A 170.00-g sample of an unidentified compound contains 29.84 g sodium, 67.49 g chromium, and 72.67 g oxygen. What is the empirical formula of this compound

Set e) 1, 1, 0, 1/2 is not a valid set of quantum numbers.

To reiterate the rules for the quantum number values:

1) The principal quantum number (n) can be any integer greater than 0. All given sets meet this prerequisite.

2) For a given value of n, the angular momentum quantum number (l) can have any integer value from 0 to n-1. Set e) does not meet this criterium, because, for n = 1, l can only have a value of 0 (1 - 1 = 0).

3) For a given value of l, the magnetic quantum number (ml) can have integer values from -l to l. All given sets meet this prerequisite.

4) Spin quantum number (ms) can be either +1/2 or -1/2. All given sets meet this prerequisite.  

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The mass of salt in the tank after t minutes can be determined using the formula: Mass of salt = concentration of salt × volume of solution.

To find the mass of salt in the tank after t minutes, we need to multiply the concentration of salt by the volume of the solution. The concentration of salt is given as 0.03 kg/L, and the volume of the solution is given as kg. Therefore, the mass of salt can be calculated by multiplying 0.03 kg/L by kg.

The concentration of salt in the tank will reach 0.03 kg/L after minutes. This means that at this time, the amount of salt in the tank will be such that if it is divided by the volume of the solution, it will equal 0.03 kg/L. To calculate the time it takes for the concentration of salt to reach 0.03 kg/L, we need to divide the mass of salt by the volume of the solution and then multiply it by 1/L. This will give us the time in minutes.

In the second part of the question, a cold drink initially at 35°F warms up to 38°F in 3 minutes while sitting in a room of temperature 72°F. To find how warm the drink will be if left out for 30 minutes, we need to consider the rate at which the drink warms up and the time it is left out.

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Answer:

4 moles of H₃PO₄

Explanation:

The reaction expression is given as;

     3KOH   + H₃PO₄   →   K₃PO₄   +  3H₂O

Number of moles of water  =  12moles

Unknown:

Number of moles of H₃PO₄ = ?

Solution:

 From the balanced reaction expression we see that;

          3 moles of water is produced from 1 mole of H₃PO₄

So;    12 moles of water would be produced from \(\frac{12}{3}\) = 4 moles of H₃PO₄

Answer:4 moles of H₃PO₄

Explanation: did the test homie

Answer:

60 dollars!

Explanation:

So, 12 oranges cost $36 dollars.

Now, we can solve this by finding the value for only one orange, then multiplying that by 20 to get our answer!

So, the value of one orange is $36 / 12 = $3. One orange is worth $3 dollars.

So, 20 oranges will be worth 20 * 3 = $60 dollars!

if  a person with blood alcohol concentration of 0.03% has the blood plasma volume is 3.0 . It contains 9ml of alcohol.

To determine the amount of alcohol represented by a blood alcohol concentration of 0.03% (v/v), we can use the following formula:

amount of alcohol (mL) = (blood alcohol concentration) x (blood plasma volume)

Plugging in the given values, we get:

amount of alcohol (mL) = (0.03%) x (3.0 L)

Since 1 L = 1000 mL, we can convert the blood plasma volume to milliliters:

amount of alcohol (mL) = (0.03%) x (3000 mL)

Finally, we can multiply the two quantities to get the amount of alcohol in milliliters:

amount of alcohol (mL) = 0.03% x 3000 mL = 9 mL

So, a blood alcohol concentration of 0.03% (v/v) in a person with a blood plasma volume of 3.0 L represents 9 mL of alcohol.

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Within any kind of chemical reaction the purpose of mechanism is to make the reaction happen and various factor affect the reaction.

In any kind of chemical reaction there are two substituents required, firstly is the molecule that is said to participate in any kind of reaction which is aid to be the reactant and secondly is the result generated from the reaction which is said to be the product.

The mechanism may involve various kinds of factors which include the formation of any kind of bond and also the bond-breakage. It also include various kinds of steps so as to generate the end-result.

The main role of the lone-pairs in any kind of reaction is that they are assigned the role of serving any kind of reaction in two kinds. Firstly is the electron(e) acceptor and secondly is the electron(e) donor. The main role of the term stereochemistry is the following order of various kinds of atoms that play an essential role in chemical reactions.

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The complete question is

What do you understand by the mechanism that takes part in any chemical reaction. Also explain about the role of lone pair and stereochemistry in the chemical reaction?

Answer: 3.156 * 10^7

Explanation: I do not really understand your question. You answered it yourself!

Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.

You did everything correctly :) Good job!

the answer is:

40 g/mole

Somebody claims to have developed a new reversible heat-engine cycle that has a higher theoretical efficiency than the Carnot cycle operating between the same temperature limits. This evaluates that this heat engine is less efficient.

The Carnot's cycle is an ideal cycle for all heat engine which operates between the same temperature. It is a reversible cycle which have all process reversible that is why it have maximum efficiency.

On the other hand, the new reversible heat engine is a practical working cycle so it is impossible to make all process reversible . Practically,  there will be always loss of energy due to this any process can not be 100 % reversible. That is why the new reversible heat-engine cycle have low efficiency as compared to Carnot cycle operating between same temperature limits.

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Answer:

Static Electricity

Explanation:

Answer:

static electricity

Explanation:

The correct options are:1.

Conditional probability that the selected compound actually has an impurity is 0.74.2.

Conditional probability that the selected compound is actually free of an impurity is 0.0185.3.

Conditional probability that the selected roll is from Process I given that it is defective is 0.64.

Here, we need to find out the probability that a selected compound has an impurity given that the test indicates an impurity is present.

P(A) = probability that a compound has impurity = 0.15

P(B) = probability that the test indicates an impurity is present

= 0.15 x 0.9 + 0.85 x 0.05

= 0.14 + 0.0425

= 0.1825P

(B|A) = probability that the test indicates an impurity is present given that the compound has impurity = 0.9

Therefore, by Bayes' Theorem,

P(A|B) = P(B|A) * P(A) / P(B)

         = 0.9 * 0.15 / 0.1825

         = 0.7370

         ≈ 0.74

Conditional probability that the selected compound actually has an impurity is 0.74.10.

Here, we need to find out the probability that a selected compound is actually free of an impurity given that the test indicates an impurity is not present.

P(A) = probability that a compound has impurity = 0.15

P(B) = probability that the test indicates an impurity is not present = 0.85 x 0.95 + 0.15 x 0.1 = 0.8075

P(B|A) = probability that the test indicates an impurity is not present given that the compound has impurity

          = 0.1

Therefore, by Bayes' Theorem,

P(A|B) = P(B|A) * P(A) / P(B)

          = 0.1 * 0.15 / 0.8075

          = 0.0185

Conditional probability that the selected compound is actually free of an impurity is 0.0185.11.

Here, we need to find out the probability that the selected roll is from Process I given that it is defective.

Let A denote the event that a roll is from Process I and B denote the event that a roll is defective.

Then, we need to find out P(A|B).

P(A) = probability that a roll is from Process I = 0.6

P(B|A) = probability that a roll is defective given that it is from Process I = 0.03

P(B|A') = probability that a roll is defective given that it is from Process II = 0.01

P(A'|B) = probability that a roll is from Process II given that it is defective

Therefore, by Bayes' Theorem,

P(A|B) = P(B|A) * P(A) / [P(B|A) * P(A) + P(B|A') * P(A')]

= 0.03 * 0.6 / (0.03 * 0.6 + 0.01 * 0.4)

= 0.6429

≈ 0.64

Conditional probability that the selected roll is from Process I given that it is defective is 0.64.

Hence, the correct options are:1.

Conditional probability that the selected compound actually has an impurity is 0.74.2.

Conditional probability that the selected compound is actually free of an impurity is 0.0185.3.

Conditional probability that the selected roll is from Process I given that it is defective is 0.64.

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COFC and TOFC are both terms used in the freight forwarding industry, but they refer to different types of transportation methods.The main difference between COFC and TOFC lies in the type of cargo being transported. COFC involves loading containers onto flat railcars, while TOFC involves loading entire trailers.  

Here is a detailed explanation of the difference between COFC and TOFC:

1. Definition:
- COFC: COFC stands for Container on Flat Car. It refers to a transportation method where containers are loaded directly onto flat railcars. These containers are typically standardized and can be easily transferred between different modes of transportation, such as trucks, ships, and trains.
- TOFC: TOFC stands for Trailer on Flat Car. It involves loading entire trailers onto flat railcars. Unlike COFC, where only the containers are transferred, TOFC includes the entire trailer, including the cargo inside it.

2. Loading Process:
- COFC: In COFC, containers are typically loaded onto flat railcars using cranes or other lifting equipment. The containers are securely placed on the flatcar and can be easily secured to prevent movement during transportation.
- TOFC: In TOFC, trailers are loaded onto flat railcars using ramps or other loading equipment. The trailers are driven onto the flatcar and securely attached to prevent movement.

3. Benefits and Limitations:
- COFC: COFC offers several benefits, including efficient intermodal transportation, reduced handling of cargo, and increased security of cargo. However, it has a limitation that it requires specialized containers to be used.
- TOFC: TOFC also offers efficient intermodal transportation and reduced cargo handling. However, it provides the advantage of being able to transport a wider range of cargo, including oversized or irregularly shaped items. One limitation is that it requires specialized flat railcars to accommodate the trailers.

In conclusion, the main difference between COFC and TOFC lies in the type of cargo being transported. COFC involves loading containers onto flat railcars, while TOFC involves loading entire trailers. Both methods offer efficient intermodal transportation, but COFC requires specialized containers, while TOFC can accommodate a wider range of cargo.

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Step 1

The reaction must be completed and balanced as follows:

C3H8 + 5 O2 => 3 CO2 + 4 H2O

-------------

Step 2

Information provided:

20.0 g of C3H8

10.0 g of O2

----

Information needed:

1 mole of C3H8 = 44.1 g

1 mole of O2 = 32.0 g

(use your periodic table please)

-------------

Step 3

By stoichiometry,

C3H8 + 5 O2 => 3 CO2 + 4 H2O

44.1 g C3H8 ---------- 5 x 32.0 g O2

20.0 g C3H8 ---------- X

X = 20.0 g C3H8 x 5 x 32.0 g O2/44.1 g C3H8

X = 72.6 g O2

For 20.0 g of C3H8, 72.6 g of O2 is needed, but there is only 10.0 g of O2.

Therefore,

Answer:

The limiting reactant = O2

The excess = C3H8

Answer: The rate constant is the reaction rate divided by the concentration terms.

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer:

0.31 atm

Explanation:

According to the Dalton's law of partial pressure, the total pressure of the gaseous mixture is equal to the sum of the pressure of the individual gases.

Also, the partial pressure of the gas is equal to the product of the mole fraction and total pressure.

Given, for hydrogen gas, it is 25% of the total moles.

So, Mole fraction = 0.25

Total pressure = 1.24 atm

Partial pressure of hydrogen = 0.25 * 1.24 atm = 0.31 atm

Answer:

a. 0.31 atm

Explanation:

got it right on edge

Explanation:

Step 1: Write out the chemical formula of the compound.

Magnesium Chloride = MgCl^2

Step 2: Convert moles into number of compounds using Avogadro's number

0.5 moles MgCl^2 ⋅(6.022⋅10^23 - 1 mole MgCl^2)= 3.011⋅ 10^23

Step 3: Determine how many Chloride ions there will be in 1 compound

There will be 2 Cl− ions in each compound (Cl^2 part)

Step 4: Multiply the number from Step 2 by the number in Step 3

3.011 ⋅ 10^23 ⋅ 2= 6.022 ⋅ 10^23

We do this because the ratio is 2 Cl− ions for every 1 compound.

In the case of finding how many ions in general (both sodium and chloride), we would multiply by 3 because there are 3 ions per 1 compound.

I hope this helped!

1 mole of NaCl = 2 moles of ions, so 0.5 moles of NaCl contain 1 mole of ions.

Sodium chloride (NaCl) dissociates into sodium ions (Na⁺) and chloride ions (Cl⁻) in a 1:1 ratio. This means that for every mole of NaCl, you get one mole of sodium ions and one mole of chloride ions.

Therefore, 0.5 moles of NaCl will yield 0.5 moles of sodium ions and 0.5 moles of chloride ions. Since you asked about the total number of ions, you need to add the number of sodium ions and chloride ions together. As a result, 0.5 moles of NaCl will contain a total of 1 mole of ions.

The key factor here is the balanced stoichiometry of the dissociation reaction, which gives a 1:1 ratio of ions for NaCl.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass = 112 g

density of mercury = 13.6 g/mL

We have

\(volume = \frac{112}{13.6} \\ = 8.23529411...\)

We have the final answer as

Hope this helps you

Answer:

I think the answer is B

Explanation:

The formula for a compound made from x2 and y- can be predicted using the crisscross method.

X2 has a charge of 2+ while y- has a charge of 1-. To form a neutral compound, the charges must balance each other.

To do this, the charge of x2 will become the subscript of y, and the charge of y- will become the subscript of x2.

Thus, the formula for the compound will be written as X2Y.

This indicates that two atoms of x combine with one atom of y to form the compound.

The compound may have different properties and characteristics depending on the identity of the elements X and Y.

Overall, the crisscross method is an effective way to predict the formula of an ionic compound.

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Answer:

Explanation:

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

Air would be the most likely candidate for the can with the greatest change in temperature

Recall that the change in the heat capacity would be related to the heat capacity.

Since it has a relatively low specific heat capacity compared to the other options listed (iron filings, water, and sand). However, it's important to note that this is a simplified explanation and there may be other factors at play depending on the specific conditions of the experiment.

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Answer:

Compound

Explanation:

Compounds consists of atoms of two or more different elements that are chemically bonded together.

Answer:

Question stealer :]]

Explanation:

The empirical formula of the unknown compound is C2H4O

Number of moles = mass / molar mass

------

molar mass of CO2 = 44 g/ mole

Moles of CO2 =6.99/44 = 0.152 moles

Since there is 1 mole of C in CO2  

so, no. of moles of C = 0.152moles

mass of C = 0.152x 12 = 1.824  g

-------

molar mass of H2O = 18 g/ mole

moles of H2O =2.86/18 = 0.158moles

Since there are 2 moles of H in H2O

so, no. of moles of H = 0.158x2 = 0.317  moles

mass of H = 0.317x1.0079 = 0.3202g

--------

Total mass of H and C = 0.3202+1.824   = 2.144g

mass of sample =  3.50 g

mass of O =  3.50 - 2.144= 1.356 g

moles of O=1.356/16= 0.08475 moles

molar ratio of C : H : O =1.824  : 0.3202 : 0.08475

smallest number  = 0.0847

Divide number of moles of C,H and O by the smallest number:

Molar ratio of C : H : O = 21.53 : 3.9 : 1.0

                                        = 2:4:1

Hence the Empirical formula is C2H4O

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Answer:

A. increased competition for resources

Explanation:

A thermometer bulb is built of thin glass so that it can effectively conduct heat from an object that comes into contact with the mercury in the bulb.

With the chemical symbol Hg and the atomic number 80, mercury is a class of elements. It was once called hydrargyrum, which is a combination of the Greek terms Hydor and Argyros, and it is also known as quicksilver. Mercury is toxic in its entirety. While some mercury compounds are more hazardous than others, all of them are harmful. Mercury exposures can harm the immune system, kidneys, liver, nervous system, and more depending on the type and quantity. The lungs, kidneys, and nervous system can all suffer damage from inhaling mercury fumes.

Mercury is utilized in pressure measuring devices even though a wide variety of liquids may be used due to its high density and reduced space requirement. The fact that PTFE is a good conductor of electricity makes it a valuable addition to electrical switches.

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Answer:

the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber

The buoyancy of the magma is the main factor that controls the type of volcano that forms following eruption.

A volcano is a crack in the crust of the Earth, another planet, or a satellite from which molten rock, hot stone pieces, and hot gases are released in eruptions. An amazing demonstration of Earth's might is a volcanic eruption.

Eruptions may cause catastrophic loss of lives and property, particularly in areas of the planet that are highly inhabited, despite the fact that they are beautiful to observe. The buoyancy of the magma is the main factor that controls the type of volcano that forms following eruption.

Therefore,  the buoyancy of the magma is the main factor that controls the type of volcano that forms following eruption.

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