therefore, the pH of the buffer is 4.86.

3. The mass of salt that must be dissolved in 0.25 dm³ of 1 mol dm³ propanoic acid to give a buffer of pH 4.87:

\(\frac{[A-]}{[HA]} = 10^{-4.87}\) = 0.0114

Therefore, the mass of acetate that must be dissolved:

Mass of acetate = (0.0114 mol dm³)(0.25 dm³) = 0.00285 g

Therefore, 0.00285 g of sodium propanoate must be dissolved in 0.25 dm³ of 1 mol dm³ propanoic acid to give a buffer of pH 4.87.

4. The pH of the buffer is calculated as follows:

pH = pKa + log(\(\frac{[A-]}{[HA]}\))

= 4.74 + log(0.1/0.1)

= 4.74

Therefore, the pH of the buffer is 4.74.

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Answer:

To find the number of atoms in 1.525 moles of potassium, you can use the formula:

Number of atoms = Number of moles * Avogadro's number

Avogadro's number is a constant that is equal to 6.022 x 10^23 atoms/mole. Plugging in the values for the number of moles and Avogadro's number, you get:

Number of atoms = 1.525 moles * (6.022 x 10^23 atoms/mole)

= 9.149 x 10^23 atoms

Therefore, there are approximately 9.149 x 10^23 atoms of potassium in 1.525 moles of potassium.

According to Avogadro's number there are 9.18×10²³ atoms of potassium  which  make up 1.525 moles of potassium.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number

In the given question number of atoms =number of moles×Avogadro's number=1.525×6.023×10²³=9.18×10²³ atoms .

Thus ,there are 9.18×10²³ atoms of potassium  which  make up 1.525 moles of potassium.

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Answer:

4d orbital.

Explanation:

Hello!

In this case, since zirconium's atomic number is 40, we fill in the electron configuration up to 40 as shown below:

\(1s^2,2s^2,2p^6, 3s^2,3p^6,4s^2,3d^{10},4p^6,5s^2,4d^2\)

Thus, the orbital 4d is partially filled.

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The percentage left is 57%.

We know that a fraction is a part of a whole. Let us in this case take the whole as one and then the fraction that we remove out of it is 3/7. We now have to find the percentage that remains.

Thus'

Fraction that remains = 1 - 3/7 = 4/7

Hence;

Percentage that is left = 4/7 * 100

= 57%

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Answer:

Answer: 3.45 moles Li contains 2.08 × 10 (to the power of)24 atoms . Explanation: The relationship between atoms and moles is:. 1 mole atom. =6.022

Answer:

\(\boxed {\sf 5.63 \times 10^{24} \ atoms \ Li}}\)

Explanation:

We are asked to find how many atoms are in 9.35 moles of lithium (Li)

Moles are converted to atoms using Avogadro's Number or 6.022×10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are atoms of lithium.

We convert using dimensional analysis, so we set up a conversion factor using Avogadro's Number.

\(\frac {6.022 \times 10^{23} \ atoms \ Li}{1 \ mol \ Li}\)

We are converting 9.35 moles of lithium to atoms, so we multiply the conversion factor by this value.

\(9.35 \ mol \ Li *\frac {6.022 \times 10^{23} \ atoms \ Li}{1 \ mol \ Li}\)

The units of moles of lithium cancel.

\(9.35 *\frac {6.022 \times 10^{23} \ atoms \ Li}{1 }\)

\(9.35 *{6.022 \times 10^{23} \ atoms \ Li}\)

\(5.63057\times10^{24} \ atoms \ Li\)

The original value of moles (9.35) has 3 significant figures, so our answer must have the same. For the number we found that is the hundredth place. The 0 in the thousandth place tells us to leave the 3 in the hundredth place.

\(5.63 \times 10^[24} \ atoms \ Li\)

9.35 moles of lithium contains approximately 5.63×10²⁴ atoms of lithium.

Answer:

(a) Rate of formation of NO2 is also 0.066M/s

(b) Rate of reaction of O2 gas is 0.033M/s

Explanation:

(a) in one second, according to the equation,

2 moles of NO combines with 2moles of NO2.

Therefore 0.066M NO will still consume 0.066mole NO2.

(b) According to the equation,

2 moles NO consumes 1 mole O2, 0.0666M will consume 0.0333 mole O2