a chloride of rhenium contains 63.6% rhenium. what is the formula of this compound?

Answer:

m = 16.67 g of Hg

Explanation:

Let's write the overall decomposition reaction that is taking place:

2HgO ---------> 2Hg + O₂

According to the balanced reaction, we can see that the mole ratio between HgO and Hg is the same (2:2 or 1:1), therefore, we can assume that the moles reactants of HgO would be the moles produced of Hg. So, in order to get the grams of mercury, we need to determine the moles first.

To get the moles, we need to use the following expression:

moles = mass / MM   (1)

The molar mass of HgO can be calculated using the atomic weights, which are:

Hg: 200.59 g/mol ; O: 15.999 g/mol

MM HgO = 200.59 + 15.999 = 216.589 g/mol

The moles are:

moles HgO = 18 / 216.589 = 0.0831 moles

As we stated before, moles reactants are the same moles produced, so:

moles HgO = moles Hg = 0.0831 moles of Hg.

Finally, to get the mass, we just solve the mass from (1):

m = moles * MM   (2)

m = 0.0831 * 200.59

Hope this helps

2.49 x [tex]10^{-4}[/tex] moles is equal to 1.5×[tex]10^{20}[/tex]. The number of moles is equal to the number of molecules divided by Avogadro's number, 6.022×[tex]10^{23}[/tex].

This means that 1.5×[tex]10^{20}[/tex]moles are equal to

1.5×[tex]10^{20}[/tex]/6.022×[tex]10^{23}[/tex]

0.24908×[tex]10^{-3}[/tex]

2.49 x [tex]10^{-4}[/tex] moles.

Avogadro's number: Avogadro's number is a constant used in chemistry to represent the number of atoms or molecules in a mole of a substance. It is equal to 6.022 x [tex]10^{23}[/tex]. Or we can say that Avogadro's number is, the number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction.

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[Ar]4s23d6 the electron configuration of the metal ion in Fe(NO3)3.

The noble gas krypton, which is isoelectronic with As arsenic 3 ion (As3), is isoelectronic with [Ar]3d104s2sp6 because it has gained three electrons.

Transition-metal ions are frequently referred to as having dn configurations because their valence electrons are mostly found in d orbitals. For instance, it is claimed that the Co3+ and Fe2+ ions have a d6 configuration.

The number of protons in the atomic nuclei of arsenic, abbreviated As, is 33. 33 electrons would likewise be present in a neutral As atom.

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The percent yield for the reaction in this example is 100%, which is equal to the theoretical yield of NaBr from 2.36 mol FeBr3 of 7.08 mol NaBr.

The lesser amount, or 13.7 g NaBr, represents the potential yield. 15.45 grams of NaBr can never be produced because after 13.7 grams of NaBr are created, the reaction runs out of NaI and stops generating NaBr product. As the limiting reactant, NaI is well-known.

The final answer is expressed in percent by dividing the experimental yield by the theoretical yield and multiplying the result by 100. In general, the percent yield value is less than 100%,

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Answer: 87%.

Explanation:

Answer:

carbon dioxide produced, or carbon monoxide, soot produced and Soot can cause breathing problems and it blackens buildings.

Explanation:

During complete combustion carbon and hydrogen combine with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). During incomplete combustion part of the carbon is not completely oxidized producing soot or carbon monoxide (CO).

Answer:

Helium gas

Explanation:

a method you could use to remember the Diatomic molecules is HOFBrINCl

which stands for all of the Diatomic molecules and as you could observe Helium is not included!

Answer:

Helium gas

Explanation:

because it's helium :/

The number of moles of MgCO3 that is present in the given mass of magnesium carbonate is 2.99 moles.

The number of moles can be defined as the ratio of given mass over molar mass. The chemical that is given is magnesium carbonate having molar mass of 84.314 g/mol and the given mass of the same is 252.939 grams.

The formula for number of moles that is 'n' can be given as follows:

n= m/M where m is the given mass and M is the molar mass.

Substituting the values,

n= 252.939 grams /84.314 grams/mol

n=2.99 moles

Therefore, the number of moles of MgCO3 is 2.99 moles.

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Answer:

Hidrochloric Acid

Explanation:

the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2 is -1 and 0

An atom's oxidation number (also known as oxidation state) in a chemical is an amount that represents the amount of electron density gained or lost by the atom during in the formation of the compound. In general, the oxidising number of an element in a compound can be determined using the following rules: n element's oxidising number is null whenever it is unrestricted (uncombined). The oxidation number of a polyatomic ion is equivalent towards the ion's charge. We can use these rules to calculate the oxidation number of the oxygen atoms in H2O2 and O2: In H2O2, the oxidation number of the oxygen atoms is -1. This is because the compound is neutral and the hydrogen atoms have an oxidation number of +1, so the oxygen atoms must have an oxidation number of -1 in order for the sum of all the oxidation numbers to be zero. In O2, the oxidation number of the oxygen atoms is 0. This is because the compound is a diatomic molecule and the oxidation number of the free element oxygen is 0.

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The total random kinetic energy of all the molecules in one mole of hydrogen at a temperature of 300k is 3741.3 J.

Given temperature (T) = 300K

The number of moles of hydrogen given are (n) = 1

Molecular weight of hydrogen (M) = 1g

Let the kinetic energy = KE

We know that Kinetic Energy (KE) = 1.5nRT where R = Rydbergs constant

So, KE (total) = 1.5nRT,

the total random kinetic energy is KE = (1.5) x (1) x (8.314) x (300) = 3741.3J/mol

The energy of motion is known as kinetic energy, and it can be observed in the motion of objects or subatomic particles. Examples of kinetic energy in action include a person walking, a baseball soaring through the air, a piece of food falling from a table, and a charged particle in an electric field.

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the element that was reduced in this redox reaction is Fe

A redox reaction, also known as an oxidation-reduction or redox reaction, involves the exchange of electrons between chemical entities (the atoms, ions, or molecules involved in the reaction). Redox reactions occur everywhere; they are involved in the burning of fuels, the rusting of metals, and even the processes of photosynthesis and cellular respiration.Some species experience oxidation, or the loss of electrons, while others experience reduction, or the gain of electrons, during a redox process. Take rust, which results from the interaction of iron and oxygen:The third selection from the options presented above is the right response. The element that was reduced in the described redox reaction was Fe, or iron. It now has a neutral charge after having its +3 charge lowered.

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Answer:

I have for Decompostion

Explanation:

A decomposition reaction occurs when one reactant breaks down into two or more products. It can be represented by the general equation: AB → A + B. In this equation, AB represents the reactant that begins the reaction, and A and B represent the products of the reaction

Two solitary sigma bonds are visible in the Lewis structure between the hydrogen and oxygen atoms.

The octet rule is a theory that describes how atoms share electrons so that each atom has eight electrons in its outer shell. This idea is the foundation of a Lewis structure. An oxygen atom, as an illustration, has six electrons in its outer shell.

The entire molecule's electron density is concentrated only around the core C in the CCl4 Lewis structure. Two nitrogen atoms are connected by a triple bond in the N2 Lewis structure.

In the reaction described above, PH3 is acting as a Lewis base because of the single electron on the P atom.

A double bond exists between two oxygen atoms in the Lewis structure of O2. Oxygen atoms must form two bonds in order to comply with the octet rule. The oxygen (red) and hydrogen (white) atoms are held together by powerful connections known as covalent bonds.

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A vitamin supplement is a dietary supplement containing one or more essential vitamins, typically in the form of a pill, capsule, or tablet.

What are Vitamins?

Vitamins are a group of organic compounds that are essential for normal cellular functioning. They are required for a wide range of bodily functions, such as metabolism, growth, development, and immunity. They can be found naturally in food sources or taken as dietary supplements. There are 13 essential vitamins, including vitamins A, C, D, E, K, and the B vitamins.

The mass of fluorine that can be recovered from the vitamin is 455.9 mg (50.51% of 900 mg). The mass of iron that can be recovered from the vitamin is 444.1 mg (the remaining amount of 900 mg).

To calculate this, we need to use the percent composition formula:

Mass of Element = (Percent Composition/100) x Total Mass

Mass of Fluorine = (50.51/100) x 900 mg = 455.9 mg

Mass of Iron = (100 - 50.51)/100 x 900 mg = 444.1 mg.

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The final concentration of the mixture depends on the value of x.

Value is the worth of something. It can refer to the monetary worth of an item or service, the usefulness of something, or the importance of an idea, belief, or experience. Value is a subjective concept and can vary from person to person. Generally, it is the positive attributes that an individual or group associates with something that determines its value. The economic concept of value is based on the idea that the value of a good or service is determined by its cost, supply, and demand.

The final concentration of the mixture is equal to:
(200 mL x 10%) + (x mL x 40%) / (200 mL + x mL)

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Answer:

a

Explanation:

boiling point of 111ºC and hexane, with a boiling point of 69ºC, is 42ºC, making these two substances most easily separated

Carbohydrates, is 60% of what your food made up of and it is composed of carbon, hydrogen and oxygen.

Carbohydrates are known to be the group of organic compounds that are an important source of energy for the body. They are composed of carbon, hydrogen and oxygen and are classified as simple or complex depending on their chemical structure. Monosaccharides, also called monosaccharides, include glucose, fructose, and galactose, and are found in foods such as fruit, table sugar, and honey. Complex carbohydrates, also called polysaccharides, contain starches and fibers and are found in foods such as grains, legumes, and vegetables. Carbohydrates play an important role in providing energy for the body, maintaining proper brain and nervous system function, and supporting tissue growth and repair.

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Stomach ache, gassy ,no appetite is related to problems with digestive tract while sneezing all the time, runny nose is related to respiratory system while having a very hard time remembering people's is related to nervous system while seeming to be catching every disease that comes around,taking a long time to get better is related to immune system.

It consists of the gastrointestinal tract along with the accessory organs which are present in digestion process . It involves the breakdown of complex food into smaller components which can be easily assimilated and absorbed by the body.

The digestion process has 3 phases: cephalic phase , gastric phase and intestinal phase.Cephalic phase begins with secretion of gastric juices from gastric glands in response to sight and smell of food.It involves chewing and chemical breakdown of food by the action of digestive enzymes ,saliva in the mouth contain enzymes like lipase and amylase which are secreted by the salivary and serous glands present on the tongue.

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Answer: Hot water freezes faster.

Explanation: It is because of the Mpemba effect taking place, and even though it seems impossible, it could have less dissolved gas in it, or even take up less mass because of this.

Answer:

4 g

Explanation:

First you need to write a balanced chemical equation. You are given thatmethane is burned, meaning a combustion reaction in which carbon dioxide and water are released.

Unbalanced: CH4 + O2 ---> CO2 + H2O

Balanced: CH4 + 2O2 ---> CO2 + 2H2O

Givens:

X grams CH4 (Molecular mass 16.0 grams)

9 grams H2O (Molecular mass 18.0 grams)

11 grams CO2 (Molecular mass 44.0 grams)

Mole ratio: 1:2:1:2 (CH4:O2:CO2:H2O)

Then you need to find which of the reactants are the limiting reactant and which is the excess reactant. The limiting reactant is what you will base the rest of the problem on. To do this, you convert each measurement to moles from grams.

11 g CO2 / (44.0 g) = 0.25 moles CO2

9 g H2O / (18.0 g) = 0.5 moles

n of CH4 = n of CO2 = n of H2O /2 = 0.25 moles

m of CH4 = n* Mw = 0.25 * 16.0 = 4 g

The correct answer is : Nitrogen's molecule bends into a trigonal pyramidal shape due to the presence of one lone pair of electrons

O eg=tetrahedral, mg=trigonal pyramidal

The electron geometry (eg) of NCl3 is determined by the positions of the electrons around the central atom, nitrogen (N). NCl3 has one lone pair of electrons on nitrogen and three bonding pairs of electrons with chlorine atoms, so the electron geometry is tetrahedral. NCl3's molecular geometry (mg) is determined by the atom positions in the molecule. In a trigonal pyramidal shape, NCl3 has one nitrogen atom in the centre and three chlorine atoms surrounding it. Nitrogen's molecule bends into a trigonal pyramidal shape due to the presence of one lone pair of electrons. Electron geometry, also known as electron pair geometry, is the arrangement of electron pairs in a molecule or ion around a central atom. It is determined by the number of electron pairs surrounding the central atom, which includes both bonding pairs and lone electron pairs. The electron geometry can be used to predict the overall shape of a molecule or ion and also helps to understand the polarity of the molecule.

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4.21 moles of SnO₂ are needed to produce 500.0 grams of Sn for the given reaction.

Tin oxide, is a compound with the formula SnO₂. It is a white or gray powder that is insoluble in water but soluble in strong acids and strong alkalis. Tin oxide is widely used as a pigment in ceramics, glasses, and paints, and in the manufacture of electronic devices such as transistors and solar cells. It is a versatile compound with a wide range of uses and can undergo several important reactions such as: Reduction to tin metal, formation of tin dioxide, formation of tin salts by reaction with acids.

For the given reaction:

SnO₂ + 2H₂ → Sn + 2H₂O

Mole ratio of SnO₂ and Sn is 1:1; this means 1 mole of SnO₂ is required to prepare each mole of Sn.

Now, for the moles of Sn:

n = m/M

Where, n = number of moles

m = mass of Sn (500 g)

M = molar mass of Sn (118.71 g/mol)

n = 500/118.71

n = 4.21 moles

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Answer:

The ion with the largest size is Cs+.

Explanation:

The size of an ion is determined by the number of electrons it contains and the arrangement of those electrons in its electron cloud. Ions with a larger number of electrons will generally have a larger size because their electron clouds will be more diffuse and occupy more space. Ions with a smaller number of electrons will have a smaller size because their electron clouds will be more compact.

In general, ions in the same group of the periodic table will have a similar number of valence electrons and will be similar in size. For example, the F- ion and the O-2 ion both belong to Group 17 and have 7 valence electrons, so they are expected to be similar in size. Similarly, the Cs+ and Al+3 ions both belong to Group 1 and have a single valence electron, so they are also expected to be similar in size.

However, the Cs+ ion is much larger than the Al+3 ion because it has a larger number of total electrons. Cs+ has 55 electrons, while Al+3 has only 13 electrons. The larger number of electrons in Cs+ results in a more diffuse electron cloud and a larger overall size. Therefore, among the ions listed, Cs+ has the largest size

2.87 g of silver chloride can be made by reacting 200.0 mL of calcium chloride with 170.0 mL of silver nitrate, both of which have a 0.23 M silver nitrate concentration. Chemically, silver chloride is a substance.

AgCl is the chemical formula for this. It is generally known that this white crystalline substance is only weakly soluble in water. Silver chloride changes from grey to black or purplish in hue upon illumination or heating, indicating the presence of silver. As the mineral chlorargyrite, AgCl can be found in nature. Chemical processes take place everywhere around us, from the food our bodies metabolize to how the sunlight we receive is produced.

silver chloride mass: m (AgCl)=0.02*143,32g/mole=2.87 g, where n (AgCl) = (0.02*2)/2=0.02 moles.

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Answer:

10.33 meters (33.78 feet).

Explanation:

1 bar = 10.33 mH₂O, 1 mH₂O = 0.098 bar, hence 10.33 mH₂O/0.098 bar = 10.33 m.

Distance can be measured by centimeters (cm) and kilometers (km).

Distance is defined as the total movement of an object without any regard to the direction. Distance is the length of the route between the two points.

SI unit of distance is the meter (m). Short distances may be measured in the centimeters (cm), and the long distances may be measured in kilometers (km).  For example: Measure the distance from the bottom to the top of a sheet of paper in centimeters and the distance from your house to your school. Maps are also used to measure the the distance.

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Answer:

Gastritis can be caused by irritation due to excessive alcohol use, chronic vomiting, stress, or the use of certain medications such as aspirin or other anti-inflammatory drugs. It may also be caused by any of the following:

If gastritis is left untreated, it can lead to a severe loss of blood and may increase the risk of developing stomach cancer.