Given:
BO3 + 3Mg → 3MgO + B
1. How many moles of Mg are required if 2 moles of B are produced?

\(\\ \tt\bull\rightarrowtail2 N_2+O_2\longrightarrow 2N_2O\)

Moles of N_2

\(\\ \tt\bull\rightarrowtail \dfrac{48.7}{14}=3.4mol\)

Molar mass of N_2O=44g/mol

Mass of N_2O formed

The mass of nitrous oxide that can be formed from 48.7 g of nitrogen is approximately 76.525 grams. To calculate the mass of nitrous oxide (N₂O) formed from a given mass of nitrogen (N₂), one needs to consider the balanced chemical equation.

N₂+ O₂ -> N₂O

The balanced equation tells us that 1 mole of nitrogen (N₂) reacts with 1 mole of oxygen (O₂) to produce 1 mole of nitrous oxide (N₂O).

Given mass of nitrogen (N₂) = 48.7 g

To find the number of moles of nitrogen (N₂), one divide the given mass by the molar mass of nitrogen, which is approximately 28.02 g/mol.

Number of moles of N₂= 48.7 g / 28.02 g/mol ≈ 1.738 mol

The balanced equation shows that 1 mole of nitrogen (N₂) reacts to form 1 mole of nitrous oxide (N₂O).

So, the number of moles of nitrous oxide (N₂O) formed is also approximately 1.738 mol.

To find the mass of nitrous oxide (N₂O), one multiply the number of moles by its molar mass, which is approximately 44.01 g/mol.

Mass of N₂O = 1.738 mol × 44.01 g/mol ≈ 76.525 g

Therefore, the mass of nitrous oxide formed from 48.7 g of nitrogen is approximately 76.525 grams.

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Answer: you can't really balance it doesn't make anything

Explanation:

The correct number of significant figures in the number \(9.080 \times 10^4\) is 4.

Significant figures refer to the digits in a number that are trustworthy and denote the amount of something, also known as the significant digits, accuracy, or resolution.

Only the digits allowed by the measurement resolution are dependable, hence only these can be important figures if a number expressing the outcome of a measurement (such as length, pressure, volume, or mass) has more digits than the number of digits allowed by the measurement resolution.

Some rules to understand significant figures:

1. Non-zero digits are always significant

2. Zeros between non-zero digits are always significant.

3. Leading zeros are never significant.

4. Trailing zeros are only significant if the number contains a decimal point

This number has 4 significant figures.

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Answer:

The cytoskeleton is responsible for contraction, cell motility, movement of organelles and vesicles through the cytoplasm, cytokinesis, establishment of the intracellular organization of the cytoplasm, establishment of cell polarity, and many other functions that are essential for cellular homeostasis and survival.

Explanation:

Answer: with enough heat, pressure, and time, the original sedimentary or igneous rock is changed to metamorphic rock.

Explanation:

Answer:

i like butting hole

Explanation:

mkrkr

The rate of reaction is directly proportional to the concentration of reactants &  temperature of the reaction.

So, 0.10M HCl at 80 o C will result in the fastest rate of reaction with 1.00g of zinc.

The rate of reaction is directly proportional to the concentration of reactants & temperature of the reaction So, 0.10M HCl at 80o C will result in the fastest rate of reaction with 1.00g of zinc.

What is temperature?

How hot or cold something is can be expressed numerically using the physical concept of temperature. Temperature is measured with a thermometer. Different temperature scales, which traditionally established various reference points and thermometric materials, are used to calibrate thermometers.

The rate of reaction is directly proportional to the concentration of reactants \& temperature of the reartion. So, $0.10\(\mathrm{M} \mathrm{HCl}$ at $80^{\circ} \mathrm{C}$ will result in $Q_{\text {astest rate of reaction with } 1.00 \mathrm{~g} \text { of }}$\)zinc.

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Answer:

proton :

a particale or atom containing a postive charge

nuutron

a particale or atom that contains a negative charge

electron :

a particale or atom with a negative chrage.

Explanation:

proton:

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

nuetron:

a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

elcetron:

a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

This is due to the fact that a substance's chemical qualities, such as its molecular form, polarity, and functional groups, govern how it behaves and interacts with other substances.

By illustrating the spatial arrangement of atoms and chemical bonds within the molecule, chemical structure establishes the molecular geometry of a compound. In doing so, chemists are given a crucial visual depiction of a chemical formula.

In a chemical reaction, reactants come into contact with one another, atoms in the reactants break their connections with one another, and then the atoms reorganise and form new bonds to create the products.

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The molar mass of the unknown organic compound is approximately 15.0 g/mol.

An organic compound can be described as any chemical compound that contains carbon-hydrogen or carbon-carbon bonds.

The molality of the solution can be calculated as follows:

M = moles of solute / mass of solvent (in g)

M = 1.65 g / (molecular weight of solute) / 15.00 g = 0.110 mol/kg

We will use the value of Kf_ for cyclohexane (20.0°C/m), the ΔT can be calculated as follows:

ΔT = Kf_ * m = 20.0°C/m * 0.110 mol/kg = 2.20°C

So the melting point of the solution is:

Tf_ (solution) = Tf_ (pure solvent) - ΔT = 6.6°C - 2.20°C = -0.1°C

The molecular weight of the solute can be calculated as follows:

molecular weight = moles of solute / molality = 1.65 g / (0.110 mol/kg) = 15.0 g/mol

Therefore, we can conclude that the molar mass of the unknown organic compound is approximately 15.0 g/mol.

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The reason the red level immediately went up when the thermometer was placed in the jar of hot water was 3.) molecules of the red liquid gain. Thermal energy from the hot water causes them to expand up the thermometer as they become less dense.

A glass tube filled with mercury that expands or contracts as the temperature changes serves as the medium through which a thermometer measures temperature. The tube and bulb are so small that the mercury can reach the temperature of what they are measuring extremely quickly.

The mercury molecules in the red liquid, which receive thermal energy from the hot water, expand up the thermometer as their density decreases.

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Answer:

$95

Explanation:

.75 x 120 = 90

90+5 = 95

The first equation is a balanced chemical equation because the number of atoms of each element on the left side of the equation is equal to the number of atoms of each element on the right side of the equation.

2HCl(aq) + Ca(OH)₂(aq) → CaCl₂(aq) + 2H₂O(l)

A balanced chemical equation is an equation that has the same number of atoms for each element on both sides of the equation. For example, the balanced chemical equation for photosynthesis is 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. This equation shows that the number of atoms of each element on the left side is equal to the number of atoms of the same element on the right side.

An atom is the smallest unit of matter that makes up all physical substances. It is composed of three smaller particles – protons, neutrons, and electrons. Protons have a positive charge and neutrons have no charge, while electrons have a negative charge. Protons and neutrons make up the nucleus of an atom, located at its center, while electrons orbit around it. Atoms of the same element all have the same number of protons, but they can differ in the number of neutrons and electrons.

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The term that the scientist would use in this case is partial pressure. Option D

The pressure that one particular gas component within a mixture of gases exerts is referred to as partial pressure. It is the pressure that the gas would experience at the same temperature if it were the only thing in the entire volume.

When researching gas mixtures, such as in gas laws, gas phase equilibria, and gas collecting methods, partial pressures are extremely crucial for the gas.

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There are differences in the observed solubility of calcium iodate (Ca(IO3)2) in different types of solvent due to its unique composition.

There differences in the observed solubility of Ca(IO3)2 into each of these solvents because calcium iodate (Ca(IO3)2) is not soluble in all types of solvent. In some solvents, it is fully soluble whereas in other solvents it is insoluble or slightly soluble.

For example, calcium iodate (Ca(IO3)2) is soluble in nitric acid but insoluble in alcohol due to its unique structure and composition so we can conclude that there are differences in the observed solubility of calcium iodate (Ca(IO3)2) in different types of solvent due to its unique composition.

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Answer: 7.45 g of \(Pb(NO_3)_2\) excess reagent are left over after the reaction is complete.

Explanation:

To calculate the number of moles, we use the equation:

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

a) \({\text{Number of moles of} KI}=\frac{7.55g}{166g/mol}=0.045moles\)

b) \({\text{Number of moles of} Pb(NO_3)_2}=\frac{9.06g}{331.2g/mol}=0.027moles\)

The balanced chemical reaction is :

\(Pb(NO_3)_2(s)+2KI(s)\rightarrow 2KNO_3(s)+PbI(s)\)

According to stoichiometry :

2 moles of \(KI\) require = 1 mole of \(Pb(NO_3)_2\)

Thus 0.045 moles of \(KI\) will require=\(\frac{1}{2}\times 0.045=0.0225moles\)  of \(Pb(NO_3)_2\)

Thus \(KI\) is the limiting reagent as it limits the formation of product and \(Pb(NO_3)_2\) is the excess reagent as (0.045-0.0225) = 0.0225 moles are left

Mass of \(Pb(NO_3)_2=moles\times {\text {Molar mass}}=0.0225moles\times 331.2g/mol=7.45g\)

Thus 7.45 g of \(Pb(NO_3)_2\) of excess reagent are left over after the reaction is complete.

After the complete neutralization reaction occurs, excess hydroxide ion is left unreacted and concentration of the hydroxide ion, [OH-] is 0.02 M.

The hydroxide ion concentration is the amount in moles of hydroxide ion in a solution.

The hydroxide ion concentration is written as [OH-].

The equation of the reaction is given below:

\(HBr(aq) + KOH(aq) \rightarrow KBr(aq) + H_2O(l) \\ \)

1 mole of HBr reacts with 1 mole of KOH

Moles of HBr = 40 mL × 0.1 M = 4 mmmoles

Moles of KOH = 60 mL × 0.1 M = 6 mmoles

Moles of [OH-] = 6 - 4 = 2 mmoles

Volume of solution = 100 mL

[OH-] = 2mmoles/100 mL = 0.02 M

Therefore, the concentration of the hydroxide ion, [OH-] is 0.02 M.

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Height of a mountain is 5348.9 meter.

1 kilometer is equal to 1000 meter.

The meter, symbol m, is the primary unit of period in the international system of gadgets, although its prefixed paperwork also are used relatively regularly.

A meter is a general metric unit identical to about three feet 3 inches. This means that a meter is part of the metric gadget of dimension. Guitars, baseball bats, and backyard sticks are examples of items which might be approximately one meter lengthy. Meters also are used to measure distances in races, inclusive of strolling and swimming.

Meter readings tell power suppliers how a lot gasoline and energy you are the use of. In case you do not give your provider meter readings they may have to guess your usage. You typically turn out to be paying too much or too little while this occurs.

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Answer:

The molar mass of sodium oxide (Na20) is 61.98 grams.

The molar mass of the compound sodium oxide is 61.98≅62 gram/mole.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.For sodium oxide it is calculated as, 23×2+ 16=62 g/mole.

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A thermochemical equation can be written by expressing the heat evolved or absorbed in terms of the enthalpy change ΔH. Here ΔH for the following reaction +88.2 kJ. The correct option is A.

A chemical equation which indicates the heat change occuring during the reaction is defined as the thermochemical equation. In thermochemical equations, physical states of the reactants and products should be specified.

Here the given reaction 4 AlCl₃ (s) + 3 O₂ (g) ⇒ 2 Al₂O₃ (s) + 6 Cl₂ (g) is reversed as 1 /3 Al₂O₃ (s) + Cl₂ (g) ⇒ 2/3 AlCl₃ (s) + 1/2 O₂ (g) and multiplied by 1/6.

So the new enthalpy is +88.16 ≈ 88.2 kJ

Thus the correct option is A.

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Complete question:

Imagine a book that is falling from a shelf. At a particular moment during its fall, the book has a kinetic energy of 25 J.

What was the initial potential energy of the book, and what is its total kinetic energy at the instant just before it strikes the floor?

Answer:

the initial potential energy = 25 J

the total kinetic energy is 50 J

Explanation:

At any instant of fall the potential energy will be converted to kinetic energy.

At the instant when the kinetic energy is 25 J, the initial potential energy has been converted to 25 J

Thus, the initial potential energy = 25 J

The instant just before it strikes the floor, the potential energy has been converted to kinetic energy.

Total kinetic energy = 25 J + 25 J = 50 J

Taking into account the definition of sensible heat, the mass of copper in the sample is 277.06 grams.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure (physical state), it is called sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of sensible heat:

1600 J = 0.385 J/gC× m× 15 C

Solving:

1600 J = 5.775 J/g× m

1600 J÷ 5.775 J/g= m

277.06 g= m

Finally, the mass of copper in this case is 277.06 grams.

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Based on the evidence in the solubility graph, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be saturated.

An unsaturated solution is a solution which contains less solute than it can actually dissolved in a given volume of solvent at a given temperature.

A solubility curve or graph provides information about the solubility of a solute at a given temperature.

From the solubility graph given, at 20°C, less than 10 g of Ce2(SO4)3 will be dissolved in 100 mL of water.

Therefore, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be saturated.

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The result of the computation when you follow the steps is 1.699.

A logarithm is a mathematical function that represents the exponent or power to which a specific base must be raised to obtain a given number. In simpler terms, it answers the question: "To what power must we raise a base number to obtain a certain value?"

What you should do is that on your calculator, you could press the logarithm key and then put in the value that has been shown and then the result would be displayed on your calculator.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

the answer i believe is increased nutritional value of crops

Explanation:

Answer: increased nutritional value of crops

Explanation:) edge 2022

Answer:

Water - Formula: H2O = Hydrogen2 + Oxygen. ...

Hydrogen Peroxide - Formula: H2O2 = Hydrogen2 + Oxygen2 ...

Salt - Formula: NaCl = Sodium + Chlorine. ...

Baking Soda - Formula: NaHCO3 = Sodium + Hydrogen + Carbon + Oxygen3 .

Octane - Formula: C8H18 = Carbon8 + Hydrogen18

are 5 examples

Explanation:

The best description of cis-trans isomers is that they differ in their spatial arrangement around inflexible double bonds. Option E is correct.

Specifically, cis-trans isomers are a type of stereoisomers that have the same molecular formula and the same covalent bonds but differ in the spatial arrangement of their atoms due to the inflexibility of a double bond. In cis isomers, the two substituents on each carbon atom are on the same side of the double bond, while in trans isomers, the two substituents on each carbon atom are on opposite sides of the double bond.

This results in different physical and chemical properties for the two isomers. For example, cis and trans isomers of some compounds may have different boiling points, melting points, and reactivities.  Cis-trans isomerism is an important concept in organic chemistry as it affects the properties and behavior of molecules and can have significant implications for their biological activity, environmental fate, and industrial applications. Option E is correct.

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Answer: B. 430 K

Explanation:

According to Gibb's equation:

\(\Delta G=\Delta H-T\Delta S\)

\(\Delta G\) = Gibbs free energy  

\(\Delta H\) = enthalpy change  = +62.4 kJ/mol

\(\Delta S\) = entropy change  = +0.145 kJ/molK

T = temperature in Kelvin

\(\Delta G\)  = +ve, reaction is non spontaneous

\(\Delta G\)  = -ve, reaction is spontaneous

\(\Delta G\)  = 0, reaction is in equilibrium

\(\Delta H-T\Delta S=0\) for reaction to be spontaneous

\(T=\frac{\Delta H}{\Delta S}\)

\(T=\frac{62.4kJ/mol}{0.145kJ/molK}=430K\)

Thus the Reaction is spontaneous when temperature is 430 K.

Answer:

430 K

Explanation:

i just took the test on a pex :)