If on average you inhale once every three seconds exactly, how many times do you inhale in a 24-hour day?

Answer:

There arr 1.5*1024 molecules in 2.40 moles of H2O.

The number of moles of acetylsalicylic acid in each tablet is 1.8 × 10⁻³ mol.Moles of acetylsalicylic acid in each tablet

The number of moles of acetylsalicylic acid in each tablet can be calculated by using the formula mentioned below:

Number of moles = Given mass of substance / Molar mass

Given data:

Mass of acetylsalicylic acid in each tablet = 325 mg

Molar mass of acetylsalicylic acid = 180.15 g/mol (calculated from C9H8O4)

Conversion of mass from milligrams to grams will give the result in mols of acetylsalicylic acid present in each tablet:

Number of moles of acetylsalicylic acid in each tablet = (325 mg)/(1000 mg/g) / 180.15 g/mol

= 1.8×10⁻³ mol (rounded to 3 significant figures)

Hence, the number of moles of acetylsalicylic acid in each tablet is 1.8 × 10⁻³ mol.

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Answer: 0.071 moles of excess reactant \((O_2)\) will be left over.

Explanation:

To calculate the moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}\)

a) moles of \(NO\)

\(\text{Number of moles}=\frac{21.6g}{30.01g/mol}=0.720moles\)

b) moles of \(O_2\)

\(\text{Number of moles}=\frac{13.8g}{32g/mol}=0.431moles\)

\(2NO(g)+O_2(g)\rightarrow 2NO_2(g)\)

According to stoichiometry :

2 moles of \(NO\) require 1 mole of \(O_2\)

Thus 0.720 moles of  \(NO\) require=\(\frac{1}{2}\times 0.720=0.360moles\) of \(O_2\)

Thus \(NO\) is the limiting reagent as it limits the formation of product and \(O_2\) is the excess regaent.

moles of \(O_2\) left = (0.431-0.360) = 0.071 moles

Answer:

Nuclear Charge

Explanation:

As we move from sodium to chlorine across, there's increase in atomic number (protons). This also means there is increase in the valence electrons (The valence electrons is denoted by the group).

As the number of protons increases, the nuclear energy also increases. Due to this, the electrons are attracted more strongly and pulled closely to the nucleus.

The frequency of yellow light, which has a wavelength of 5.56 x 10^-7 m is  5.40 x 10^14 Hz. Therefore, option B is correct.

The distance between identical points (adjacent crests) in adjacent cycles of a waveform signal propagated in space or along a wire is defined as the wavelength. This length is typically specified in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).

The wavelength is the distance between two wave crests, and it is also the distance between two wave troughs. The frequency is measured in cycles per second (Hz) and is the number of vibrations that pass over a given spot in one second (Hertz).

Speed is distance over time, Therefore, v = λ / T.

The frequency, f, is 1/T, so the equation relating wave speed, frequency, and wavelength is v = c / λ .

Given :

Wavelength = 5.56 x 10^-7 m

Frequency = ?

Speed (c) = 3 × 10⁸m/s

v = c / λ

By substituting given values in equation and we get,

v =  3 × 10⁸ / 5.56 x 10^-7

= 5.40 x 10^14

The frequency of yellow light is 5.40 x 10^14.

Thus, option B is correct.

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The production of aluminum by the electrolytic reduction of alumina involves the oxidation of graphite at the anode, which produces carbon dioxide (CO2) gas. In order to calculate the mass of graphite that must be consumed to produce 1000 kg of aluminum, we need to use the stoichiometry of the reaction.

The balanced chemical equation for the reaction is:

2 Al2O3 + 3 C → 4 Al + 3 CO2

This equation tells us that for every 3 moles of graphite (C) consumed, we can produce 4 moles of aluminum (Al). We can use this information to calculate the amount of graphite required to produce a given amount of aluminum.To start, we need to determine the number of moles of aluminum in 1000 kg of the metal. The molar mass of aluminum is 26.98 g/mol, so:

1000 kg Al × (1000 g/kg) ÷ (26.98 g/mol) = 37,051.5 mol A

Next, we can use the stoichiometry of the reaction to determine the number of moles of graphite required to produce this amount of aluminum. For every 4 moles of Al produced, we need 3 moles of C:

37,051.5 mol Al × (3 mol C/4 mol Al) = 27,788.6 mol C

Finally, we can convert the number of moles of graphite to mass, using the molar mass of carbon (12.01 g/mol):

27,788.6 mol C × 12.01 g/mol = 333,391 g or 333.4 kg

Therefore, approximately 333.4 kg of graphite must be consumed in order to produce 1000 kg of aluminum by the electrolytic reduction of alumina.

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The density of a solution is the mass of the solution divided by the volume of the solution. To find the density of the solution in this question, we need to find the mass of the solution and the volume of the solution.

The mass of the solution can be found by subtracting the mass of the graduated cylinder from the mass of the graduated cylinder containing the solution.
Mass of solution = Mass of graduated cylinder containing solution - Mass of graduated cylinder
Mass of solution = 34.200 g - 28.102 g
Mass of solution = 6.098 g

The volume of the solution is given in the question as 6.25 mL.
Now we can find the density of the solution by dividing the mass of the solution by the volume of the solution.
Density of solution = Mass of solution / Volume of solution
Density of solution = 6.098 g / 6.25 mL
Density of solution = 0.976 g/mL

So the density of the solution is 0.976 g/mL.

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Cl2 = 70.9 g/mol

=

\(21.4 \: mol \times \frac{70.9 \: g}{1 \: mol} = 1517.26 \: g\)

Answer:

Wavelength (D)............

Answer:

A

Explanation:

the amplitude is measured from the dotted line to the top of the crest. Looking at the picture the amplitude gets smaller

The half life of the sample is 14 hours and the time taken is 97 hours.

We know that radioactivity has to do with the fact that there is element decomposed within a given time frame. Let us note that the half life has to do with the time taken for only half of the radioactive material to remain.

We can see that the time that is taken for only half of the sample to remains is about 14 hours.

We now know that;

N/No = (1/2)^t/\(t_{\frac{1}{2} }\)

N = Number of atoms

No = Initial number of atoms

t = time taken

\(t_{\frac{1}{2} }\) = The half life

Then we have;

2.5/320 = (1/2)^ t/14

7.8 * 10^ -3 = (0.5)^t/14

ln(7.8 * 10^ -3 ) = t/14 ln(0.5)

t = ln(7.8 * 10^ -3 ) / ln(0.5) * 14

t = -4.8/-0.693 * 14

t = 97 hours

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The direct function of the energy released from the nuclear chain reaction in a nuclear power plant is for heating water to produce steam.

A chain reaction is type of reaction in which neutrons released in fission produce an additional fission in at least one further nucleus.

This type of reaction involves the release of energy. This energy or heat is used to make steam that spins a turbine to create electricity.

Thus, we can conclude that, the direct function of the energy released from the nuclear chain reaction in a nuclear power plant is for heating water to produce steam.

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Answer:

what wrong

Explanation:

Answer:

That is a nice picture i love it plus if you need help just ask we can help :3

Explanation:

Answer: 112.2 g

Explanation:

The atomic mass of silicon is 32.065 g/mol, so 3.5 moles have a mass of (3.5)(32.065) grams, or about 112.2 g

Answer:

B. Fuel cell cars reduce use of non-renewable fossil fuels

Explanation:

Answer:

yo what

Explanation:

Answer:

62.58200 centimeters

Explanation:

Hope this helps!

The moles of KMnO₄ needed to form 0.886 moles of carbon dioxide is 2.42 moles.

Balanced chemical reaction

14KMnO₄ + 4C₃H₅(OH)₃ → 7K₂CO₃ + 7Mn₂O₃ + 5CO₂ + 16H₂O.

Given the question:

n(CO₂) = 0.886 mol

From the chemical reaction:  n(CO₂) : n(KMnO₄) = 5 : 14

n(KMnO₄) = [n(CO₂) x 14] ÷ 5

n(KMnO₄) = [0.866 mol x 14] ÷ 5

n(KMnO₄) = 12.124 ÷ 5

n(KMnO₄) =2.42 mol

So, moles of KMnO₄ are consumed to form 0.886 moles of carbon dioxide is 2.42 mol.

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Answer:

Answer:

Option D

Explanation:

it has the same types of atoms on both sides of the reaction

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D) It has the same types of atoms on both sides of the reaction arrow.

Explanation:

This law was made by the Antoine Lavoisier in 1789. He want to confirm that the mass of reactant is equal to the mass of product and he was successful to carry out the test.

Answer:

0.00714 g

Explanation:

We know that the volume of one mole of a substance is 22400 cm^3

Thus;

1 mole of sulphur occupies 22400 cm^3

x moles of sulphur occupies 5.0 cm3

x = 5.0 cm3 * 1 mole/22400 cm^3

x = 2.23 * 10^-4 moles

Molar mass of sulphur = 32 g/mol

Mass of sulphur = 2.23 * 10^-4 moles * 32 g/mol

Mass of sulphur = 0.00714 g

Answer:

blurred an pic mo paki ayos

The activation energy of a molecule or compound is the minimum amount of energy that must be added to  to a system to break the bonds of the reactants. Hence, option C is correct.

Reactants are reacting species in a chemical reaction, that gives new products by regrouping atom in reactants. The valence electrons of reactants are participated in a chemical reaction.

Reactants needs some energy to activate themselves lead to effective collision between reactants to result in products. This additional energy required by reactants is called the activation energy.

This energy is needed weaken the intermolecular attraction and electrostatic forces within the atoms of reactants and enabling them to be reactive.

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The mass concentration of CaCl2 in the solution is 4.00 g/mL.

To calculate the mass concentration of CaCl2 in the solution, use the following formula:

Mass Concentration = (Mass of solute) / (Volume of solution)

Given that the mass of CaCl2 is 10.0 g and the mass of the solution is 250.0 g, the mass concentration can be calculated as:

Mass Concentration = 10.0 g / 250.0 g = 0.04 g/g

The result can also be expressed as 4.00 g/mL since the units of mass concentration can be grams of solute per milliliter of solution.

Therefore, the mass concentration of CaCl2 in the solution is 4.00 g/mL.

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Answer:

Chemistry Boyle’s and Charles’s Laws Practice Problems

Boyle’s Law - volume and pressure changes at constant temperature

1. Bacteria produce methane gas in sewage-treatment plants. This gas is often captured or burned. If a bacterial culture produces 60.0 mL of methane gas at 700.0 mm Hg, what volume would be produced at 760.0 mm Hg?

2. A gas has a pressure of 1.26 atm and occupies a volume of 7.40 L. If the gas is compressed to a volume of 2.93 L, what will its pressure?

3. Hospitals buy 400-L cylinders of oxygen gas compressed at 150 atm. They administer oxygen to patients at 3.0 atm in a hyperbaric oxygen chamber. What volume of oxygen can a cylinder supply at this pressure?

Charles’s Law - volume and temperature changes at constant pressure

4. A balloon is filled with 3.0 L of helium at 310 K. The balloon is placed in an oven where the

temperature reaches 340 K. What is the new volume of the balloon?

5. A gas at 65 oC occupies 4.22 L. At what Celsius temperature will the volume be 3.87 L?

6. A 4.0 L sample of methane gas is collected at 30.0 oC. Predict the volume of the sample at 0 oC.

Mixed Review

7. The volume of a scuba tank is 10.0 L. It contains a mixture of nitrogen and oxygen at 290. atm. What volume of this mixture could the tank supply to a diver at 2.40 atm?

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8. A helium-filled balloon has a volume of 2.75 L at 20. C. The volume of the balloon decreases

to 2.46 L after it is placed outside on a cold day. What is the outside temperature in oC?

9. A 25 L sample of nitrogen is heated from 110 oC to 260 oC. What volume will the sample occupy at the higher temperature?

10. A 1.00 L balloon is filled with helium at 1.20 atm. If the balloon is squeezed into a 0.500 L beaker and doesn’t burst, what is the pressure of the helium?

Boyle’s and Charles’s Laws Practice Problems Answer Key 1. 55.3 mL

2. 3.18 atm

3. 20 000 L

4. 3.3 L

5. 37oC

6. 3.6 L

7. 1210 L

8. -11oC

9. 35 L

10. 2.40 atm

Explanation:

Answer:

It appears to be

Explanation:

I did that question.

Answer:

kilogram (kg)

Explanation:

Answer:

I believe the answer is A: shaken

Explanation:

The solute will dissolve quicker if the solute is more shaken.

A solute is a substance that can be dissolved by a solvent to create a solution. A solute can come in many forms. It can be gas, liquid, or solid.

The solvent, or substance that dissolves the solute, breaks the solute apart and distributes the solute molecules equally. This creates a homogenous mixture, or solution that is equal throughout.

Solutes in solution are measured by their concentration. The concentration of a solute is the amount of solute divided by the total volume of solution.

A solvent can dilute various amounts of solute, depending on how strong of a solvent is used and how easily the solute molecules come apart. This property of solutes to dissolve in a solvent is known as solubility.

Therefore, The solute will dissolve quicker if the solute is more shaken.

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Answer:

3.96×10^−22J

Explanation:

First find the frequency of the photon from the equation

c=fλ

∴f=c/λ

=3×10⁸m/s / 0.050×10^−2m

=6×10¹¹Hz.

Energy of such photons is quantized and given by

E=hf

=(6.6×10^−34)(6×10¹¹)

=3.96×10^−22J

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of photon is 3.96×10⁻²²J.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave

There is a relation between energy of wave. frequency of wave, and wavelength of wave

Mathematically,

E=hc/λ

where,

E = energy of electromagnetic wave

h is planks constant having value 6.67×10⁻³⁴js

c is speed of light that is 3×10⁸m/s

λ is the wavelength of electromagnetic wave

frequency=speed of light/wavelength

                =3×10⁸m/s / 0.050×10⁻²m

                 =6×10¹¹Hz.

E=h×frequency

  =(6.6×10⁻³⁴)(6×10¹¹)

  =3.96×10⁻²²J

Therefore, the energy of photon is 3.96×10⁻²²J.

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