How many atoms of carbon are present in 1.0 g of CH5N?atoms C

Answer:

the water which are very healthy is known as hydrated water

The molality of the calcium nitrite solution is 1.68 mol/kg.

The molality of a solution is defined as the number of moles of solute dissolved per kilogram of solvent. To find the molality of the calcium nitrite solution, we need to first calculate the number of moles of calcium nitrite and then divide it by the mass of the solvent in kilograms.

The molar mass of calcium nitrite (Ca(NO2)2) is 132.09 g/mol.

So, the number of moles of calcium nitrite in 18.5 g is:

moles of Ca(NO2)2

=> 18.5 g / 132.09 g/mol

=> 0.140 mol

The mass of the solvent (distilled water) is 83.5 g, or 0.0835 kg.

Therefore, the molality of the solution is:

molality = 0.140 mol / 0.0835 kg

=> 1.68 mol/kg

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The animal bone is approximately 19,028 years old based on the 40% loss of carbon-14.

To determine the age of an animal bone based on the percentage of carbon-14 remaining, we can use the concept of half-life. The half-life of carbon-14 is approximately 5,750 years, which means that after this time, half of the carbon-14 originally present will have decayed.

If the bone has lost 40% of its carbon-14, it means that only 60% of the original carbon-14 remains. We can calculate the number of half-lives that have passed to reach this percentage.

Let's assume the original amount of carbon-14 in the bone was 100 units. After one half-life, 50 units of carbon-14 would remain (50% of the original amount). After two half-lives, 25 units would remain (50% of 50 units). Similarly, after three half-lives, 12.5 units would remain (50% of 25 units).

To find out how many half-lives it took to reach 60%, we can set up the following equation:

12.5 units (remaining amount) = 100 units (original amount) * (1/2) ^ n (number of half-lives)

Solving for n:

12.5 = 100 * (1/2) ^ n

Dividing both sides by 100:

0.125 = (1/2) ^ n

Taking the logarithm of both sides:

log(0.125) = log[(1/2) ^ n]

n * log(1/2) = log(0.125)

n = log(0.125) / log(1/2)

Using a calculator, we can find:

n ≈ 3.3219

Therefore, approximately 3.3219 half-lives have passed.

Since each half-life is approximately 5,750 years, we can calculate the age of the bone:

Age = Number of half-lives * Half-life duration

Age = 3.3219 * 5,750 years

Age ≈ 19,028 years

Thus, the animal bone is approximately 19,028 years old based on the 40% loss of carbon-14.

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Answer:

Glycerine, water and methylated spirits have hydrogen bonds between the molecules. However, in water and Glycerine these intermolecular forces are very strong while in the methylated spirits they are slightly weaker. This leads to the higher boiling point for water and Glycerine.

Explanation:

In chemistry a molecular formula indicates every single atom and its numbers in a chemical compound. Hence the molecular formula C3H8O3 simply says that there are three carbon (C) atoms, eight hydrogen (H) atoms and three oxygen (O) atoms in this compound.

Answer:

2.56g of H₂S

Explanation:

The reaction of H₂S with Pb(CH₃COO)₂ is:

H₂S + Pb(CH₃COO)₂ → 2 CH₃COOH + PbS

Where 1 mole of H₂S produce 1 mole of PbS

18.00g of PbS (Molar mass: 239.3g/mol):

18.00g of PbS ₓ (1mol / 239.3g) = 0.0752 moles of PbS

As 1 mole of PbS is produced from 1 mole of H₂S, moles needed of H₂S are 0.0752

As molar mass of H₂S is 34.1g/mol, mass in 0.0752moles is:

0.0752 mol H₂S ₓ (34.1g / mol) = 2.56g of H₂S

By investigating the origins of various diseases, scientists play a key role in hospitals. They aid in understanding the underlying processes, risk factors, and potential therapies for many illnesses through their scientific knowledge and research techniques.

To understand the intricacies of diseases , their study involves running tests, analysing data, and working with other medical specialists. By figuring out the underlying reasons, scientists make it possible to create efficient diagnostic equipment, therapeutic methods, and preventative techniques .

Their discoveries and techniques expand medical knowledge, improve patient care, and ultimately work towards communities and people experiencing greater health. There are very factors that contribute to the overall institution.

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Understanding the relationship between reactants and products in a reaction is crucial for understanding chemistry. That is what stoichiometry is.

It is a quantitative relationship between the mass (and thus the number of moles) of different products and reactants in a chemical reaction.

Chemical reactions must be balanced, or in other words, the products and reactants must both contain the same number of different atoms.

A chemical reaction cannot yield any knowledge about the relationship between its products and reactants if it is not balanced. In order to balance a chemical reaction, you should do so initially.

By placing coefficients in front of the reactants and products, we may balance processes. The stoichiometric coefficients are these values.

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change from solid to liquid

Explanation:

There are 6.022 x 10^23 carbon atoms in 1.00 mole of methane.

To find the number of carbon atoms in 1.00 mole of methane (CH4), you need to use Avogadro's number, which is 6.022 x 10^23 atoms/mole.

Step 1: Identify the number of moles of methane (CH4) given, which is 1.00 mole.

Step 2: Determine the number of carbon atoms in one molecule of methane. In CH4, there is 1 carbon atom.

Step 3: Multiply the number of moles of methane by Avogadro's number and the number of carbon atoms per molecule.
1.00 mole x 6.022 x 10^23 atoms/mole x 1 carbon atom/molecule = 6.022 x 10^23 carbon atoms

So, there are 6.022 x 10^23 carbon atoms in 1.00 mole of methane.

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Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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Answer:

1) 40

2) 2.25 moles

3) 17

4) 120

5) Fe₂O₃

Explanation:

Please see attached picture for full solution.

Answer:

1) \(\boxed{Molar \ mass = 40\ g/mol}\)

2) \(\boxed{No.\ of\ Moles = 1.61 \ moles}\)

3) \(\boxed{Ammonia = 16\ g/mol}\)

4) \(\boxed{Sodium\ Hydrogen\ Sulphate= 120 \ g/mol}\)

5) \(\boxed{Fe_{2}O_{3}}\)

Explanation:

Question # 1:

Using Formula, No. of moles = Mass in grams / molar mass

Where moles = 0.375 mol. , mass = 15 g

=> Molar Mass = Mass in grams / No. of moles

=> Molar Mass = 15 / 0.375

=> Molar mass = 40 g/mol

Question # 2:

No. of moles = Mass in grams / Molar mass

Where Mass = 90 g ,

=> Molar Mass = \(MgO_{2}\)

=> MM = 24 + (16*2)

=> MM = 24 + 32

=> MM = 56 g/mol

No. of Moles = 90 / 56

No. of Moles = 1.61 moles

Question # 3:

Ammonia => \(NH_{3}\)

N has atomic mass 14 ang H has atomic mass 1

Ammonia = (14)+(1*2)

Ammonia = 14+2

Ammonia = 16 g/mol

Question # 4:

Sodium Hydrogen Sulphate => \(NaHSO_{4}\)

Where Na has atomic mass 23, H has atomic mass 1 , sulpher 32 and oxygen 16

\(NaHSO_{4}\) = 23+1+32+(16*4)

=> 56+64

=> 120 g/mol

Question # 5:

The metal which has relative atomic mass of 56 is Iron (Fe)

Given that the oxide contains 70.0 % of Metal

Mass of \(MO_{x}\) (Metal oxide) = 56 / 70 * 100

Mass of \(MO_{x}\) (Metal oxide)  = 0.8 * 100

Mass of \(MO_{x}\) (Metal oxide)  = 80

Mass of x O's = 80 - 56

Mass of x O's = 24

Now, Mass of O = 24 / 16

Mass of O = 1.5

So, Fe Metal and its oxide are in the ratio of

1 : 1.5

×2   ×2

2 : 3

So, the empirical formula of metal with its oxide is \(Fe_{2}O_{3}\)

Answer:

Explanation:

Baby pigs, dolphins, bats and elephants all drink milk! Because the babies rely on their mother's milk to live, the mammal mommies have to care for their young. ... Through copying their mothers, baby mammals learn everything they need to survive

Answer:

by be young

Explanation:

wow just use you brain

To determine the molarity of the NiCl2 solution, we can use the stoichiometry of the balanced chemical equation and the concept of molar ratios.

The balanced chemical equation for the reaction between NiCl2 and NaOH is:

NiCl2 + 2NaOH -> Ni(OH)2 + 2NaCl

From the equation, we can see that 1 mole of NiCl2 reacts with 2 moles of NaOH.

Given that 10.0 mL of a 0.250 M NaOH solution is used, we can calculate the number of moles of NaOH:

moles of NaOH = volume (L) x molarity

moles of NaOH = 0.010 L x 0.250 M

moles of NaOH = 0.0025 mol

According to the stoichiometry of the balanced equation, 1 mole of NiCl2 reacts with 2 moles of NaOH. Therefore, the number of moles of NiCl2 is half of the moles of NaOH:

moles of NiCl2 = 0.0025 mol / 2

moles of NiCl2 = 0.00125 mol

Now, let's calculate the molarity of the NiCl2 solution:

Molarity (M) = moles of solute / volume of solution (L)

Molarity = 0.00125 mol / 0.030 L

Molarity = 0.0417 M

Therefore, the molarity of the NiCl2 solution is 0.0417 M.

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Answer:

1) Nodes

2) Speed

3) Bends

Answer: The proportions of components can vary.

Explanation:

A mixture is a combination that has to do with two or more substances. Some characteristics or properties of mixtures are that the substances that are added together retain their properties.

Also, the proportion of the components can vary and the components can be separated.

Therefore, the answer to the question will be option 3 "The proportions of components can vary".

Answer:

20

Explanation:

Answer:

C: Energy is either released or absorbed

Explanation:

I took the test

When using a ventilated air space to reduce the required clearance between an appliance and unprotected combustible materials, the minimum air space that is typically required is 1 inch (25.4 mm). This allows for proper ventilation and helps to prevent the risk of combustion or fire hazards.

When using ventilated air space to reduce the required clearance between an appliance and unprotected combustible materials, the minimum air space typically required is 1 inch. This allows for adequate ventilation to prevent the buildup of heat and potential combustion of the surrounding materials. It is important to follow manufacturer's instructions and local building codes when determining the required clearance and air space for specific appliances.

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Answer:

1M

Explanation:

The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.

Hope this helps!

Answer:

In a periodic table the average atomic mass of magnesium is given as 24.312 u.

Start superscript, plus, and finish superscript moments can occur in the concentration gradient that the sodium creates. The atomic number of sodium is 11 and its symbol is Na.

Which comes from the Latin word natrium. It is a highly reactive, silvery-white, pliable metal. Sodium is an alkali metal in group 1 of the periodic chart. Its only stable isotope is Na. The free metal cannot be found in nature, so it must be prepared from compounds. The sixth most common element in the Earth's crust, sodium, is found in many minerals, including feldspars, sodalite, and halite (NaCl). Uses, Chemical Composition, and Physical Properties of Sodium Sodium is an atomic number 11 chemical element with the symbol Na.

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160 grams of I-131 were in the original sample if the half-life is 8 days.

In a chemical reaction, the time taken for the concentration of that substance to become half of its initial value is called half-life. This term is used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay .

The amount left N after n half lives of a radioactive element with original amount N₀ is given as:

N= N₀ (1/2)ⁿ

Given, half life of Iodine-131 is 8 days

n= 40/8= 5

5= N₀ (1/2)⁵

N= 32 * 5

= 160 grams

Hence, the original amount amount of  I-131 will be 160 grams.

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The electronic configuration for the \(S^{-2}\) ion is [Ne] 3s2 3p6.

\(S^{-2}\) ions are negatively charged ions that are composed of two sulfur atoms. They are produced when sulfur atoms gain two electrons, creating a net negative charge. These ions are highly reactive and can form strong bonds with other atoms, molecules, and ions. This is because when an atom loses two electrons, the outermost shell (3p) must gain two electrons to fill the quantum level. its electron configuration changes to the next noble gas (in this case, Neon) plus two additional electrons. Since 3p has six electrons, the electronic abbreviation for the \(S^{-2}\) ion is [Ne] 3s2 3p6.

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Answer: B. Na

Explanation:

The element with 11 protons is sodium (Na), which has an atomic number of 11, indicating the number of protons in the nucleus of an atom of sodium. The atomic number uniquely identifies each element, so any element with 11 protons in its nucleus is sodium.

In addition, the atom in question has 11 electrons, which are equal in number to the protons, as atoms are electrically neutral. Furthermore, the atom has 12 neutrons, which is the total number of nucleons (protons and neutrons) in the nucleus. The atomic mass of sodium is approximately 23, which means that the most common isotope of sodium has 12 neutrons. Therefore, the atom in question has one more neutron than the most common isotope of sodium.

In summary, the atom described has 11 protons, 11 electrons, and 12 neutrons, which are the characteristics of a sodium atom with an atomic mass of approximately 23.

A special gas mixture used in bacterial growth chambers contains 1.00y mass co2 and 99.0y mass o2. if the partial pressure of oxygen is 0.970 atm, the total pressure in the bacterial growth chambers would be 0.972 atm.

Solve this problem, we can use the formula for partial pressure:
Partial Pressure = Mole Fraction x Total Pressure
We know the mass fractions of CO2 and O2 in the gas mixture, but we need to find their mole fractions.

We can do this by dividing each mass fraction by the molar mass of the respective gas and then adding the two mole fractions together:
Mole Fraction of CO2 = (1.00y / 44.01 g/mol) / [(1.00y / 44.01 g/mol) + (99.0y / 32.00 g/mol)] = 0.00216y
Mole Fraction of O2 = (99.0y / 32.00 g/mol) / [(1.00y / 44.01 g/mol) + (99.0y / 32.00 g/mol)] = 0.99784y
Now we can use the given partial pressure of oxygen and the mole fraction of oxygen to find the total pressure:
0.970 atm = 0.99784y x Total Pressure
Total Pressure = 0.970 atm / 0.99784y
Total Pressure = 0.972 atm
Therefore, the total pressure in the bacterial growth chambers would be 0.972 atm.

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fringing reef..........

Answer:

The answer is 1:1

Explanation:

The equivalent energy (Eb) of the mass defect of an atom of 18 8o is 1.12 x 10^-11 Joules.

The equivalent energy (Eb) of the mass defect of an atom can be calculated using Einstein's famous equation E=mc². To find the mass defect of an atom of 18 8o, we need to subtract the mass of its individual protons, neutrons, and electrons from the mass of the atom.

The mass of 18 8o can be found in the periodic table, which is 17.99916 atomic mass units (amu). The total number of protons and neutrons in an atom of 18 8o is 18 (since oxygen has 8 protons and 10 neutrons).

The mass of 18 individual protons and 10 individual neutrons can also be found in the periodic table, which is 18.01528 amu and 15.01801 amu, respectively. The mass of 8 electrons is negligible compared to the mass of the protons and neutrons.

Therefore, the mass defect of an atom of 18 8o can be calculated as:

mass defect = (18 x 1.00728 amu) + (10 x 1.00867 amu) - 17.99916 amu
mass defect = 0.1255 amu

Now, to calculate the equivalent energy (Eb) of the mass defect, we simply plug the mass defect value into Einstein's equation:

Eb = (0.1255 amu) x (1.66054 x 10^-27 kg/amu) x (299,792,458 m/s)^2
Eb = 1.12 x 10^-11 J

Therefore, the equivalent energy (Eb) of the mass defect of an atom of 18 8o is 1.12 x 10^-11 Joules.

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