hydrogen cyanide, hcn, is a poisonous gas. the lethal dose is approximately 300 hcn per kilogram of air when inhaled. (a) calculate the amount of hcn that gives the lethal dose in a small laboratory room measuring . the density of air at is 0.00118 (b) if the hcn is formed by reaction of with an acid such as what mass of nacn gives the lethal dose in the room?

Answer:

The black solid is magnetic due to the special property of iron called ferromagnetism

6.9 g

Explanation:

The substance FeS is magnetic despite of the fact Fe^2+ is spin paired due to the special magnetic property of iron called ferromagnetism.

The equation of the reaction is;

Fe(s) + S(s) ----> FeS(s)

Number of moles of Fe = 5g/56g/mol = 0.089 moles

Since the reaction is 1:1, 0.089 moles of FeS is formed

For Sulphur;

Number of moles of sulphur = 2.5g/32 g/mol = 0.078 moles

Since the reaction is 1:1, 0.078 moles of FeS is formed

Hence sulphur is the limiting reactant.

So, mass of FeS produced = 0.078 × 87.91 g/mol = 6.9 g

The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].

We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M.

Given reaction obeys the rate law, rate=k[A]²[B].

Here, the initial concentration of A= 0.10 M,

initial concentration of B = 0.05 M, and

rate constant, k = 2.0 × 10⁻⁴ M⁻¹s⁻¹

We have to find the concentration of A, after 30 seconds.

To find the concentration of A, we need to know the rate at 0.10 M and 0.05 M. Therefore, we have to calculate the rates at these concentrations.

rate1 = k[A]²[B]

= (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.10 M)²(0.05 M)

= 1.0 × 10⁻⁷ M/srate2

= k[A]²[B] = (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.09 M)²(0.04 M)

= 6.48 × 10⁻⁸ M/s

Using the integrated rate law for a second-order reaction: [A] = [A]₀ - kt where [A]₀ = initial concentration of A, k = rate constant, and t = time in seconds.

We know [A]₀ = 0.10 M and k = 2.0 × 10⁻⁴ M⁻¹s⁻¹.

Substituting the values in the above equation, we get: [A] = [A]₀ - kt= 0.10 M - (2.0 × 10⁻⁴ M⁻¹s⁻¹)(30 s)≈ 0.0934 M

Therefore, the concentration of A in the vessel after 30 seconds is 0.0934 M.

This question requires us to calculate the concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].

We are given the initial concentration of A and B and the rate constant of the reaction. To find the concentration of A after 30 seconds, we need to calculate the rates at the initial concentrations of A and B.

Using the integrated rate law for a second-order reaction, we can find the concentration of A at any given time. We substitute the given values in the formula and solve for [A]. We get the concentration of A as 0.0934 M after 30 seconds. This calculation is based on the assumption that no other reaction is important.

The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B]. We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M. This calculation assumes that no other reaction is important.

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Answer:

Temperature does not affect the radioactive decay

Explanation:

because Temperature has no factor in radioactivity

Good Luck

Answer:

Here's what I got.

Explanation:

Interestingly enough, I'm not getting

0.0341% w/v

either. Here's why.

Start by calculating the percent composition of chlorine,

Cl

, in calcium chloride, This will help you calculate the mass of chloride anions,

Cl

−

, present in your sample.

To do that, use the molar mass of calcium chloride, the molar mass of elemental chlorine, and the fact that

1

mole of calcium chloride contains

2

moles of chlorine atoms.

2

×

35.453

g mol

−

1

110.98

g mol

−

1

⋅

100

%

=

63.89% Cl

This means that for every

100 g

of calcium chloride, you get

63.89 g

of chlorine.

As you know, the mass of an ion is approximately equal to the mass of the neutral atom, so you can say that for every

100 g

of calcium chloride, you get

63.89 g

of chloride anions,

Cl

−

.

This implies that your sample contains

0.543

g CaCl

2

⋅

63.89 g Cl

−

100

g CaCl

2

=

0.3469 g Cl

−

Now, in order to find the mass by volume percent concentration of chloride anions in the resulting solution, you must determine the mass of chloride anions present in

100 mL

of this solution.

Since you know that

500 mL

of solution contain

0.3469 g

of chloride anions, you can say that

100 mL

of solution will contain

100

mL solution

⋅

0.3469 g Cl

−

500

mL solution

=

0.06938 g Cl

−

Therefore, you can say that the mass by volume percent concentration of chloride anions will be

% m/v = 0.069% Cl

−

−−−−−−−−−−−−−−−−−−−

I'll leave the answer rounded to two sig figs, but keep in mind that you have one significant figure for the volume of the solution.

.

ALTERNATIVE APPROACH

Alternatively, you can start by calculating the number of moles of calcium chloride present in your sample

0.543

g

⋅

1 mole CaCl

2

110.98

g

=

0.004893 moles CaCl

2

To find the molarity of this solution, calculate the number of moles of calcium chloride present in

1 L

=

10

3

mL

of solution by using the fact that you have

0.004893

moles present in

500 mL

of solution.

10

3

mL solution

⋅

0.004893 moles CaCl

2

500

mL solution

=

0.009786 moles CaCl

2

You can thus say your solution has

[

CaCl

2

]

=

0.009786 mol L

−

1

Since every mole of calcium chloride delivers

2

moles of chloride anions to the solution, you can say that you have

[

Cl

−

]

=

2

⋅

0.009786 mol L

−

1

[

Cl

−

]

=

0.01957 mol L

−

This implies that

100 mL

of this solution will contain

100

mL solution

⋅

0.01957 moles Cl

−

10

3

mL solution

=

0.001957 moles Cl

−

Finally, to convert this to grams, use the molar mass of elemental chlorine

0.001957

moles Cl

−

⋅

35.453 g

1

mole Cl

−

=

0.06938 g Cl

−

Once again, you have

% m/v = 0.069% Cl

−

−−−−−−−−−−−−−−−−−−−

In reference to the explanation you provided, you have

0.341 g L

−

1

=

0.0341 g/100 mL

=

0.0341% m/v

because you have

1 L

=

10

3

mL

.

However, this solution does not contain

0.341 g

of chloride anions in

1 L

. Using

[

Cl

−

]

=

0.01957 mol L

−

1

you have

n

=

c

⋅

V

so

n

=

0.01957 mol

⋅

10

−

3

mL

−

1

⋅

500

mL

n

=

0.009785 moles

This is how many moles of chloride anions you have in

500 mL

of solution. Consequently,

100 mL

of solution will contain

100

mL solution

⋅

0.009785 moles Cl

−

500

mL solution

=

0.001957 moles Cl

−

So once again, you have

0.06938 g

of chloride anions in

100 mL

of solution, the equivalent of

0.069% m/v

.

Explanation:

i think this is it

The pH of a 0.0715 MLiOH solution is 12.08

Lithium hydroxide (LiOH) is a solid that dissolves in water to form a strong base. When it dissolves in water, it separates into Li⁺ and OH⁻ ions. In this situation, it will help us to calculate the pH of a solution formed by 0.0715 moles of LiOH diluted to 1.0 liter. To begin, we'll use stoichiometry to calculate the hydroxide ion concentration, which is the amount of OH⁻ produced by LiOH. Afterward, we'll use this information to calculate the pH of the solution. In summary, the pH of a 0.0715 mol L-1 LiOH solution is 12.08.

When Lithium hydroxide (LiOH) is dissolved in water, it dissociates into Li⁺ and OH⁻ ions, the dissociation of the strong base leads to the formation of OH⁻ ions. The hydroxide ion concentration, which is the number of OH⁻ ions formed by LiOH, can be determined using stoichiometry, it is equal to the initial LiOH concentration. A 0.0715 M LiOH solution, for example, will have a hydroxide ion concentration of 0.0715 mol L-1. The hydroxide ion concentration and the self-ionization of water, on the other hand, determine the pH of the solution. For a 0.0715 M LiOH solution, the pH is calculated to be 12.08.

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Stoichiometry is a branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It involves using chemical equations, which are like recipes, to determine the ratio of ingredients needed for a reaction.

The mole is a unit of measurement in chemistry that is used to ensure that the appropriate ratio of reacting particles is used for a particular reaction. A mole represents a certain number of particles, which is called Avogadro's number (6.02 x 10²³). By knowing the number of moles of a reactant, one can determine the number of moles of another reactant needed for the reaction to proceed in the appropriate ratio. This is important because chemical reactions are all about the ratio of reactants, not the absolute amounts.

Moles can also be used to determine the amount of product that will be generated by a reaction. This is done by using stoichiometry, which involves balancing the chemical equation and using mole ratios to calculate the amount of product that will be formed. This is important for industries that produce chemicals on a large scale, as they need to know how much product they will get from a certain amount of reactants.

In summary, stoichiometry is a fundamental concept in chemistry that involves using chemical equations and mole ratios to determine the appropriate ratio of ingredients for a reaction and the amount of product that will be generated. The mole is a unit of measurement that plays a crucial role in stoichiometry, as it ensures that reactions proceed in the correct ratio of reactants.

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Answer:

38.7 g is the answer to your question. Your welcome:)

The given statement, "If a mineral fizzes when it comes into contact with acetic acid, it is probably composed of calcium carbonate (CaCO₃)" is true because When a mineral fizzes upon contact with acetic acid, it is a strong indication that the mineral is composed of calcium carbonate (CaCO₃).

The fizzing occurs due to the release of carbon dioxide gas (CO₂) during a chemical reaction between the acid and the carbonate compound. Calcium carbonate is a common mineral found in various forms such as limestone, marble, and chalk. It is insoluble in water but reacts readily with acids, including acetic acid, which is the main component of vinegar.

The reaction between calcium carbonate and acetic acid can be represented by the following equation:

CaCO₃ + 2CH₃COOH → Ca(CH₃COO)₂ + H₂O + CO₂

In this reaction, calcium carbonate reacts with acetic acid to form calcium acetate, water, and carbon dioxide gas. The release of carbon dioxide gas is responsible for the fizzing observed when the mineral comes into contact with the acid.

Therefore, if a mineral fizzes when it encounters acetic acid, it is likely composed of calcium carbonate (CaCO₃). This fizzing reaction is often used as a simple and effective test to identify the presence of calcium carbonate in minerals or rocks.

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A protein mixture is commonly applied to a HIC column under high salt conditions, and the protein of interest is eluted with a buffer of decreasing ionic strength.

Structured salts added to the equilibration buffer and sample promote ligand-protein interactions in HIC. The amount of bound protein decreases as the salt concentration decreases, as does the risk of protein precipitation at lower ionic strength.

Despite the fact that sodium, potassium, or ammonium sulfates have a higher precipitation effect, these salts effectively promote ligand-protein interactions in HIC. Most bound proteins are eluted by washing with water or a dilute buffer with a pH close to neutral.

What exactly is HIC?

Hydrophobic interaction chromatography (HIC) is a technique used to separate molecules based on their hydrophobicity. HIC is a useful separation technique for purifying proteins while retaining biological activity due to the use of less denaturing conditions and matrices.

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Answer:

The Internet started in the 1960s as a way for government researchers to share information. ... This eventually led to the formation of the ARPANET (Advanced Research Projects Agency Network), the network that ultimately evolved into what we now know as the Internet.

The average atomic mass is calculated on the basis of the average mass of all the isotopes present in the nature. Here the average mass is closer to 50 amu.

The isotopes are defined as the chemical elements which have the same atomic numbers but different mass numbers. The number of protons or electrons in them are same but the number of neutrons will be different.

₅₀X = 70% = 0.70

₅₄X = 30% = 0.30

Average atomic mass = (50 × 0.70) + (54 × 0.30) = 51.2

Thus the average atomic mass is closer to the first isotope of mass 50 amu. Because of the higher percent abundance of this isotope.

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Nothing changes; it stays the same.

What does it imply to claim that a reaction is being catalysed by an enzyme?

Enzymatic catalysis of a reaction involving two substrates. The two substrates are brought together in the correct direction and location to react with one another using the template provided by the enzyme.

How do enzymes decide what to eat for fuel?

Finding the peptide sequences that proteases cleave in vitro—or, more specifically, which amino acids span the cleavage site and are recognised by the enzyme's active site—is one method of identifying prospective protease substrates. The proteome is then searched for substrates using these sequences, much like partial licence plate numbers

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Answer:

135.80 g of Ag

Explanation:

\(40gCu *\frac{1mol Cu}{63.546g Cu} *\frac{2mol Ag}{1molCu} *\frac{107.868g Ag}{1mol Ag}\)

~ 135.80 g of Ag

Answer:

XZ2

Explanation:

I think lang po

1 mols of Aluminium ion forms 1 mol aluminium phosphate

Molar mass of AlPO_4

Moles of AlPO_4

Moles of Al3+=57.5µmol

To determine the number of moles of hydrogen in a sample of carvone (CH3OC(CH3)), we need to analyze the molecular formula and count the number of hydrogen atoms present.

Given:

Molecular formula of carvone: CH3OC(CH3)

Number of moles of carbon (C): 0.0503 moles

From the molecular formula, we can identify the number of hydrogen atoms.

The number of hydrogen atoms in CH3OC(CH3) can be determined as follows:

Total number of hydrogen atoms = (3 hydrogen atoms in CH3) + (2 hydrogen atoms in CH3 within (CH3))

Total number of hydrogen atoms = 3 + 2 = 5 hydrogen atoms

To calculate the moles of hydrogen, we need to consider the mole ratio between hydrogen and carbon. Since there are 5 hydrogen atoms for every 1 carbon atom in carvone, the moles of hydrogen can be calculated as:

Moles of hydrogen = Number of moles of carbon * (5 moles of hydrogen / 1 mole of carbon)

Moles of hydrogen = 0.0503 moles * (5 moles of hydrogen / 1 mole of carbon)

Moles of hydrogen = 0.0503 moles * 5

Moles of hydrogen = 0.2515 moles

In a sample of carvone with 0.0503 moles of carbon, there are approximately 0.2515 moles of hydrogen.

By examining the molecular formula of carvone (CH3OC(CH3)), we can determine the number of hydrogen atoms present by counting the hydrogen atoms within each functional group. The CH3 group contributes 3 hydrogen atoms, and within the (CH3) group, there are 2 additional hydrogen atoms. Combining these, we find a total of 5 hydrogen atoms. To determine the moles of hydrogen, we multiply the number of moles of carbon by the mole ratio between hydrogen and carbon, which is 5 moles of hydrogen per 1 mole of carbon. By performing the calculation, we find that the sample contains approximately 0.2515 moles of hydrogen.

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The molar mass of Mg(OH)2 is 58.3 g mol−1.

The relative atomic mass of an element indicates its mass compared to the mass of atoms of other elements. Carbon has a relative atomic mass of 12 and magnesium has a relative atomic mass of 24. This means that each magnesium atom has twice the mass of a carbon atom. Atomic weights related to 1/12th the mass of a carbon atom are called relative atomic masses.

It is called the relative atomic mass because it compares the atomic mass to 1/12 the mass of a carbon atom. Relative mass is the average atomic mass of all isotopes present expressed as a percentage, and absolute mass is the sum of proton number and neutron mass. As the speed of an object approaches the speed of light, its relativistic mass m becomes infinite.

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Answer: it definitely did help me a lot but sometimes it doesn’t make me happy like i will get stressed but it passes.

Explanation:

Answer. Speed is the rate of change of position expressed as distance travelled per unit of time

give brainliest if right

Answer:

distance

Explanation:

The number of s orbitals present in one energy level of an atom is 1. There can be only one s orbital present in a single energy level.

What is an s orbital?

An s-orbital is a region of space around the nucleus where an electron is most likely to be found. An s-orbital is a spherical shape that is symmetrical around the nucleus of an atom.

What is an energy level?

An electron shell is another name for an energy level. It's a portion of an atom where electrons are found. Electrons, which are negatively charged, are constantly moving around the nucleus of an atom in energy levels. Electrons that are farther away from the nucleus are located in higher energy levels.

What is an electron configuration?

The arrangement of electrons in an atom is referred to as its electron configuration. In terms of electron shells, subshells, and orbitals, it reveals how the electrons are arranged.

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If ∆H is positive, indicating an endothermic reaction, the higher temperature would further favor the products. On the other hand, if ∆H is negative, indicating an exothermic reaction, the higher temperature would favor the reactants.

a) The stoichiometric table for the reaction is as follows:

Initial (mol) Change (mol) Final (mol)

A A₀ -3X A₀ - 3X

B 0 X X

C 0 2X 2X

Here, A₀ represents the initial moles of A, X represents the conversion of A.

b) To determine the concentration of A, B, and C at 95% conversion, we need to calculate the final moles of A, B, and C using the stoichiometric table.

At 95% conversion, X = 0.95. Substituting this value into the stoichiometric table, we get:

Final moles of A = A₀ - 3X = A₀ - 3(0.95) = A₀ - 2.85

Final moles of B = X = 0.95

Final moles of C = 2X = 2(0.95) = 1.9

c) If the reaction is conducted at a higher temperature while maintaining the same pressure, it will affect the reaction rate and equilibrium position. In general, increasing the temperature increases the reaction rate, leading to higher conversions in a given time. At the same time, it can also affect the equilibrium position by shifting it towards the products or reactants, depending on the reaction's enthalpy change.

In this case, if the reaction is conducted at a higher temperature, the concentration of B and C at 95% conversion may increase compared to the previous experiment conducted at 75°C. The increased temperature would favor the forward reaction, resulting in a higher yield of products B and C at equilibrium.

However, the exact effect on the concentrations of B and C would depend on the specific thermodynamics of the reaction, including the enthalpy change (∆H).

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Answer:

B. It's a physical change because the water and the salt kept their original properties.

Explanation:

Even though it tastes like salty water, the salt is still present, just in smaller molecules. It can be brought back so it is a physical change.

The temperature at which the pressure will be equal to 1.75 atm, given that the tank has an initial pressure of 101325 Pa is 257.25 degrees celsius

First, we shall list out the given parameters from the question. This is shown below:

The final temperature can be obtain as follow:

P₁ / T₁ = P₂ / T₂

1 / 303 = 1.75 / T₂

Cross multiply

1 × T₂ = 303 × 1.75

T₂ = 530.25 K

Subtract 273 to obtain answer in degree celsius

T₂ = 530.25 – 273 K

T₂ = 257.25 degrees celsius

Thus, the temperature required is 257.25 degrees celsius

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Answer:

b

Explanation:

I think B because its saying that perhaps watering with salt water would make them grow faster, you don't know yet unless tested.

Answer:

covalent bonds

Explanation:

Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.

(if it is still confusing i have another way of explaining so jus let me know :)

Answer: Covalent

Explanation:

Nitrogen has 7 electrons, 7 protons, and 7 neutrons in its most common isotope.

What are the number of electrons, protons, and neutrons in nitrogen?

Nitrogen (N) is a chemical element with an atomic number of 7, which means it has 7 protons in its nucleus. Since nitrogen is a neutral element, it also has 7 electrons orbiting around the nucleus, balancing out the positive charge of the protons. The most common isotope of nitrogen has 7 neutrons in its nucleus, giving it a mass number of 14 (since the mass number is equal to the sum of protons and neutrons in the nucleus).

However, there are other isotopes of nitrogen that can have different numbers of neutrons. The presence or absence of neutrons in an atom's nucleus can affect its stability and reactivity, making isotopes important in various scientific and industrial applications.

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The type of battery used in the Prius, a hybrid car produced by Toyota, is a Nickel-Metal Hydride (NiMH) battery. According to the maker's claims, this battery should not have to be recharged or replaced.

The Prius originally used Nickel-Metal Hydride (NiMH) batteries for its hybrid powertrain. NiMH batteries are known for their higher energy density compared to conventional lead-acid batteries. They are capable of storing and delivering a significant amount of energy, making them suitable for powering the electric motor in hybrid vehicles like the Prius. The manufacturer claims that the NiMH battery in the Prius is designed to last for the lifetime of the car without needing to be recharged or replaced.

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Answer:

1.34 34343 he did

Explanation:

i did the test

Answer:

0.85

Explanation: