How many grams of oxygen are required to react with 24.4 g of lead(II) sulfide?
Express your answer using three significant figures.

The density of the solid block is 3.79 * 10⁻³ g/cm³.

The density of a substance is defined as the ratio of mass and volume of a substance.

Density measure how close together the particles of a given mass of a substance is. Substances with high density have greater masses compared to the volume of those substances whereas substances with low densities have greater volume compared to their masses.

The volume of the solid block = 78 * 55 * 35 = 150150 cm³

mass of solid block = 569 g

Density of the solid block = 569 g/150150 cm³

Density of the solid block = 3.79 * 10⁻³ g/cm³

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The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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The molar concentration of the salt is  0.600 M. Option B

We know that the term molar concentration has to do with the number of moles of the salt that is present in one liter of the solution. We have been given the mass of the salt that is formed, we need to obtain the number of moles of the salt that has been formed and use the volume of the solution that have been given in the question to find the molar concentration of the salt.

Mass of the salt = 8.24 g

Molar mass of the salt = 58.5 g/mol

Number of moles of the salt = mass/molar mass

=  8.24 g/ 58.5 g/mol

= 0.14 moles

Volume of the solution = 235.0 mL or 0.235 L

Molar concentration =  0.14 moles/ 0.235 L

= 0.595 M or  0.600 M

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Answer:

Fractional distillation

Explanation:

The most suitable separation technique for a miscible solution of ethanol and water is distillation. Distillation is a separation technique used to separate two or more liquids with different boiling points by heating the mixture and then condensing the vapors that are produced.

In the case of a solution of ethanol and water, the boiling point of ethanol is lower than that of water, so when the solution is heated, the ethanol will vaporize first. The vapors are then condensed back into a liquid, which can be collected separately from the water.

There are two types of distillation: simple distillation and fractional distillation. Simple distillation is used when the liquids to be separated have a large difference in boiling points, while fractional distillation is used when the difference in boiling points is smaller. In the case of a solution of ethanol and water, fractional distillation is typically used since the difference in boiling points between the two liquids is not very large.

During fractional distillation, the mixture is heated and the vapors are allowed to rise up a column that contains a series of plates or packing material. As the vapors rise, they gradually cool and condense, and the components with lower boiling points (in this case, ethanol) condense at the top of the column, while the components with higher boiling points (water) condense lower down. The condensed liquids are then collected separately at different points in the column.

Answer:Osmotic pressure is the minimum amount of pressure a solution must exert in order to prevent from crossing a barrier by osmosis. Solute molecules have difficulty crossing semipermeable membranes, so the more solutes that are in a solution, the higher the osmotic pressure will be. Between 30% sucrose and 60% sucrose, 60% sucrose will have a greater osmotic pressure than 30% because it has a higher percentage of solutes. However, since sucrose has a higher potential to cross semipermeable membranes and is more absorbable than magnesium sulfate, magnesium sulfate would have a higher osmotic pressure than 60% sucrose even though 60% sucrose has higher molecules.

Explanation:

Basically, carbon (C2) burns in the presence of adequate Oxygen (O2) to form carbon dioxide. Carbon is Quadro valent and is able to accept four more electrons. Oxygen has two electrons and hence, readily reacts with carbon to help break and make bonds. The chemical equation of carbon dioxide (CO2) is

carbon + oxygen → carbon dioxide or C2 + O2 = CO2

Answer:

C

Explanation:

Because it is the question that represents than carbon in the presence of oxygen give carbon dioxide.

Answer:

Explanation:

1 mol of sodium = 23 grams (use the number on your periodic table).

0.7350 mol sodium = x

Cross multiply

1*x = 0.7350 * 23

x = 16.905

You will get slightly less than this, depending on your periodic table. But the method will be the same.

Effective nuclear charge decreases down a group and increases from left to the right across a period.

Effective nuclear charge decreases down a group because as you go down a group, there are more shells of electrons. This means that the distance between the nucleus and the outermost electron orbital increases; thus the attraction of the valence electrons to the nucleus decreases down a group.

Effective nuclear charge increases from left to right across a period because although electron shielding remains constant, the number of protons in the nucleus remains constant. This means that the nucleus has a greater positive charge, and thus there is a greater attraction between the electrons in the electron cloud and the nucleus (since opposite charges attract).

Answer:

The chemical compound Mg(NO3)2, also known as magnesium nitrate, is very soluble, especially in water.

The pH of the solution of the weak base here is 11.28.

We know that in this case, we have a weak base and we have been asked to obtain the pH of the solution. Let us note that the dissociation of the base would produce the hydroxide ion.

As such we have;

Ka = x^2/0.43 - x

x = concentration of the hydroxide ion

Then;

8.1 * 10^-6 = x^2/0.43 - x

8.1 * 10^-6(0.43 - x) = x^2

3.5 * 10^-6 - 8.1 * 10^-6x = x^2

x^2 +  8.1 * 10^-6x - 3.5 * 10^-6  = 0

x = 0.0019 M

pOH = -log( 0.0019)

= 2.72

pH = 14 - 2.72

= 11.28

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Answer:

\(\% w/w=33.1\%\)

Explanation:

Hello,

In this case, since the solution is formed by sodium chloride and water, we understand that for one mole of solution, we have 0.132 moles of sodium chloride and 0.868 moles of water, therefore, by using their molar masses we can compute their masses in the solution:

\(m_{NaCl}=0.132molNaCl*\frac{58.44gNaCl}{1molNaCl}=7.714gNaCl\\ \\m_{H_2O}=0.868molH_2O*\frac{18gH_2O}{1molH_2O}=15.624gH_2O\)

Thereby, we can compute the weight/weight percent as follows:

\(\% w/w=\frac{m_{NaCl}}{m_{H_2O}+m_{NaCl}}*100\%\)

So we use the previously computed masses:

\(\% w/w=\frac{7.714g}{7.714g+15.624g}*100\% \\\\\% w/w=33.1\%\)

Best regards.

Answer: 33.1

Explanation:

Answer:

SI-28

Explanation:

Velocity is a vector quantity that describes the rate and direction of an object's motion.

a) The velocity of the fluid:

V = 35 gpm / (π * (1.05 in)^2 / 4) = 7.09 ft/s

b) Reynolds number:

Re = (62.3 lbm/ft^3 * 7.09 ft/s * 1.05 in) / (1.2 cP) = 4,211.9

[2]- a) Expression to find pressure of methane gas at point B:

PB = PA + rgh

b) Pressure of methane gas at point B:

PB = 1,000 psig + (0.072 lbm/ft^3 * 32.2 ft * 0.0689 psia/ft) = 1,233.5 psig

c) Pressure of oil at point C:

PC = PB - 0.433 psia/ft * 32.2 ft = 1,093.3 psig

[3]- Expression to find pressure of inlet water Pw needed to displace oil:

Pw = PC + (σ / r) * (h2 - h1)

Pw = 1,093.3 psig + (σ / 0.072 lbm/ft^3) * (32.2 ft - 0 ft) = 1,093.3 psig + (σ / 0.072 lbm/ft^3) * 32.2 ft.

What is velocity?

Velocity is a vector quantity that describes the rate and direction of an object's motion. It is commonly represented by the symbol 'v' and is measured in meters per second (m/s). Velocity includes both the speed and the direction of the object. For example, if an object is moving north at 10 m/s, its velocity would be 10 m/s north. Velocity can also be determined by taking the derivative of the position function with respect to time.

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Answer:

~ 3.5 x 10^21

Explanation:

Mole weight of Ca Cl2   ( from periodic table ) = ~~ 111 gm

.645 gm / 111 gm / mole   X  6.022 x 10^23  =

Hg + O2 → HgO

✅Word equation: Mercury + Oxygen gas → Mercury (II) oxide

✅ Type of Chemical Reaction: For this reaction we have a combination reaction.

✅ Balancing Strategies: To balance this equation it's probably easiest to begin by changing the coefficient in front of the HgO.

This is a combination reactions because the mercury (Hg) plus the oxygen gas (O2) come together to form the Mercury (II) oxide (MgO).

Hint-1

Hint-2

IamSugarBee

Answer:

the answer is a

Explanation:

The findings of scientific investigation can be seen in four real-world situations:

Finding the answer to a topic through a variety of research techniques is the process of conducting a scientific investigation.

Thus, the findings of scientific investigation can be seen in four real-world situations:

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Answer:

a chemical change

Explanation:

lighting a match is a chemical change. chemical reactions cause chemical change. in a chemical reaction two or more substances, called the reactants, form different substances called products. hope this helped :)

For consumption of each gram of reactant released=37.9 kJ/g

Therefore, for consumption of 4kg of reactant heat released=37.9x4 kJ/g

Answer:

Filter it

Explanation:

Answer:

Np-237, Ar-40.

Explanation:

Alpha particle is positively charged particle having a mass of 4 unit. Hence,when alpha is  removed from any isotope it produces a element having  mass 4 units less than original isotope that was before emission. Americium 241 isotopes used in the smoke detector which emit an alpha particle to produce neptunium-237.

Potassium-40 emits positron which is having negative charge to lower one proton and increase one neutron number in the particle and in such way it will produce \(^{40}Ar_{18}\) not  \(^{40}Ca_{20}\)

Answer:

Neptunium - 237 , Argon - 40 .

Explanation:

Americium - 241   ⇒    Neptunium - 237 + alpha particles

²⁴¹₉₅Am    ⇒     ²³⁷₉₃Np  + ⁴₂α

K-40   ⇒  Argon 40 + positron .

⁴⁰₁₉K    ⇒   ⁴⁰₂₀Ar   +   ₁e

Millions of metal atoms crowding together so that molecular orbitals become combined will result in the formation of bands in a crystal.

When the atomic orbitals on the atoms of a molecule combine together they result in the formation of molecular orbitals. Molecular orbitals are of two types, bonding molecular orbitals and antibonding molecular orbitals. The number of the molecular orbitals are found to be always equal to the number of atomic orbitals which combined.

When a crystal is formed by a number of metal atoms, there is a presence of a number of molecular orbitals. When a number of atoms are placed close to one another, the structures of their energy levels transform to form bands on the metallic crystal.

Hence, when metals atoms get collected together for the combining of molecular orbitals, formation of bands in a crystal is observed.

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Answer: its B the formation of bands in a crystal

Explanation: i did the test and this is the answer trust

Anwser:

Research scientific principles involved in water availability.

Explanation:

Before building or investment you always want to see and know what your up against and what the best way to help or solve is. Researching why there's a problem in water availability or/and the principals to water availability will help you see what the problem is with what's happening to and around the process and it's environment.

The major product from the above organic reaction is I

In this reaction, methoxy ethane undergoes addition reaction with hydrogen bromide, Markownikoff's rule being involved in the reaction.

Organic compounds are the compounds which contains carbon and hydrogen.

Generally, organic compounds are characterized by the following:

Below are some classes of organic compounds:

So therefore, the major product from the the above organic reaction is IV

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Answer:

The percent mass of HCl in the solution is 3.48  %

The percent mass of ethanol in the solution is 6.01  %

The molarity of silver nitrate in the solution is 3.46 M

Explanation:

Density always referrs to solution data.

1.02 g/mL = 100 g / volume of solution

Volume of solution = 98.04 mL

Molarity = moles of solute in 1L of solution (or mmoles of solute in 1mL)

M . 98.04 mL = mmoles of solute → 0.975 M . 98.04 mL = 95.59 mmoles

mmoles . PM (mg / mmol) = mg → 95.59 mmol . 36.45 mg/mmol = 3484 mg.

We convert data to g → 3484 mg . 1g/ 1000 mg = 3.48 g

The percent mass of HCl in the solution is 3.48  %

Density always referrs to solution data.

0.988 g/mL = 100 g / volume of solution

Volume of solution = 101.21 mL

Molarity = moles of solute in 1L of solution (or mmoles of solute in 1mL)

M . 101.21 mL = mmoles of solute → 1.29 M . 101.21 mL = 130.6 mmoles

mmoles . PM (mg / mmol) = mg → 130.6 mmol . 46.07 mg/mmol = 6015 mg.

We convert data to g → 6015 mg . 1g/ 1000 mg = 6.01 g

The percent mass of ethanol in the solution is 6.01  %

Density always referrs to solution data.

1.47 g/mL = 100 g / volume of solution

Volume of solution = 68.03 mL

Molarity = moles of solute in 1L of solution (or mmoles of solute in 1mL)

40 g = 40000 mg

mg / PM (mg / mmol) = mmol → 40000 mg / 169.87 mg/mmol

= 235.4 mmoles

mmoles / mL = Molarity  → 235.4 mmol / 68.03 mL = 3.46 M

Answer:

D

Explanation:

it's D because it goes waxing crescent to waxing gibbous

The wording of this question is a little weird, however, based on enthalpy and gases, converting from gases to liquids uses MORE energy than it uses to go from a gas to another gas. Depending on your state of matter, the amount of energy needed changes.

Answer:

She will have an active imagination.

Explanation:

I took the test and i got 90%

But this one is right, hope this helps ( :

Answer:

a

Explanation:

give the person above me brainlest :)