Calculate the answer to the following questions and round to the correct # of
significant digits
518,000/2,500

We have that for the Question, it can be said that the percentage of arsine molecules have de- composed is

Percentage of arsine molecules=79.62%

From the question we are told

A sample of gaseous arsine (AsH3) in a 460 mL flask at 332 Torr and 223 K, is heated to 437 K, at which temperature arsine decom- poses to solid arsenic and hydrogen gas. The flask is then cooled to 273 K, at which temperature the pressure in the flask is 488 Torr. What percentage of arsine molecules have de- composed?

Answer in units of %

.

Generally the equation for the ideal gas   is mathematically given as

\(PV=nRT\\\\Therefore\\\\(\frac{296}{760})*(0.465)=n*0.0821*213\\\\n=0.010356\\\\\)

Hence

\(\frac{511}{760}*0.6165=nf*0.0821*263\\\\nf=0.014479\\\\0.010356-2x+3x=0.014479\\\\X=0.004123moles\\\\\)

Therefore

\(Percentage\ of\ arsine\ molecules=\frac{0.004123*2}{0.010356}*100\)

Percentage of arsine molecules=79.62%

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Answer:

i think that it is A

Explanation:

the other ones did not make as much sense

A scientist who studies the genetic engineering of crops most likely attempting how more stable supply of crops be created. so, option A is correct.

Genetic engineering, often known as genetic alteration, is a technique that modifies an organism's DNA using technology developed in labs. This could entail altering a single base pair (A-T or C-G), erasing a section of DNA, or incorporating a new DNA sequence.

In order to fix genetic flaws and hence prevent or treat hereditary illnesses, gene therapy aims to change specific genes.

The goal of genetic engineering is to alter the genes to increase the organism's capabilities beyond what is typical.

The term "genetic engineering" originally applied to a number of methods for modifying or altering living things through their heredity and reproductive processes.

Thus, option A is correct.

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Answer:

581 Joules.

Explanation:

Using the formula;

Q = m × c × ∆T

Where;

Q = amount of heat absorbed (J)

m = mass of substance (g)

c = specific heat capacity (J/g°C)

∆T = change in temperature (°C)

According to the information provided in this question;

Q = ?

mass of ice = 15.9g

initial temperature = -4°C

final temperature = 14°C

Hence, ∆T = 14 - (-4) = 14 + 4 = 18°C

specific heat capacity (c) of ice in J/g°C = 2.03 J/g°C

Using Q = m × c × ∆T

Q = 15.9 × 2.03 × 18

Q = 32 × 18

Q = 581 Joules.

The empirical formula for a substance that is 12.67 % aluminum, 19.73% nitrogen, 67.60% oxygen is Al(NO₃)₃.

given that :

aluminum = 12.67 %  = 12.67 g

nitrogen = 19.73 % = 19.73 g

oxygen = 67.60 % = 67.60 g

molar mass of aluminum = 12.67 / 26.98

                                         = 0.46 mol

molar mass of nitrogen = 19.73 / 14

                                       = 1.40 mol

molar mass of oxygen = 67.60 / 16

                                      = 4.2 mol

divided by the smallest one , we get:

aluminum = 0.46 / 0.46 = 1

nitrogen = 1.40 / 0.46 = 3

oxygen = 4.2 / 0.46 = 9

The empirical formula is = Al(NO₃)₃

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Answer:

well the answer is 99.2lbs I know that

Explanation:

To calculate the percent yield, we need to compare the actual yield to the theoretical yield. The theoretical yield is the amount of product that would be obtained if the reaction went to completion based on the stoichiometry of the balanced equation.

First, let's determine the molar mass of CaCO3 (limestone) and CaO (quicklime):

- Molar mass of CaCO3 = 40.08 g/mol (molar mass of Ca) + 12.01 g/mol (molar mass of C) + (3 * 16.00 g/mol) (molar mass of O) = 100.09 g/mol

- Molar mass of CaO = 40.08 g/mol (molar mass of Ca) + 16.00 g/mol (molar mass of O) = 56.08 g/mol

Next, we can calculate the theoretical yield of CaO:

The molar ratio between CaCO3 and CaO is 1:1 according to the balanced equation. Therefore, the mass of CaO produced is the same as the mass of CaCO3 used.

The theoretical yield of CaO is 3.3 × 10^3 g.

Now we can calculate the percent yield:

Percent Yield = (Actual Yield / Theoretical Yield) * 100

Percent Yield = (1 × 10^3 g / 3.3 × 10^3 g) * 100

Percent Yield = 30.30%

Therefore, the percent yield of CaO in this reaction is 30.30%.

The first solution provided by meguelratatouille came close to the correct answer, but erred in assuming that equal moles implies equal mass. The following discussion corrects this mistake.

To determine the percent yield, we must compare the actual yield to the theoretical yield.

Theoretical Yield

From the balanced chemical equation we have:

CaCO3(s) --> CaO(s) + CO2(g)

It is necessary to know the molar mass of CaCO3 and CaO to determine the amount of CaO produced from a given amount of CaCO3:

Molar mass CaCO3 = 100.09 g/mol

Molar mass CaO = 56.08 g/mol

Then, to find the total mass of CaO produced by 3.3 x 10^3 g of CaCO3 reactant, we calculate:

3.3 x 10^3 g CaCO3  
x 1 mol CaCO3 / (100.09 g/mol CaCO3)
x 1 mol CaO / (1 mol CaCO3)
x 56.08 g CaO / (1 mol CaO)
-----------------------------------
1848 g CaO

which we report as 1.8 x 10^3 g CaO after applying significant figures.

Actual Yield

Finally, the percent yield is given by dividing the actual yield by the theoretical yield we just computed:

(1 x 10^3 g) / (1.8 x 10^3 g) x 100% = 55.6% = 56%

Answer:

A feedback mechanism is a physiological regulation system in a living body that works to return the body to its normal internal state, commonly known as homeostasis. ... The term “feedback mechanism” was first used in cybernetics to characterize a control system's ability to change its output in response to an input.

Explanation:

The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.

To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.

The z-value is calculated as:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.

Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.

For vinyl gloves:

Sample size (n₁) = 240

Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)

For latex gloves:

Sample size (n₂) = 240

Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)

We will calculate the z-value using the formula:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions.

p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629

p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071

Calculating the z-value:

z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))

z ≈ 13.239

The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.

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The General Hazardous Materials Behavior Model event that involves the material being free to travel or disperse, allowing it to move outward from the source is known as dispersion.

This is the third event in the model and occurs after the release and contact events. During dispersion, the material is no longer contained and can spread through the air, water, or ground.

This can potentially cause harm to people, animals, and the environment. It is important to understand and predict the dispersion of hazardous materials in order to prevent or minimize the impact of an incident.

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Answer:

It's A.

Explanation:

A positive charge is called a proton, a neutral charge is a neutron, and a negative charge is an electron.

Don't worry this does get confusing, I hope this helps.

Answer:

A

Explanation:

the question just asked to put protons first, neutrons next, electrons last in a sentence. All the other options mixed up the order they asked for.

Answer:

theres no picture

Explanation:

The Law of Conservation of Mass given by Antoine Lavoisier states that mass is neither created nor destroyed. So, if 2 gm of product are produced, then mass of reactants consumed is also 2 grams.

What is law of conservation of mass ?

According to the rule of conservation of mass, mass is neither generated nor destroyed during a chemical process. For instance, when coal is burned, the carbon atom in it transforms into carbon dioxide. The carbon atom transforms from a solid to a gas, yet its mass remains constant.

Law of Conservation of Mass: Its Importance in Chemistry. Understanding and producing different chemical reactions depend heavily on this law. Researchers might anticipate how much the result would be if they knew the identities and quantities of the reactants for each reaction.

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3.2 g CaCO₃

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

1.9 × 10²² molecules CaCO₃

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of Ca - 40.08 g/mol

[PT] Molar Mass of C - 12.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of CaCO₃ - 40.08 + 12.01 + 3(16.00) = 100.09 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

3.15794 g CaCO₃ ≈ 3.2 g CaCO₃

Answer:Metals are left of the Metalloid stair case and non metals are right

Explanation:

Pick any metal on the periodic table (left of the staircase). Aluminum, Calcium, Lead, anything but Hydrogen.

Non-metals are found on the right side of the staircase. Chorine, Iodine, Carbon, etc

**Keep in mind that not all solids are metalloids.

Answer:

\(1.29 * 10^{24}\) particles of gold

Explanation:

To convert the number of moles of any substance, in this case gold, you need Avogadro's number.

Avogadro's number is always \(6.022\) × \(10^{23}\)

\(2.15\) moles Au × \(\frac{6.022*10^{23} particles}{1 mole Au}\) = \(1.29 * 10^{24}\) particles of gold

The number of representative particles in 2.15 moles of gold is 1.29 × 10 ²⁴.

The term mole is defined as the amount of  substance containing 6.023 × 10²³ particles. 1 mol = 6.023 × 10²³ particles. This number is also called Avogadro's number. The symbol of mole is denoted by M.

A mole is a very important unit of measurement that chemists use. By using moles, chemists have to measure for very small things like atoms, molecules, or other particles.

The quantity amount of substance is a measure of how many elementary entities of a given substance are present in it.

To convert the number of moles of any substance, we required Avogadro's number.

Avogadro's number is always equal to 6.023 × 10 ²³

2.15 moles Au × 6.023 × 10 ²³ particles / 1 mole of Au

= 1.29 × 10 ²⁴ particles of gold

Thus, the number of representative particles in 2.15 moles of gold is 1.29 × 10 ²⁴.

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Answer: If a pinch of mercury is consumed you will die from it so using a mercury thermometer is very unsafe if its breaks and a child consumes that mercury.

Explanation:

Don't use one

If the glass breaks and the mercury is not properly cleaned up, the little silvery ball within a mercury thermometer might be hazardous. As the mercury evaporates, it may pollute the air around and turn dangerous to both people and animals.

Children that have been exposed to mercury have lower IQs, hearing impairments, and worse coordination.

Long-term exposure worsens and exacerbates symptoms, which may lead to personality changes or even coma.

Mercury thermometers can be replaced by a number of things:

These non-mercury fever thermometers are significantly safer and equally accurate as mercury thermometers.

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If 2 grams of water absorbs 20 calories of heat (assume not during a state change), the resulting water temperature change is - 272.975 °C .

Calculation ,

Formula used : Q = m × Cp × change in temperature

Q = m × Cp × ΔT           ( i )

Where Q is the heat supplied in calories = 20 cal ( given )

m is the mass of water in gram = 2 g  ( given )

Cp is the specific heat capacity of water  at constant pressure = 1 cal / gK ( known )

Thus , after putting the value of heat supplied in calories ,  mass of water and specific heat capacity of water in equation ( i ) we get the value of change in temperature .

1 cal / gK  = 2 g × 20 cal × ΔT

 ΔT = 1 cal / gK / 2 g × 20 cal = 0.025 K

  ΔT = 0.025 K - 273 = - 272.975 °C

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Answer:

5g NaOH

Explanation:

3D view of H3O+

The stronger line means that the Hydrogen is closer to us in a 3D view, meanwhile the line with traces, or you cal also see as a weaker line, it means that the Hydrogen is farther from us in a 3D view

Lewis Structure of H3O+

To determine the precise number of CO2 molecules formed in a reaction, it is necessary to consider the specific reactants involved and their stoichiometry in the reaction equation.

Each reaction has its own unique balanced equation, which provides the ratio of reactants and products. However, it is generally true that in combustion reactions involving hydrocarbons or carbon-containing compounds, a significant amount of CO2 is typically produced. This is because the complete combustion of these substances involves the oxidation of carbon atoms, resulting in the formation of CO2.

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Catenation, which describes the ability of carbon atoms to bond with each other, forming long chains or rings. Option C

The scientific term for the phenomenon where carbon atoms bond to themselves is catenation. Catenation refers to the ability of an element to form covalent bonds with atoms of the same element, resulting in the formation of long chains or rings.

Carbon is an exceptional element when it comes to catenation. It has four valence electrons, allowing it to form stable covalent bonds with other carbon atoms. Carbon can bond with itself in a variety of ways, creating a wide range of structures and compounds, including straight chains, branched chains, and cyclic structures.

This unique property of carbon is the foundation of organic chemistry, as it enables the formation of complex and diverse organic compounds. The ability of carbon to form stable covalent bonds with itself and other elements allows for the formation of molecules with diverse properties, making carbon the basis of life on Earth.

In contrast, ionic bonding refers to the electrostatic attraction between positively and negatively charged ions, where electrons are transferred from one atom to another to achieve a stable configuration. Self-bonding and octet fulfillment are not specific scientific terms related to the bonding of carbon atoms.

Option C is correct .

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Answer:

hi

Explanation:

Answer:

48,270,000 micrometers.

Explanation:

Multiply the length value by 10000.

Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

Answer:

The new volume is approximately 17.637 liters

Explanation:

The given parameters in the question are;

The initial volume of the gas, V₁ = 13.5 Liter

The initial temperature of the gas, T₁ = 248 K

The new temperature of the gas, T₂ = 324 K

A balloon containing gas that experiences an increase in the temperature of the gas content under constant pressure obeys Charles law which states that the volume of a given mass of gas is directly proportional to its Kelvin temperature is expressed mathematically as follows;

\(\dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}\)

Where;

V₁ = The initial volume of the gas

T₁ = The initial temperature of the gas

V₂ = The new volume of the gas

T₂ = The new temperature of the gas

From the question, we have;

V₁ = 13.5 Liter

T₁ = 248 K

T₂ = 324 K

Therefore, we have;

\({V_2}= \dfrac{V_1}{T_1} \times T_2\)

\({V_2}= \dfrac{324 \ K}{248 \ K} \times 13.5 \ L=17\dfrac{79}{124} \ L\approx 17.637 \ L\)

The new volume, V₂ ≈ 17.637 L.

Answer:

0.00726mol

Explanation:

Using general gas equation,

PV = nRT

Where;

P = pressure

V = volume

n = number of moles

R = gas constant (0.0821 L atm mol/K)

T = temperature

First, we need to convert the units of each variable

Volume = 185mL = 0.185L

Pressure = 760.0 torr = 1 atm

Temperature = 98.6°F = 310.15K

PV = nRT

1 × 0.185 = n × 0.0821 × 310.15

0.185 = 25.46n

n = 0.185/25.46

n = 0.00726mol

Answer:

The energy found in the reactants remains in the system, and the reactants also take energy from the surroundings.

Explanation:

In an endothermic reaction,the energy found in the reactants remains in the system, and the reactants also take energy from the surroundings. The enthalpy change of an endothermic reaction is positive.

The reaction in which  heat energy is absorbed by the reactants is called an endothermic reaction. The enthalpy change in an endothermic reaction is positive.

The reaction in which heat is evolved from the system to the  surroundings is called an exothermic reaction in which the enthalpy change is negative.

By absorbing heat energy, reactants becomes energetic enough to overcome the barrier potential of the reaction. Therefore, the potential energy diagram of an endothermic reaction will show less energy for reactants than that of products.

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A substance that is impenetrable by x-rays is described as being radiopaque.

Radiopaque substances will not allow x-rays and or other forms of radiations to pass through them.

Instead, they absorb or block the rays and when used in radiology, they appear white or light gray on photographic films.

Radiopaque materials are applied in generating ultrasound images and other forms of clinical procedures.

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