Given the balanced equation CH4(g) + 202(g) → CO2(g) + 2H₂O(g),
1. How many moles of carbon dioxide (CO₂) are formed when 40 moles
of oxygen (O₂) is consumed?

Answer:

Limiting Reagent: NaHCO₃

Amount of NaCl: 69.6 g NaCl

Mass of Excess Reagent: 56.6 g HCl

Explanation:

To find the mass of NaCl, you need to (1) convert mass reactant to moles reactant (via molar mass), then (2) convert moles reactant to moles NaCl (via mole-to-mole ratio from equation coefficients), and then (3) convert moles NaCl to mass NaCl (via molar mass).

Molar Mass (NaHCO₃):

22.990 g/mol + 1.008 g/mol + 12.011 g/mol + 3(15.998 g/mol)

Molar Mass (NaHCO₃): 84.003 g/mol

Molar Mass (HCl): 1.008 g/mol + 35.453 g/mol

Molar Mass (HCl): 36.461 g/mol

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

100 g NaHCO₃            1 mole                  1 mole NaCl             58.443 g
------------------------  x  ------------------  x  ---------------------------  x  ----------------  =
                                   84.003 g            1 mole NaHCO₃            1 mole

=  69.6 g NaCl

100 g HCl            1 mole               1 mole NaCl          58.443 g
----------------  x  ------------------  x  -----------------------  x  ----------------  =
                           36.461 g             1 mole HCl              1 mole

=  160 g NaCl

Since NaHCO₃ results in the smaller amount of product, it is the limiting reagent. In other words, it is used up before the HCl has the chance to completely react. Therefore, the actual amount of NaCl produced is 69.6 grams.

To find the mass of the excess reagent, you need to calculate the amount of HCl actually used in the reaction. Then, you need to subtract that value from the total amount of HCl.

69.6 g NaCl             1 mole                1 mole HCl             36.461 g
---------------------  x  ------------------  x  -----------------------  x  ----------------  =
                                58.443 g            1 mole NaCl             1 mole

=  43.4 g HCl

Amount Given - Amount Reacted = Mass Excess

100 g HCl - 43.4 g HCl = 56.6 g HCl

In order to balance   H2   + O2  =  H2O you'll need to make sure the number of H and O atoms are the same on both sides of the chemical equation.  You do that by changing the coefficients (the numbers in front of atoms or compounds).

First, be sure to count all of the H and O atoms on each side of the chemical equation.  Once you know how many of each type of atom you have you can only change the coefficients (the numbers in front of atoms or compounds) in order to balance the equation.

Answer: Answer would be two

Explanation:

The empirical formula of the magnesium oxide formed is MgO

Here given data is piece of magnesium with a mass = 5.867 g  after the magnesium had combusted and allowed to cool down the product and mass = 8.956 g

The empirical formula is the simplest whole number ratio of atoms in a compound and the ratio of atoms is the same as the ratio of moles and when crucible react with magnesium and air means oxygen then magnesium reacts readily with oxygen in the air, to produce magnesium oxide then chemical reaction is written as follows:

2Mg + O₂ → 2MgO

and hence when it cool down automatically the mass of magnesium is more than 1st mass because in that oxygen of air are added and that's why MgO are made the empirical formula of the magnesium oxide formed is MgO

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Mass conversion from grams to kilograms

In physics and chemistry, it is common to express the mass of an object in grams (g) or kilograms (kg). To convert from grams to kilograms, we divide the mass in grams by 1000. This conversion allows us to express larger masses in a more manageable unit.

For example, in this case, the mass of a 250 ml beaker is 95.4 g. To convert this to kilograms, we divide 95.4 by 1000:

95.4 g / 1000 = 0.0954 kg

Therefore, the mass of the 250 ml beaker is 0.0954 kilograms.

It's important to note that the conversion factor between grams and kilograms is constant and equal to 1000. This means that regardless of the mass, the conversion will always result in the same factor of 1000.

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The precipitation hardening treatment is applied to an aluminum base alloy, which has been alloyed with half a point of both silicon and magnesium, and requires the morphology of the precipitated phase to be altered in the structure.

The treatment is known as the "precipitation hardening" treatment. This treatment is of interest in the construction of high-strength products, especially in the aviation and automotive sectors.Following are the steps of precipitation hardening treatment:Solution Treatment: In the initial step, the alloy is subjected to a high-temperature solution treatment, which brings the alloying elements into a state of homogeneous solid solution in the aluminum matrix.

Quenching: Following solution treatment, the alloy is quenched quickly to maintain the supersaturated condition and prevent the precipitation of the strengthening phase from occurring.Artificial Aging: The quenched alloy is subjected to a lower temperature for a longer period of time in this stage. This procedure results in the precipitation of the strengthening phase into a finely dispersed state, increasing the strength of the aluminum matrix.

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The concentration of hydroxide ions is

4.89 x 10^-10

Given:

[H3O+] = 2 x 10^-5 m

To Find:

pOH of solution

Solution:

pH = -log[H3O+]

pH = -log[2 x 10^-5]

pH = 4.69

pH + pOH = 14

pOH = 14 - 4.69 = 9.31

Now , we can calculate the concentration of hydroxide ions of the solution very easily as shown below :

[OH-] = 10^-pOH

[OH-] = 10^-9.31

[OH-] = 4.89 x 10^-10

Thus , the concentration of hydroxide ions is

Thus , the concentration of hydroxide ions is 4.89 x 10^-10

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Answer:

O A. The electrons orbit the protons at the atom's center

Explanation:

It was proved by Bohr that electrons are revolving in orbits which creates magnetic fields around the atom.

Answer:

True hope this is the correct answer if not sorry

Explanation:

Solutions with high pH values feel slippery. Option B is correct answer.

When a solution has a high pH, it means that it has a low concentration of hydrogen ions (H+) and a high concentration of hydroxide ions (OH-). The presence of these hydroxide ions is what gives the solution its basic or alkaline properties.

This is because they are basic or alkaline in nature. They do not turn litmus paper red, which is a property of acidic solutions. Tasting sour is also a property of acidic solutions. Giving off hydrogen gas when reacted with metal is a property of some acids, but not of solutions with high pH values.

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The orders of the reaction with respect to A, B, and C are (a) 1, (b) 2, and (c) 1, respectively.

Reaction is the process by which an organism responds to a stimulus, such as a chemical, physical, or environmental factor. Responses may be immediate or gradual, and can be positive or negative.

The rate equation for the reaction is given by:
Rate = k[A]x[B]y[C]z
where k is the rate constant, and x, y, and z are the orders of the reaction with respect to A, B, and C, respectively.
From the mechanism, we can see that the reaction is first order with respect to A, second order with respect to B, and first order with respect to C. Therefore, the orders of the reaction with respect to A, B, and C are (a) 1, (b) 2, and (c) 1, respectively.

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The best description for the crystals formed when oxygen freezes at very low temperatures is (e) molecular crystals.

This is because oxygen is a diatomic molecule, meaning it consists of two atoms that are held together by a covalent bond. When oxygen freezes, the molecules arrange themselves in a repeating pattern that forms a solid structure. This structure is held together by intermolecular forces, such as van der Waals forces, rather than by chemical bonds, which is why it is classified as a molecular crystal. Ionic, covalent network, metallic, and amorphous crystals have different types of bonding and structures, which do not apply to the formation of oxygen crystals.
The best description for crystals formed by oxygen (O2) when it freezes at very low temperatures is (e) molecular crystals. Molecular crystals are composed of molecules held together by weak intermolecular forces, such as van der Waals forces or hydrogen bonds. In the case of oxygen, the O2 molecules are covalently bonded within the molecule, but the interactions between the molecules in the crystal are not covalent, making molecular crystals the appropriate classification.

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Answer:

Explanation:

The density of water = 1 g/mL

Mass of water = 159.0 mL x 1 g/mL = 159.0 g

q = m x c x ΔT

7.84 kJ = 159.0 g x 4.184 J/g°C x ΔT

ΔT = 7.84 x 10^3 J / (159.0 g x 4.184 J/g°C)

ΔT = 11.8°C

Therefore, the temperature change is 11.9°C.

The two ways in which the physical state of matter can be changed are melting and freezing.

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To calculate the time it takes to recharge the battery, we need to use the concept of Faraday's laws of electrolysis.

Faraday's second law states that the amount of substance deposited or liberated at an electrode during electrolysis is directly proportional to the quantity of electricity passed through it.
First, let's find the number of moles of pb(s) consumed during discharge. We can use the molecular weight of pb to convert grams to moles:

1.00 g Pb x (1 mol Pb / 207.2 g Pb) = 0.004825 mol Pb.
Since 1.36 A of current flows through the battery during charging, we can calculate the number of Coulombs (C) of charge passed through the battery per second using the equation: Q = I * t, where Q is the charge in Coulombs and I is the current in Amperes. Thus, Q = (1.36 A) * (1 s) = 1.36 C.
Now, let's find the number of moles of pbso4(s) formed during discharge. Each mole of pb(s) consumes two moles of electrons to convert to pbso4(s). Therefore, the number of moles of pbso4(s) formed is equal to twice the number of moles of pb(s) consumed: 2 * 0.004825 mol Pb = 0.00965 mol PbSO4.
To calculate the time required for recharging, we divide the quantity of electricity passed (1.36 C) by the number of Coulombs required to produce 1 mol of pbso4(s). This can be calculated using Faraday's constant, F = 96485 C/mol. Thus, t = Q / (F * n), where t is the time in seconds, Q is the charge in Coulombs, F is Faraday's constant, and n is the number of moles of pbso4(s) formed.
t = (1.36 C) / (96485 C/mol * 0.00965 mol)

= 0.1456 s.
Finally, we convert the time to minutes by multiplying by 60 seconds per minute:

t = 0.1456 s * (1 min / 60 s)

= 0.00243 minutes.
Therefore, it will take approximately 0.00243 minutes (or about 0.146 seconds) to recharge the battery.

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To calculate the time it will take to recharge the battery, we need to use the concept of Faraday's law of electrolysis.

First, let's find the number of moles of PbSO4(s) that is formed by the consumption of 1.00 g of Pb(s) at the anode. To do this, we divide the mass of Pb(s) by its molar mass:

1.00 g Pb / 207.2 g/mol = 0.00482 mol Pb

Next, we can use the stoichiometry of the reaction to find the number of moles of electrons transferred during the conversion of PbSO4(s) back to Pb(s). The balanced equation shows that 2 moles of electrons are transferred for every 1 mole of PbSO4(s) formed:

0.00482 mol Pb * 2 mol e-/1 mol PbSO4 = 0.00964 mol e-

Now, we can use Faraday's law to calculate the total charge (Q) required to convert PbSO4(s) back to Pb(s):

Q = n * F

where n is the number of moles of electrons transferred and F is Faraday's constant (96485 C/mol).

Q = 0.00964 mol e- * 96485 C/mol = 932.194 C

Finally, we can calculate the time (t) required to recharge the battery using the equation:

t = Q / I

where I is the current produced by the alternator (1.36 A).

t = 932.194 C / 1.36 A = 685.15 s

To convert seconds to minutes, we divide by 60:

685.15 s / 60 s/min = 11.419 min

Rounded to three decimal places, it will take approximately 11.419 minutes to recharge the battery.

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Answer:

1500

Explanation:

I believe this is correct but am not sure, I shall update when I submit my quiz...

Panch Tattva refers to the five basic elements of nature - earth, water, air, fire, and space. To write a project report on this topic, you can follow the below-mentioned steps:

Introduction - Begin your report by introducing the concept of Panch Tattva and its importance in Hinduism and other religions.

Earth - Describe the element earth and its significance. Discuss the properties, uses, and importance of earth in our daily lives.

Water - Discuss the element water and its significance. Describe the properties, uses, and importance of water in our daily lives.

Air - Discuss the element air and its significance. Describe the properties, uses, and importance of air in our daily lives.

Fire - Discuss the element fire and its significance. Describe the properties, uses, and importance of fire in our daily lives.

Space - Discuss the element space and its significance. Describe the properties, uses, and importance of space in our daily lives.

Conclusion - Summarize the importance of Panch Tattva and its relevance in our daily lives.

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The molecular weight of ethanol (CH3CH2OH) is 46 and its density is 0.789 g/cm3

A. To calculate the molarity of ethanol in beer that is 5% ethanol by volume, we can use the following conversion:

5% ethanol by volume = 5 g ethanol / 100 mL beer

Since the density of ethanol is 0.789 g/cm3, this is equivalent to:

5 g ethanol / 100 mL beer = 5 g ethanol / (0.789 g/mL * 100 mL) = 0.0632 M ethanol

B. To calculate the molarity of ethanol in a person at a blood alcohol level of 0.08, we can use the following conversion:

80 mg ethanol / 100 mL blood = 80 mg ethanol / (0.100 L blood)

Since the molecular weight of ethanol is 46 g/mol, this is equivalent to:

80 mg ethanol / (0.100 L blood) = 80 mg ethanol / (0.100 L) * (1 g / 1000 mg) / (46 g/mol) = 0.0043 M ethanol

C. To calculate how many 12-oz (355-mL) bottles of 5% beer a 70-kg person can drink and remain under the legal limit, we can first calculate the volume of ethanol consumed and then compare it to the volume of blood in the person:

Volume of ethanol in one bottle of beer = 5 g ethanol / 0.0632 M ethanol = 79.2 mL ethanol

Volume of blood in a 70-kg person = 70 kg * 0.06 L/kg = 4.2 L

Total volume of ethanol that a 70-kg person can drink = 4.2 L * 0.0043 M ethanol / 0.0632 M ethanol = 0.48 L = 657.2 mL = 18.5 bottles

Therefore, a 70-kg person can drink 18.5 12-oz (355-mL) bottles of 5% beer and remain under the legal limit.

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The pH of the solution at the points where 24.5 mL and 25.5 mL of NaOH are added to a 25.00 mL sample of 0.100 M CH₃CO₂H can be calculated to be approximately 4.76, which is the pKa of acetic acid, indicating a buffer solution of CH₃CO₂H and CH₃CO₂Na at the equivalence point.

The titration is a process of determining the concentration of an acid or a base in a solution by adding a solution of known concentration of the opposite type until the equivalence point is reached, where the moles of acid and base are equivalent. In this case, CH₃CO₂H is a weak acid and NaOH is a strong base. The reaction between CH₃CO₂H and NaOH can be represented as follows:

CH₃CO₂H + NaOH → CH₃CO₂Na + H₂O

At the equivalence point, the moles of NaOH added are equal to the moles of CH₃CO₂H originally present in the solution. Therefore, the pH of the solution at the equivalence point will be equal to the pKa of CH₃CO₂H, which is 4.76, indicating a buffer solution of CH₃CO₂H and CH₃CO₂Na.

For points between 24.5 mL and 25.5 mL of NaOH, a weighted average of the moles of CH₃CO₂H can be used to calculate the pH, taking into account the varying concentrations of CH₃CO₂H and CH₃CO₂Na.

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A rigid container holds 2.60 mol of gas at a pressure of 1.00 atm and a temperature of 20.0 °C. The container's volume is 62.4 L.

To find the container's volume, we need to use the ideal gas law which states that PV = nRT where :

P is pressure

V is volume

n is the number of moles of gas

R is the gas constant

T is temperature.

We can rearrange the equation to solve for V as follows : V = (nRT)/P

We are given n = 2.60 mol, P = 1.00 atm, T = 20.0°C = 293 K (remember to convert Celsius to Kelvin by adding 273), and R = 0.0821 L·atm/(mol·K).

Plugging in these values and solving for V, we get :

V = (2.60 mol)(0.0821 L·atm/(mol·K))(293 K)/(1.00 atm) = 62.4 L

Therefore, the container's volume is 62.4 L.

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Answer:

386.66 g/mol  

Explanation:

To calculate the molar mass of a molecule, you add up the molar masses of its atoms.

Thus, for cholesterol. we get

27C = 27 × 12.011  =  324.297 g

46H = 46 ×   1.008 =    46.368

 1O =    1 × 15.999 =   15.999

                TOTAL = 386.655  g

To two decimal places, the molar mass of cholesterol is 386.66 g/mol

Answer:

C. Nitrogen

Explanation:

All of the other options are mixtures making them substances, but nitrogen is an element. (while gold is an element, there are often times that gold is mixed with other elements, creating a substance)

Answer:

5) You push hard on a heavy desk and try to move it. You do work on the desk: A.- Whether you move it or not, as long as you exert a force. B.- Only if the desktop moves. C.- Only if the desktop does not move. D.- Never; the desk does work on you. E.- None of the above. CAN YOU HELP ME?

B.- Only if the desktop moves.

Explanation:

No work is done if a force is exerted but no displacement occurs. A force perpendicular to the displacement does no generate work.

Answer:

person and earth since they are closer to the core ? maybe

Answer:

In general, anions are larger than the corresponding neutral atom, since adding electrons increases the number of electron-electron repulsion interactions that take place.

Explanation:

The duration of the ATP-PC system is 0-20 seconds, and the pathway utilized during the ATP-PC system is Anaerobic.

The ATP-PC system or phosphagen system is a metabolic pathway that offers energy to the cells for quick and explosive exercises. The ATP-PC system is the quickest way to produce ATP but is also the most limited. It has a duration of 0-20 seconds.

ATP-PC SystemThe ATP-PC system is utilized for activities that require high bursts of energy and quick contractions, such as sprinting, weightlifting, or jumping. This system is anaerobic, meaning it doesn't require oxygen. Creatine phosphate and adenosine triphosphate are stored in the muscle cells and can be converted into ATP when needed. These stored energy sources are rapidly utilized during the ATP-PC system, and ATP is produced from PC (phosphocreatine) breakdown.

ATP-PC system is a non-aerobic (anaerobic) metabolic pathway where PCr (phosphocreatine) is broken down to produce ATP and creatine. This pathway utilizes the muscles' stores of ATP and PCr and can provide energy to muscles for quick, explosive movements. It is not utilized during extended activities that require a low to moderate amount of energy.

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Answer:

The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.

Explanation:

answer:

what is the periodic table?

the the periodic table is:

basically an arragement all of the of the chemical elements organized by atomic number, from the element with the lowest atomic number, (hydrogen), to the element with the highest atomic number, (oganesson).

what are elements?

elements are:

a substance that is made entirely from one type of atom.

example: the element hydrogen is made from atoms containing a single proton and a single electron. if you change the number of protons an atom has, you change the type of element it is.

explanation:

i answered your questions & hope you have a great day!

pls give me brainliest <3

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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