Define molecular mass. Calculate the molecular mass of calcium carbonate
and nitric acid.

Answer:

One difference between Group 7 of the modern periodic table and Group 7 in Mendeleev's periodic table is the placement of the elements.

In Mendeleev's periodic table, Group 7 consisted of manganese (Mn), technetium (Tc), and rhenium (Re). In the modern periodic table, Group 7 consists of the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

The halogens are a group of highly reactive nonmetals, while the elements in Group 7 of Mendeleev's periodic table were not all nonmetals and did not share the same chemical properties as the halogens.

Hope this helps!

(C:) 84.0 g H2 O

Its the right answer

The mass of the water in the original container by assuming that all heat lost by the copper is gained by the water is 116.23 g.

Mass is the term that told the quantity of a matter.

Given the mass of copper = 110g

The specific heat capacity of copper is 0.20 j/C g

The initial temperature of  copper is 82.4 C

The final temperature of copper and water is 24.9 C

Now, we would determine the mass of the water.

From the formula for sensible heat, ΔH = m × c × ΔT

Where, H = sensed heat,

m = mass,

ΔT = temperature change

Putting the above values in the equation.

ΔH = m × c × ΔT

110 × 0.20 × ( 82.4 - 24.9 ) = mw × 4.186 × (24.9 - 22.3)

1265 J = mw × 10.8836 or mw = 116.23 g

Thus,  the mass of water is 116.23 g.

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The mass of 7.8 x 10^22 carbon atoms is 1.553 grams.

To determine the mass of 7.8 x 10^22 carbon atoms, we need to use the concept of molar mass and Avogadro's number.

The molar mass of carbon (C) is approximately 12.01 g/mol, which represents the mass of one mole of carbon atoms. Avogadro's number states that there are 6.022 x 10^23 atoms in one mole of any substance.

Now, let's calculate the mass of 7.8 x 10^22 carbon atoms:

Determine the number of moles:

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

Number of moles = (7.8 x 10^22) / (6.022 x 10^23) = 0.1295 moles

Calculate the mass:

Mass = Number of moles x Molar mass

Mass = 0.1295 moles x 12.01 g/mol = 1.553 g

Therefore, the mass of 7.8 x 10^22 carbon atoms is approximately 1.553 grams.

The calculation is based on the understanding that the molar mass of carbon represents the mass of one mole of carbon atoms. By dividing the given number of atoms by Avogadro's number, we obtain the number of moles. Multiplying the number of moles by the molar mass gives us the mass in grams.

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Answer:

The principal quantum number (n) describes the size of the orbital. Orbitals for which n = 2 are larger than those for which n = 1, for example.

There are approximately \(2.76 * 10^{24\) ammonia molecules in the given sample.

To calculate the number of ammonia molecules in the sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia \((NH_3)\) can be calculated by adding up the atomic masses of nitrogen (N) and hydrogen (H):

Molar mass of \(NH_3\) = (1 x atomic mass of N) + (3 x atomic mass of H)

              = (1 x 14.01 g/mol) + (3 x 1.01 g/mol)

              = 14.01 g/mol + 3.03 g/mol

              = 17.04 g/mol

Now, we can calculate the number of moles of ammonia in the sample using the formula:

Number of moles = Mass of the sample / Molar mass

Number of moles = 78.25 g / 17.04 g/mol

              ≈ 4.5865 mol (rounded to four decimal places)

Finally, we can use Avogadro's number, which represents the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately \(6.022 * 10^{23\) particles/mol.

Number of ammonia molecules = Number of moles x Avogadro's number

Number of ammonia molecules ≈ 4.5865 mol x (\(6.022 * 10^{23\) molecules/mol)

                           ≈ \(2.76 * 10^{24\) molecules (rounded to two significant figures)

Therefore, the provided sample contains roughly \(2.76 * 10^{24\) ammonia molecules.

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The number of ammonia molecules in the sample is approximately 2.764 x \(10^{24}\) molecules.

To calculate the number of ammonia molecules in a given sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia (NH3) is calculated as follows:

Molar mass of N = 14.01 g/mol

Molar mass of H = 1.01 g/mol

Total molar mass of NH3 = 14.01 g/mol + (3 * 1.01 g/mol) = 17.03 g/mol

Now, we can calculate the number of moles of ammonia in the sample:

Number of moles = Mass of sample / Molar mass of NH3

Number of moles = 78.25 g / 17.03 g/mol = 4.594 moles

Next, we use Avogadro's number, which states that there are 6.022 x \(10^{23}\) molecules in one mole of a substance.

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

Number of molecules = 4.594 moles * 6.022 x \(10^{23}\) molecules/mol = 2.764 x \(10^{24}\) molecules

Therefore, there are approximately 2.764 x \(10^{24}\) ammonia molecules in the given sample of 78.25 g.

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Answer:

The correct answer is - A. 12.5 gram.

Explanation:

Given:

The initial amount of sample = 400 gram

the half-life cycle = 3 days

after 15 days remain value = ?

Solution:

The number of half-lives in 15 days = 15/3

= 5 half-lives

the remaining amount of sample after one half-life 3 days = 400/2 = 200

the remaining amount of sample after 2nd half-life or 6 days= 200/2 = 100

the remaining amount of sample after 3rd half-life or 9 days= 100/2 = 50

the remaining amount of sample after 4th half-life or 12 days= 50/2 = 25

the remaining amount of sample after 5th half-life or 15 days= 25/2 = 12.5 gram

Thus, the correct answer is = 12.5 g.

Answer:

only molecules with polar bonds may have a permanent dipole moment.

Explanation:

Answer:

34.3 g

Explanation:

Step 1: Write the balanced equation

2 CH₃CH₂OH ⇒ CH₃CH₂OCH₂CH₃ + H₂O

Step 2: Calculate the moles corresponding to 50.0 g of CH₃CH₂OH

The molar mass of CH₃CH₂OH is 46.07 g/mol.

50.0 g × 1 mol/46.07 g = 1.09 mol

Step 3: Calculate the theoretical moles of CH₃CH₂OCH₂CH₃ produced

The molar ratio of CH₃CH₂OH to CH₃CH₂OCH₂CH₃ is 2:1. The moles of CH₃CH₂OCH₂CH₃ theoretically produced are 1/2 × 1.09 mol = 0.545 mol.

Step 4: Calculate the real moles of CH₃CH₂OCH₂CH₃ produced

The percent yield of the reaction is 85%.

0.545 mol × 85% = 0.463 mol

Step 5: Calculate the mass corresponding to 0.463 moles of CH₃CH₂OCH₂CH₃

The molar mass of CH₃CH₂OCH₂CH₃ is 74.12 g/mol.

0.463 mol × 74.12 g/mol = 34.3 g

The amount of heat required to convert 94 g of ice at -31◦C to steam at 143.6◦C is 2.32 kJ.

Amount is a monetary measurement of value. It is a numerical value assigned to goods, services, and other transactions that indicate their worth in a currency. Amounts are used to quantify the size of a purchase or sale, and to determine the cost or value of an item. Amounts are also used to track debts, credits, investments, and other financial transactions.

This can be calculated using the formula for heat, Q = mCΔT, where m is the mass of the object, C is the specific heat capacity, and ΔT is the change in temperature. In this case, m is 94 g, C is 4.184 J/g · ◦C for water, and ΔT = 174.6◦C. Therefore, Q = 94 × 4.184 × 174.6 = 2.32 kJ.

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Answer:

If the molar mass of one unit of a substance is 67.2g/mol, then the mass of 8 units will be 67.2 x 8 , which gives a figure of 537.6g/mol

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 537.6g is the mass of 8.0 mol of the substance.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole of given substance=given mass of given substance ÷ molar mass of given substance

Mass of given substance = Mole of given substance× Molar mass of given substance

Molar mass of given substance=  67.2 g/mol

mole of given substance=8.0 mol

Substituting the values in above formula, we get

Mass = 8.0 mol × 67.2 g/mol

Mass of given substance=537.6g

Therefore, 537.6g is the mass of 8.0 mol of the substance.

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Answer:

Molecules from food and molecules of oxygen move from the mouth and the nose to cells of the body through a series of blood vessels, including veins, arteries, and microscopically small blood vessels (capillaries), that extend throughout the body.

Explanation: This is right

Diamond yields the largest mass of carbon monoxide.

The term combustion has to do with the burning of a substance in oxygen. Now we know that when we burn a substance in oxygen, the substance is oxidized.

The burning of a hydrocarbon in air gives carbon dioxide and water. We could sometimes obtain a low concentration of carbon monoxide when the combustion is carried out in a poor supply of air.

However, when we burn diamond in air which largely consists of carbon, we can see that the product of the reaction is carbon monoxide.

Thus diamond yields the largest mass of carbon monoxide.

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Answer:

the boiling point of solution at 3 decimal point is 100.329०C Ans.

Explanation:

given data -

molality of Nacl = 0.321 m

molal boiling point elevation constant (Kb) =0.512०C/m

# formula of change of boiling point of sample =

∆ Tb =i × Kb × m

Kb = molal boiling point of elevation constant

m = molality

i = vont's hoff factor.

Nacl is strong electrolyte and its 100% dissociate so the value of i for Nacl is 2

put value in the formula

∆ Tb = 2 × 0.512 ०C/m × 0.321m

= 0.3287

= 0.329०C

∆Tb = T'b - Tb

T'b = boiling point of solution

Tb= boiling point of solvent( water)

0.329०C = T'b - 100०c ( boiling point of water = 100०C)

T'b = 0.329०C + 100०C

= 100.329०C

hope this helps

Answer:

1s

not allowed

3d

not allowed

not allowed

4d

5f

Explanation:

Coefficient = n

l = n-1, where 0=s, 1=p, 2=d, 3=f

ml = -l to +l

The quantum numbers are used to show the arrangement of electrons in orbitals in an atom.

There are four sets of quantum numbers;

Now we are going to assign orbitals to each arrangement of quantum numbers as shown below;

n        l         ml          orbital

1         0        0            1s

3        -3        2           not allowed

3        2        -2           3d

2        0        -1           not allowed

0        0        0           not allowed

4        2         1           4d

5        3         0          5f

We can see that s p d f corresponds to l = 0 1 2 3.

Also note that;

When l = 0 then m= 0

When l= 1, m = -1, 0, 1

When l= 2  m = -2, -1, 0, 1, 2

When l =3  m = -3, -2, -1, 0, 1, 2, 3

Note that n must take positive integer values greater than zero.

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Solid potassium (K) conducts an electric current, whereas solid potassium iodide (KI) does not because solid potassium has a delocalized sea of electrons and KI has its cations and anions.

Positively charged potassium and negatively charged iodine combine to form the straightforward inorganic ionic chemical potassium iodide. It is solid at room temperature and resembles sodium chloride or table salt in terms of crystalline structure.

The major uses of potassium iodide are to treat hyperthyroidism and as a dietary supplement for those who are iodine deficient. Additionally, it is utilized as an expectorant to treat asthma and other long-term respiratory disorders, as well as to shield the thyroid gland from radiation.

When potassium iodide is dissolved in water, it splits into cations and anions, enabling free electron movement across the solution. It does not conduct electricity when it is in a dry crystal state, though, like other ionic compounds.

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Answer:

Use the Rydberg Equation 1/λ = R(1/n²(final) - 1/n²(initial) where R = 109,678 cm⁻¹. Substitute initial orbital number and final orbital number and solve for wavelength (λ).

Explanation:

Example:

Assume an electron transition from n = 5 to n = 2.

1/λ = 109,678cm⁻¹(1/2² - 1/5²) = 109,678(0.25 - 0.04)cm⁻¹ = 23,032cm⁻¹

λ = 1/23,032cm⁻¹ = 4.34 x 10⁻⁵cm x 10⁻²m/cm x 10⁹nm/m = 434nm

Answer:

Depending on the actual amount of water, it's going to overfill.

Explanation:

If your watershed is already one that has a lot of water and is always filled, it's likely that your wetlands and rivers will start to overfill, causing a form of flooding.

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I hope this helps!

-No one

Answer:

Solubility cannot be calculated.

Explanation:

To calculate the solubility of X it is necessary to know the value of the mass of the solute (X) that can be dissolved in 100 g of water.

\(Solubility = \frac{Solute mass}{100 grams of water}\)

Taking into account that we do not know the value of the mass of the solution, therefore the value of the solubility of the compound cannot be determined.

The pH of a 0.053 M solution of ammonium bromide at 25° C is equal to 33.9.

Acids are a substance that has a pH lower than 7 and bases are a substance that has a pH of more than 7.

the pH of any solution will be calculated as:

pH = -log[H⁺]

Given the chemical reaction in equilibrium with ICE table will be:

                         NH₄⁺  +  H₂O  ⇌  NH₃  +  H₃O⁺

Initial:                 0.289                       0          0

Change:                 -x                         +x        +x            

Equilibrium:      0.289-x                      x           x

Equation for Kb for this reaction is:

Kb = [NH₃][H₃O⁺] / [NH₄⁺]

Given value of Kb = 1.8 × 10⁻⁵

On putting values equation becomes

1.8 × 10⁻⁵ = x² / 0.053 - x

The value of x is negligible as compared to 0.053 so the equation becomes

1.8 × 10⁻⁵ = x² / 0.053

x = 2.28 × 10⁻³

i.e. [NH₃] = [H₃O⁺] =  33.9 × 10⁻³

Calculating the pH by putting this concentration value on the equation

pH = -log(33.9 × 10⁻³)

pH = 33.9

Thus, the pH will be 33.9.

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The following options describe situations in which hydrogen bonding will be observed between the solute and solvent is Solvent contains OH or NH groups, solute contains N, O, or F atoms. The Solvent and solute both contain OH or NH groups in the process.

It contains the maximum amount of solute that will dissolve in that solvent at that temperature.

Solution= solute+ solvent

The solubility of a solute depends on temperature. A solution containing just the right (maximum) amount of solute that can normally dissolve at a given temperature is said to be saturated. Solvent contains N, O, or F; solute contains OH or NH groups in general.

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The two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.

A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be broken or new ones created during this process.

sample 1 = mass of lead / mass of oxygen = 12.92g/2g = 6.46 .

sample 2 = mass of lead/ mass of oxygen = 34.27 - 14.39/14.39 = 1.38 .

so, the ratios are not the same.

Hence, the two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.

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Answer:

Test it with a blue light that is 45 cm away.

Explanation:

As

\(\\ \bull\sf\dashrightarrow \Delta H=+ve\)

\(\\ \bull\sf\dashrightarrow HE_1=HE_2\)

Let required absorption energy is x

\(\\ \bull\sf\dashrightarrow (432+799+x=413+745+358+467)\)

\(\\ \bull\sf\dashrightarrow 1231+x=1983\)

But

\(\\ \bull\sf\dashrightarrow x-1231=0\)

Hence

\(\\ \bull\sf\dashrightarrow x=1231KJ/mol\)

Option C is correct

Answer:

1 Absorbed

2 O=O

3 2,030 kJ

4 Yes, it would occur without additional energy because the reaction is exothermic.

5 The reaction is endothermic, because stronger bonds are broken than formed.

Answer:

Fluorine has a higher electronegativity than carbon

Explanation:

Electronegativity trend

-As you go from left to right across the periodic table, the electronegativity increases.

-As you go from top to bottom, the electronegativity decreases.

-We know that both carbon and fluorine are in the same energy level or period 2. However, Carbon is in group 14, which has 4 valence electrons, while fluorine is in group 17, which has 7 valence electrons. Therefore, fluorine has a higher electronegativity because fluorine is desperately wanted to gain 1 more valence electron to become stable (octet rule).

Answer:

a parallel circuit has two or more paths for current to flow through voltage is the same across each component of the parallel circuit the sum of the current through each path is equal to the total current that follows from the source another definition is in a parallel circuit all components are connected across each other formally exactly two sets of electricity common points a branch in a parallel circuit in a path of electricity current formed by one of the load component

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

I think the third one

Explanation:

i think

Answer:

electrons that are NOT shared equally

Explanation:

Answer:

Zn + 2HCl -> H2 + ZnCl2

CS2 + 2O2 -> CO2 + S2O2

Explanation: