how many moles in 312.5 grams of calcium

Explanation:

The oxidation number of Ni is +4

Answer:Be

Explanation: Be (OH)2 forms a Be salt with an acid and forms an acid anion with a base

Answer:

4 digits that are 7,5,0,0

Explanation:

You would need to take 5 mL of the 12 M acid and then make up to the 2000 mL mark.

The dilution formula is a mathematical expression used to calculate the new concentration of a solution . The dilution formula can be used to calculate the volume of a solution required in dilution. To use the formula, you must ensure that the units of concentration and volume are consistent

The final concentration of the solution is = Antilog (-1.5) = 0.03 M

Then;

12 * V = 2 * 0.03

Where V is the initial volume of the acid.

V = 0.005 L or 5 mL

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Answer:

there is a gap in the human brain and the skull filled with fluid. woodpecker and bighorn sheep do not have this, so the brain doesn't recoil and hit the skull.

Answer:

C

Explanation:

It is run by Elon Musk, who is determined to get to Mars.

The density of the rectangular block of metal in g/cm³ is 1.87 g/cm³

Density is a measure of the mass of matter contained by a unit volume. It can be calculated by dividing the mass of the substance by its volume as follows;

Density = mass ÷ volume

According to this question, the dimensions of a rectangular metal block of metal A are as follows: length = 13.0cm; width = 6.4cm; height = 8.2cm. If it has a mass of 1287g, the density can be calculated as follows;

Volume = 13 × 6.4 × 8.2 = 682.24cm³

Density = 1287g ÷ 682.24cm³

Density = 1.87 g/cm³

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Answer:

Something or someone you can see invisibility is the opposite of something you cannot see or some thing you cannot see

Explanation:

The product of the reaction as it has been shown above is  butoxymethane.

A chemical reaction is an interaction that takes place between two or more chemical substances to yield a product (s). We should note that the reactants are written at the left hand side of the reaction equation while the products are written at the right hand side of the reaction equation. This is how we show  reaction on paper.

Having said this, the reaction that have been shown in the question would occur by an SN2 synchronous mechanism to yield butoxy methane product.

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Answer:

\([SO_2Cl_2]=0.0175M\)

Explanation:

Hello!

In this case, considering that the decomposition reaction of SO2Cl2 is first-order, we can write the rate law shown below:

\(r=-k[SO_2Cl_2]\)

We also consider that the integrated rate law has been already reported as:

\([SO_2Cl_2]=[SO_2Cl_2]_0exp(-kt)\)

Thus, by plugging in the initial concentration, rate constant and elapsed time we obtain:

\([SO_2Cl_2]=0.0225Mexp(-2.90x10^{-4}s^{-1}*865s)\)

\([SO_2Cl_2]=0.0175M\)

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3.59 mol

1.836 x 10 ²⁵ molecules

Given

230 g SO2

30.5 moles LiNO3

Required

moles and molecules

Solution

mol = mass : molar mass

1 mol = 6.02 x 10²³ particles(molecules, atoms, ions)

1. 230 g x 1 mol/64,066 g  =3.59 mol

2. 30.5 moles x 6.02 x 10 ²³ molecules / 1 mol = 1.836 x 10 ²⁵ molecules

In the image we can see that there are 1 phosphorus (P4) molecules and 7 fluorine molecules.

According to the stoichiometry of the reaction, one molecule of phosphorus (P4) and 6 molecules of fluorine (F2) are needed to form 4 molecules of PF3.

The answer is:

The limiting reagent is phosphorus (P4)

The number pf PF3 molecules formed is 4 and

The number of fluorine atoms/molecules in excess is 1.

Answer:

THERE IS NOTHING MENTION HERE HOW CAN ANYONE KNOW ABOUT IT?]

Explanation:

Answer: the molecular formula of the compound is Fe4O5

Explanation: According to the provided data, it can be inferred that the chemical compound is comprised of 72.3% iron and 27.7% oxygen in terms of their respective masses. Assuming a sample mass of 100 g of the compound, it can be postulated that the sample would comprise of:

A mass of 72.3 grams of iron (Fe) was measured.

A quantity of 27.7 grams of oxygen (O) was measured.

To determine the empirical formula, it is essential to transform the given masses into moles by utilizing their corresponding atomic masses.

The molar quantity of Fe can be computed by dividing the given mass of 72.3 grams by the molar mass of iron, which is 55.85 grams per mole. Employing this formula, we obtain a value of 1.294 moles for the quantity of Fe.

The number of moles of O can be computed by dividing the mass of O by its molar mass. In the present case, the number of moles of O is equivalent to 1.731 mol, given that the mass of O is 27.7 g and its molar mass equals 16 g/mol.

Subsequently, it is necessary to identify the most basic integer ratio of iron (Fe) to oxygen (O) atoms. In order to accomplish this, the quantity of moles attributable to every element is partitioned by the minimal quantity of moles present.

The Fe:O ratio was determined to be 1:1, as indicated by a molar ratio of 1.294 mol Fe to 1.294 mol O.

The stoichiometric ratio between oxygen and iron in the given system is represented by the numerical value of 1.337, which is the result of the division of 1.731 moles of oxygen by 1.294 moles of iron.

The requirement to achieve an integral value for the O:Fe ratio necessitates the application of a common multiplier to both ratios. A straightforward approach to accomplish this task entails the multiplication of both ratios by a factor of 4:

The ratio of Fe to O, expressed as Fe:O, is equivalent to 1 multiplied by 4, which yields a result of 4.

The stoichiometric ratio between oxygen and iron, denoted as O:Fe ratio, is calculated by multiplying the numerical value 1.337 with the factor of 4, resulting in a value of 5.348.

The nearest whole number can be utilized to approximate the O:Fe ratio, yielding the following expression:

The Fe:O ratio exhibits a value of 4.

The ratio between the amounts of oxygen and iron, denoted as O:Fe, is equal to 5.

Hence, it can be derived that the chemical composition of the compound is represented by the empirical formula Fe4O5.

The identification of a compound's molecular formula necessitates the determination of its molecular mass. It is given that the molecular mass is 231.4 g/mol. The calculation of the empirical formula mass for Fe4O5 can be performed.

The calculation of the molecular weight of Fe4O5 can be expressed as follows: the total mass is a result of adding the individual atomic weights of four iron atoms (each with a molar mass of 55.85 g/mol) and five oxygen atoms (each with a molar mass of 16 g/mol), leading to a final mass of 231.4 g/mol.

The identity of the empirical formula and the molecular formula can be inferred, as they share congruent molecular masses.

CO₃²⁻ ion has a trigonal planar geometry around the bold-faced atom, and its bond angle is 120⁰.

The three-dimensional configuration of the atoms that make up a molecule is known as molecular geometry.

In addition to bond lengths, bond angles, torsional angles, and any other geometrical factors that affect each atom's location, it also contains the molecule's overall structure.

The CO₃²⁻ ion possesses a trigonal planar molecular structure and electron geometry because it adheres to the AX₃ generic formula of the VSEPR theory module.

Because the core C atom in the CO₃²⁻ Lewis structure is connected to three bound oxygen atoms. Therefore, the VSEPR theory predicts that the CO₃²⁻ ion exhibits sp2 hybridization.

Thus, option C is correct.

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Answer:

Explanation:

The crabs cannot see the plankton they eat near the ocean floor. For the crabs to see the plankton, some color of visible light would need to reach the plankton so that it can be reflected into the crabs' eyes.

Crabs cannot see the plankton they eat near the ocean floor.

Plankton are a collection of tiny organisms that live at and beneath the surface of lakes, rivers, ponds, and oceans across the planet.

Some crabs have colour coding capabilities , but the crabs to see the Planktons the light must reach the plankton , reflect and reach to the eyes of crabs , but the light does not reach inside the ocean and so crabs see the plankton they eat near the ocean floor.

Hence crabs cannot see the plankton they eat near the ocean floor.

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The author does not provide a description of Mirwais's voice in the article. The three quotations from Mirwais suggest that he is determined and passionate about his music.

He states that he wants to "sing for peace" and that he "believes in the power of music to heal." He also expresses his desire to "spread joy and love" through his music.

The author chose Mirwais Najrabi as the subject of his article because he wanted to highlight the story of a young, talented musician who is overcoming adversity to pursue his passion. The choice of Mirwais as the subject suggests that the main purpose of the article is to inspire and encourage others to pursue their dreams and to show the positive impact that music can have on individuals and communities.

The unity of the article is good. Each paragraph develops the main idea of the young singer's story, and the overall message is that music can be a source of hope and inspiration for individuals and communities. The article flows well, and the use of quotations from Mirwais helps to reinforce the main idea and message.

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Answer: The new volume at different given temperatures are as follows.

(a) 109.81 mL

(b) 768.65 mL

(c) 18052.38 mL

Explanation:

Given: \(V_{1}\) = 571 mL,       \(T_{1} = 26^{o}C\)

(a) \(T_{2} = 5^{o}C\)

The new volume is calculated as follows.

\(\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{571 mL}{26^{o}C} = \frac{V_{2}}{5^{o}C}\\V_{2} = 109.81 mL\)

(b) \(T_{2} = 95^{o}F\)

Convert degree Fahrenheit into degree Cesius as follows.

\((1^{o}F - 32) \times \frac{5}{9} = ^{o}C\\(95^{o}F - 32) \times \frac{5}{9} = 35^{o}C\)

The new volume is calculated as follows.

\(\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{571 mL}{26^{o}C} = \frac{V_{2}}{35^{o}C}\\V_{2} = 768.65 mL\)

(c) \(T_{2} = 1095 K = (1095 - 273)^{o}C = 822^{o}C\)

The new volume is calculated as follows.

\(\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{571 mL}{26^{o}C} = \frac{V_{2}}{822^{o}C}\\V_{2} = 18052.38 mL\)

J.J. Thomson discovered electrons and their negative charge through the cathode ray experiment, leading to the development of the plum pudding model of the atom.

J.J. Thomson, a British physicist, was the first to discover electrons in 1897.

He conducted the cathode ray experiment to identify the negatively charged particles.

The cathode ray tube is a vacuum-sealed glass tube with two electrodes at each end: a cathode and an anode.

When a high voltage electrical current is applied to the electrodes, the tube glows, indicating that the cathode rays are being emitted from the cathode and traveling through the tube towards the anode.

The cathode rays were found to have a negative charge, according to Thomson.

These rays were identified as particles by the presence of a magnet, which caused the particles to bend in the direction opposite to the magnet's polarity.

This discovery indicated that the particles had a charge on them because they were deflected by the magnetic field, which is only possible if the particles have an electric charge.

Thomson further concluded that these particles were about 1,000 times smaller than hydrogen atoms because of the degree of deflection they experienced in the magnetic field.

Furthermore, Thomson created the plum pudding model of an atom, in which electrons are dispersed throughout a positively charged matrix, based on his findings.

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Answer:

What are the compounds

Explanation:

Answer:

Where is the picture?

Explanation:

Explanation:

Molarity, or concentration in amount of matter (mol/L), is the ratio between the amount of matter in the solute (n) and the volume of the solution in liters (V): M = n/V

Here we have:

m = 166 g of KI (solute)

V = 1000 mL = 1L (solution)

So we need to transform 166 g of KI into moles. We use the following formula:

n = m/MM

MM of KI is 166 g/mol

n = 166/166

n = 1 mol

So:

M = 1/1

M = 1 mol/L

Answer: M = 1 mol/L

The statements that describe the information that can be gained from the balanced chemical equation is the correct option is  The physical states of reactants and products, often. The identities of substances involved.  The relative quantities of substances involved.

The equation is said to be balanced equation if the each atoms in the reactant side is equal to the each atom of the product side. The physical state ton balanced the equation will not changed. The number of the moles of the substance will be involved in the balancing the equation.

The how the fast reaction is proceeds and the temperature of the reaction does  not matter in the balaning the equation.

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Answer:

It would take 15 sticks of butter

Explanation:

2 divided by 20 is 0.1

0.1 is how much butter for 1 so now we multiply that by 150

0.1 x 150 = 15

Therefore, you would need 15 sticks of butter for 150 cookies

The partial pressure of the remaining gas that was not measured is 0.8 atm.

This is the individual pressure exacted by each gas in the containing vessel. This partial pressure of individual gases make up the total pressure.

Pt = P₁ + P₂ + P₃ + P₄

5 = 1.2 + 2 + 1 + P₄

5 = 4.2 + P₄

P₄ = 5 - 4.2

P₄ = 0.8 atm

Thus, the partial pressure of the remaining gas that was not measured is 0.8 atm.

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Answer:

The answer is 20

Explanation:

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Answer:

Sweden is the largest of the Nordic countries which are Denmark, Finland, Iceland, Norway, and, of course, Sweden. Sweden's three major cities are Stockholm which is the capital of the country, Gothenburg in the western coast, and Malmö down south.

Sweden is said to have more space to enjoy and relax than most other country. It is a place for people who love to be with nature to seek peace of mind to people who lives by adventure. A perfect vacation spot, Sweden boast of peaceful countryside, lakes and forest, a long coastline of islands good for water sports activities such as sailing and perfect Swedish mountains for skiing during winter. Sweden also has a lot to offer culture vultures and tourist with their rich culture. There are cathedrals and old houses and universities to visit, plus, a smorgasbord of food choices to fill the hungry traveler's stomach. The cities have great pubs and clubs for younger travelers who wants to experience nightlife in Sweden. And there are shopping malls and souvenir shops for everyone to enjoy. Other places of interest are Esrange, a racket launching

facility, Gotland, Sweden's largest island and Kebnekaise, the country's highest mountain.

Answer:

Ferries are sea transport in the form of boat or ship that carries passengers, cargo and sometimes vehicles. It is a type of public transportation that has been around for centuries. It is a cheaper way to travel from one point to another, but lately a trip through a ferry is made not only for financial consideration but for leisure as well. Today's ferries or cruise ships are more efficient and mostly built with the passenger's convenience in mind, and some big ones can accommodate hundreds of passengers, baggage and vehicles in one time. Ferries usually operate on frequent return service. Ferry rides are a relaxing way to travel and to see the sights along the way. One of the world's best ferry destinations is Sweden.

Sweden is the largest of the Nordic countries which are Denmark, Finland, Iceland, Norway, and, of course, Sweden. Sweden's three major cities are Stockholm which is the capital of the country, Gothenburg in the western coast, and Malmö down south.

Sweden is said to have more space to enjoy and relax than most other country. It is a place for people who love to be with nature to seek peace of mind to people who lives by adventure. A perfect vacation spot, Sweden boast of peaceful countryside, lakes and forest, a long coastline of islands good for water sports activities such as sailing and perfect Swedish mountains for skiing during winter. Sweden also has a lot to offer culture vultures and tourist with their rich culture. There are cathedrals and old houses and universities to visit, plus, a smorgasbord of food choices to fill the hungry traveler's stomach. The cities have great pubs and clubs for younger travelers who wants to experience nightlife in Sweden. And there are shopping malls and souvenir shops for everyone to enjoy. Other places of interest are Esrange, a racket launching facility, Gotland, Sweden's largest island and Kebnekaise, the country's highest mountain.

There are just so much outdoor and recreational activities in Sweden, and it is also child-friendly that it has become an ideal family vacation destination. Truly, a trip to Sweden is a rejuvenating experience. But the best way to start the Swedish vacation is by riding a ferry to Sweden.

Riding a Ferry to Sweden

Sweden is a country that can be visited through a ferry from different parts of Europe. There are regular ferry rides from Belgium, Denmark, Estonia, Finland, Latvia, Germany, Norway, Poland, Russia, and United Kingdom. It has become very accessible for travelers and tourist to enjoy the natural beauty and distinct cultural heritage of Sweden. There are a number of sea transport companies that carries passengers, cargo and vehicles that offers regular trips to and from Sweden. Some of the popular ones are Stena Lines, Silja Lines, Birka Cruises, Tallink Lines, Viking Lines, Scandlines, and DFDS. There are ports in major cities of Sweden as well as in Varberg, Helsingborg, Trelleborg, Visby, Ystad among others. Travelers and tourist can book their ferry to Sweden trips through their local travel agents, but they can also conveniently book their travels through the internet.

A luxurious ferry to Sweden usually has suites for honeymooners or multi-cabin that is ideal for family or group of friends making a trip via a ferry an enjoyable experience.

Explanation:

hope it's help you

Answer::

Explanation::

In this question, we have the following reaction:

5 F2 + 2 NH3 -> N2F2 + 6 HF

The enthalpy change is -96.3 kJ

As we can see, in order to form 1 mol of N2F2 it is released -96.3 kJ, but we need to know how much energy is released with 12.7 grams, and using the molar mass of N2F2, 66.01g/mol, we can find how many moles we have:

66.01g = 1 mol

12.7g = x moles

x = 0.192 moles of N2F2 in 12.7 grams

Now, if 1 mol released -96.3 kJ, what abour 0.192 moles:

1 mol = -96.3 kJ

0.192 moles = x kJ

x = -18.5 kJ of energy is released, letter C

1. Water begins to boil - Endothermic

2. Fireworks explode - Exothermic

3. Sweat evaporates cooling your skin - Endothermic

4. Water begins to freeze into ice - Exothermic

5. You ignite your homework assignments once the year is over - Exothermic

6.Sunrays burn your skin - Exothermic

7.Cellular respiration - Exothermic

Exothermic and endothermic refer to two types of chemical reactions or physical processes that release or absorb energy, respectively.

Exothermic reactions release energy in the form of heat, light, or sound. When these reactions occur, they produce a net release of energy into the surroundings, which can often be felt as an increase in temperature. Examples of exothermic reactions include combustion, oxidation, and many types of explosions.

Endothermic reactions, on the other hand, absorb energy from the surroundings in order to proceed. These reactions typically feel cold to the touch and require energy to be added to the system in order to occur. Examples of endothermic reactions include melting, evaporation, and many types of chemical reactions that require heat to be added in order to proceed.

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