- What mass of NaoH required to make 500 ml of 3M solution?​

The molarity of the ammonium nitrate solution is 2281 M.

Molarity is defined as the number of moles of solute per liter of solution. It is also known as molar concentration of the solution and is used to calculate amount of substances in the solution.

Molarity = n/M

n = m / MW

m = 2 lbs = 1000/2.2 = 909 g

V = 53 x 3.79/1 = 200.9

MW = 80.04 g

M = m/Mw / V

M = 909/80.04 /200.9

M = 2281 M

Thus, the molarity of the ammonium nitrate solution is 2281 M.

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Answer:

Polythene bags are so lightweight and aerodynamic, they are easily picked up and carried by the wind. They can escape from trash bins, recycle bins, garbage trucks, and landfills, and end up littering the landscape.

hope it helps

Explanation:

Answer:

A or 3 would be the right answer

Answer:

The correct option is a

Explanation:

First ionization energy is the minimum amount of energy required to remove the most loosely bound electron (valence electron) from the outermost shell of a gaseous or neutral atom. Since it takes more amount of energy to remove more electrons, it (ionization energy) generally increases across the period and decreases down a group because the closer the outermost shell is to the nucleus, the more difficult/energy required to remove electrons in that shell.

Since magnesium and phosphorus are on the same period (period 3), it can be deduced from the explanation above that phosphorus has a greater first ionization energy than magnesium because phosphorus (5 valence electrons) has more electrons in it's outermost shell than magnesium (2 valence electrons).

Option D - They are negatively charged and located outside the nucleus is the correct alternative.

We have electrons.

We have to determine which of the given statements are true about electrons.

An electron is a negatively charged subatomic particle that can be either bound to an atom or free (not bound).

According to the question -

The role of electrons inside the atom is as follows -

Hence, Option D is the correct alternative.

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Answer:

Hope this helps ;) don't forget to rate this answer !

Explanation:

To find the number of moles of Cr(NO3)3 in the sample, we need to determine the number of moles of each element present in the compound.

The chemical formula for Cr(NO3)3 tells us that for every 1 mole of Cr(NO3)3, there is 1 mole of chromium (Cr), 3 moles of nitrogen (N), and 9 moles of oxygen (O).

We are given that the sample contains 8.36 moles of oxygen. Since the ratio of oxygen to Cr(NO3)3 is 9:1, the number of moles of Cr(NO3)3 in the sample is 8.36 moles O / 9 moles O/mole Cr(NO3)3 = 0.93 moles Cr(NO3)3.

Rounded to 3 significant figures, the answer is 0.93 moles Cr(NO3)3.

Physics is a vast field that addresses a wide range of questions about the nature of the physical world. Probing questions can help to explore this field and encourage critical thinking and deep exploration of its topics.

Probing questions are open-ended questions asked to gather information, encourage critical thinking and deep exploration of a particular topic. Physics is a natural science that studies matter and its motion through space-time. It is a branch of science that deals with the fundamental nature of the universe and seeks to explain how and why objects behave as they do in the physical world.The following are some examples of probing questions within the scope of physics:What is the nature of light-The nature of light is an important topic within the scope of physics. It refers to the dual nature of light, as both a wave and a particle. Light behaves as a wave when it is traveling through space and as a particle when it is interacting with matter.How do magnets work-Magnets are a common object in the world around us, and they have a broad range of applications. They work by producing a magnetic field, which can attract or repel other magnetic objects. This topic lies within the scope of physics.What is the relationship between energy and matter-Energy and matter are two fundamental concepts in physics. The relationship between them is described by Einstein's famous equation E=mc2, which states that matter and energy are two forms of the same thing and are interchangeable. The study of the relationship between energy and matter lies within the scope of physics.What is the nature of the universe?The study of the universe's nature is one of the most significant topics within the scope of physics. This question addresses the origins and properties of the universe, its components, and the laws that govern its behavior.

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Answer:

This question appear incomplete

Explanation:

This question appear incomplete because an equation to show the production of sodium chloride from calcium chloride should have been illustrated. However, if the balanced chemical equation showing sodium chloride (NaCl) been a product of a reaction involving calcium chloride (CaCl₂) as a reactant (shown below) is to be used, then we start by writing a complete balanced chemical equation

CaCl₂ + Na₂CO₃  ⇒   CaCO₃ + 2NaCl

From the equation above, it can be deduced that 1 mole of CaCl₂ is required to produce 2 moles of NaCl, thus how many moles of CaCl₂ will be required to produce 6.5 moles of NaCl.

1 mole of CaCl₂ = 2 moles of NaCl

? moles of CaCl₂ = 6.5 moles of NaCl

cross multiply

? moles of CaCl₂ = 6.5 × 1/2

? moles of CaCl₂ = 3.25 moles of CaCl₂

3.25 moles of CaCl₂ will be needed to produce 6.5 moles of NaCl

The balanced equation for the reaction is:

HCN (aq) + NaOH (aq) → NaCN (aq) + H2O (l)

First, we need to find the volume of NaOH solution needed to reach equivalence:

0.7066 M HCN × 0.2100 L = x M NaOH × 0.2100 L

x = 0.3366 M NaOH

The volume of NaOH solution needed to reach equivalence is:

0.3366 M NaOH × VNaOH = 0.4210 M NaOH × 0.2100 L

VNaOH = 0.527 L = 527 mL

So, the total volume of the solution at equivalence is:

210.0 mL + 527 mL = 737 mL = 0.737 L

Now we can use the Henderson-Hasselbalch equation to find the pH at equivalence:

pH = pKa + log([A-]/[HA])

At equivalence, [HCN] = [CN-], so:

pH = pKa + log(1) = pKa = 9.21

Therefore, the pH at equivalence is 9.21.

It is likely that the temperature of the steam is higher than the temperature of the water boiling in the kettle. The intense heat felt by Alka from the puff of steam supports this observation.

In general, the temperature of steam produced from boiling water is higher than the temperature of the water itself. When water boils, it undergoes a phase change from a liquid to a gas, forming steam.

During this phase change, the water absorbs heat energy from the heat source, such as a stove or electric kettle, and converts it into the latent heat of vaporization.

The boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at standard atmospheric pressure. At this temperature, the water molecules have enough energy to overcome the intermolecular forces and transition into the gaseous state.

However, steam is hotter than the boiling point of water because it contains additional heat energy in the form of latent heat. The heat energy absorbed during vaporization is stored as latent heat within the steam. As the steam gushes out of the spout of the kettle, it releases this latent heat energy, which can be felt as intense heat.

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Answer:

Georgia and minessota

Explanation:

they have no production

Mass of H3PO4 reacted is 34.3 g. So, 34.3 grams of phosphoric acid reacted.

3 NaHCO3(aq) + H3PO4(s) → Na3PO4(aq) + 3 H2O(l) + 3 CO2(g)

Now we can see that every 3 moles of NaHCO3 reacts with 1 mole of H3PO4 to give 3 moles of CO2.

The given amount of CO2 produced is 26.1 L at 273 K and 1.00 atm of pressure.

To find out the moles of CO2 produced, we can use the Ideal Gas Law,

PV = nRT

where P = 1 atm, V = 26.1 L, T = 273 K, and R = 0.0821 L atm mol^-1 K^-1.

Plugging in these values, we get

n = PV/RT= (1.00 atm) (26.1 L) / (0.0821 L atm mol^-1 K^-1) (273 K)= 1.05 moles CO2

Since every 3 moles of NaHCO3 reacts with 1 mole of H3PO4 to give 3 moles of CO2, 1.05 moles of CO2 will react with 1.05/3 = 0.35 moles of H3PO4.

Now we can use the molar mass of H3PO4 to find the mass of H3PO4 in grams that reacted.

The molar mass of H3PO4 is 98.0 g mol^-1.

Therefore, mass of H3PO4 = moles of H3PO4 × molar mass of H3PO4

= 0.35 mol × 98.0 g mol^-1

= 34.3 g

Therefore, 34.3 g of H3PO4 reacted.

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Answer: The molarity of each of the given solutions is:

(a) 1.38 M

(b) 0.94 M

(c) 1.182 M

Explanation:

Molarity is the number of moles of a substance present in liter of a solution.

And, moles is the mass of a substance divided by its molar mass.

(a) Moles of ethanol (molar mass = 46 g/mol) is as follows.

\(Moles = \frac{mass}{molar mass}\\= \frac{28.5 g}{46 g/mol}\\= 0.619 mol\)

Now, molarity of ethanol solution is as follows.

\(Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.619 mol}{4.50 \times 10^{2} \times 10^{-3}L}\\= 1.38 M\)

(b) Moles of sucrose (molar mass = 342.3 g/mol) is as follows.

\(Moles = \frac{mass}{molar mass}\\= \frac{21.6 g}{342.3 g/mol}\\= 0.063 mol\)

Now, molarity of sucrose solution is as follows.

\(Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.063 mol}{0.067 L} (1 mL = 0.001 L)\\= 0.94 M\)

(c) Moles of sodium chloride (molar mass = 58.44 g/mol) are as follows.

\(Moles = \frac{mass}{molar mass}\\= \frac{6.65 g}{58.44 g/mol}\\= 0.114 mol\)

Now, molarity of sodium chloride solution is as follows.

\(Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.114 mol}{0.0962 L}\\= 1.182 M\)

Thus, we can conclude that the molarity of each of the given solutions is:

(a) 1.38 M

(b) 0.94 M

(c) 1.182 M

The functional groups that can cause a compound to be named differently depending on its location on the molecule are carboxylic acids, amines, and aromatics.

Carboxylic acids can be named differently depending on whether they are located at the end of a chain or at a branch point, while amines and aromatics can be named differently depending on their substitution patterns.

Amines are organic compounds that contain the amine functional group, which consists of a nitrogen atom bonded to one, two, or three alkyl or aryl groups. Amines can be named differently depending on the number of alkyl or aryl groups attached to the nitrogen atom, as well as their position on the molecule.

Aromatics are organic compounds that contain an aromatic ring, which consists of a cyclic arrangement of six carbon atoms. Aromatics can be named differently depending on the substituents on the ring, as well as their position on the molecule.

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According to the mole concept, there are 1.316 moles of ethane in 7.93×10²³ molecules of ethane.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

Number of moles=number of molecules/Avogadro's number= 7.93×10²³/6.023×10²³=1.316

Thus,  there are 1.316 moles of ethane in 7.93×10²³ molecules of ethane.

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The formal Positive sign convention for, work done by the system and heat transfer into the system. The Negative sign convention for heat transfer out of the system and work done to the system.

Thermodynamics is a special branch of chemistry that deals with concepts of heat, temperature and work and interconversion of heat into other forms of energy. Sign convention for heat : Heat transfer into the system is positive and heat transfer from the system is negative. In other words, all heat exchanges that increase the energy of a system are positive and all heat exchanges that decrease the energy of a system are negative. Sign rule for work :

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Complete question:

Following the formal sign convention, please match the heat and work interactions with their appropriate signs:Positive or Negative

1) work done by the system

2) heat transfer into the system

3) heat transfer out of the system

4) work done to the system

The statement that is true of water's tensile strength is: it involves both cohesion and adhesion. Option A, B and C are correct.

Tensile strength refers to the ability of a liquid to resist being pulled apart. In the case of water, its tensile strength is due to both cohesion, the attraction between water molecules, and adhesion, the attraction between water and other surfaces.

Water's hydrogen bonding creates strong cohesive forces between water molecules, allowing them to stick together and resist being pulled apart. Meanwhile, water's adhesion allows it to stick to other surfaces, such as the walls of a narrow tube, which helps to pull water through plants.

Therefore, while both statements (a) and (b) are partially correct, statement (c) is the most accurate as it encompasses both cohesion and adhesion, which together contribute to water's tensile strength.

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The main product formed from the given reaction is perhydronapthalen-2-ol.

Perhydronaphthalen-2-ol is a cyclic alcohol with the molecular formula C10H18O. It is also known as 2-tetralol or 2-decalol. The compound is a colorless liquid with a mild, floral odor.

Perhydronaphthalen-2-ol is used in perfumery and as a fragrance ingredient in various products such as soaps, detergents, and cosmetics. It is also used as a solvent and as an intermediate in the synthesis of other organic compounds.

The compound is synthesized by the hydrogenation of naphthalene in the presence of a catalyst such as nickel or platinum. The reaction typically requires high pressure and temperature, and the yield of perhydronaphthalen-2-ol can be improved by using a solvent or co-catalyst such as quinoline.

The mechanism and the final product of the reaction are attached.

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Yes, that statement is generally correct. A scientific law is a statement that describes a phenomenon or pattern in nature, often expressed mathematically, without attempting to explain why it occurs. A scientific theory, on the other hand, is a well-substantiated explanation for a set of phenomena, based on empirical evidence and scientific reasoning.

A scientific law summarizes what happens in a particular situation, often in the form of an equation or formula, whereas a scientific theory attempts to explain why it happens.

For example, the law of gravity describes the attraction between masses, but it does not explain why this attraction occurs. In contrast, the theory of general relativity attempts to explain the underlying principles of gravity, including its effects on the curvature of space-time.

It's worth noting that both scientific laws and scientific theories are based on empirical evidence, but they serve different purposes in scientific inquiry. Laws describe what happens in a particular situation, while theories attempt to explain why it happens.

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Answer:

The resulting solution is basic.

Explanation:

The reaction that takes place is:

First we calculate the added moles of HNO₃ and KOH:

As there are more KOH moles than HNO₃, the resulting solution is basic.

The resulting solution is basic.

• It is known that KOH is a base and HNO3 is an acid, so when they mix they undergo a neutralization reaction.  

• The reaction between there will be,  

HNO3 + KOH ⇔ KNO3 + H2O

Based on the given information,

• The volume of HNO3 is 12.5 ml and the molarity is 0.280 M, and the volume of KOH is 5 ml and the molarity is 0.920 M.

Now 1 mole of HNO3 completely reacts with 1 mole of KOH,

The millimoles of HNO3 is,

\(= Molarity * Volume (in ml)\\= 0.280 * 12.5\\= 3.5 mmol\)

The millimoles of KOH is,

\(= Molarity * Volume (in ml)\\= 0.920 * 5.0\\= 4.6 mmol\)

Now it can be seen that 3.5 millimoles of HNO3 completely reacts with 3.5 millimoles of KOH. Now we are left with 4.6-3.5 = 1.1 mmol of KOH.

Thus, KOH is in excess amount present in the solution, and as it is basic in nature, therefore, the resultant solution would be basic in nature.

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Answer:

Atomic Number

Explanation:

The number of protons an atom has is unique to that element. The number of protons is noted as the atomic number for that element on the periodic table.

Explanation:

if they aren't in a solvent, then you magnetize first, to remove the iron fillings, secondly, you can sieve to separate the sand and pebbles

Separate the pebbles by either straining them out or pulling each one out separately with tweezers or your fingertips.

To separate their soil mixes using the tools you have supplied, ask the groups to develop a plan. They might consider using forceps to separate the soil, shaking it between two tumblers, placing it in a water-filled tumbler, or pouring it through air. Invite student groups to present their ideas.

Pbbles  - Separate the pebbles by either straining them out or pulling each one out separately with tweezers or your fingertips. As a strainer, a colander or a section of window screen works well. Iron fillings Using a magnet, it is simple to remove the tiny iron filings from the mixture.

Therefore, separate the pebbles by either straining them out or pulling each one out separately with tweezers or your fingertips.

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The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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The mass of the ethanol used is 427.8 g

We know that combustion has to do   with the process by which we burn one substance in another. The process of combustion is an oxidation reaction as we can see from the balanced reaction equation that is attached to this answer. Here, the ethanol is burned in oxygen and the result is carbon dioxide and water as shown in the image that have been attached.

Now;

We can see that the number of moles of water is 500.0 g/18 g/mol =28 moles

We can now say that;

one mole of ethanol does produce 3 moles of water

x moles of ethanol would then produce 10.9 moles of water

28 * 1 moles / 3mole

= 9.3 moles

In order to find the mass of the ethanol used;

9.3 moles * 46 g/mol = 427.8 g

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Answer:

Erosion can happen very quickly or very slowly.

e.g splash erosion occurs slowly while gulley erosion occurs very fast.

Answer:

D

Explanation:

Observation vs Inference

An observation is based on factual information that can be found through the use of the 5 senses: touch, taste, smell, sight, hearing. An inference is a guess or conclusion that is made after something is observed.

1.  The clouds mean it is going to rain today.

It's rainy and cold.

The grass is going to get very green after the rain.

Answer:

See explanation and image attached

Explanation:

Esterification is a reaction of an alkanol and an alkanoic acid to yield an ester and water as products. It is analogous to inorganic neutralization reaction.

The process may be acid catalyzed. As mentioned in the question, the process of ester formation between pentanoic acid and n‑propanol first involves the carbonyl in going through an sp3 hybridized intermediate before returning to sp2 hybridized state in the product.

The image of the neutral form of this intermediate as well as the final structure of the ester are both shown in the image attached to this answer.