how do you do stoichiometry

Answers

Answer 1

suppose we have a reaction as follows :

nA + mB ---> pC + qD

where n,m,p,q are natural numbers

these natural numbers are called stoichiometric coefficients .

Eg:

2P + 3Br2 ---> 2PBr3

here, 2, 3 from reactant side and 2 from product side are called stoichiometric coefficients

hope this helps...


Related Questions

A teacher makes the following statement.

“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”

What topic is the teacher most likely talking about?

distillation of a mixture
filtration of a pure substance
evaporation of a mixture
sorting of a pure substance

Answers

Answer:

distillation of a mixture

Explanation:

Answer:

A.) Distillation of mixture.

Explanation:

edge 2021

why is chemistry chemistry?​

Answers

The concentration in ppm = 125,000 ppm

Further explanation

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

ppm or parts per million (ppm) :

For water solvent = 1 ppm ⇒ 1 mg/L(1 kg=1 L,ρ water=1 kg/L)

In percent mass = 1 ppm ⇒ 1 mg/ 1 kg

Solution contains 0.25 kg of lead in 2 kg of water :

Solvent = water = 2 kg = 2 L

Solute= lead=0.25 kg=250000 mg

So the concentration in ppm :

[tex]\tt ppm=\dfrac{250,000~mg}{2~L}=\boxed{\bold{125,000~ppm}}[/tex]

Answer:

The concentration in ppm = 125,000 ppm

Explanation:

that is why chemistry is chemistry.

How many moles of helium gas are contained in a presurized gas cylinder with an internal volume of 10.0 L at a pressure of 8.91 atm and a temperature of 287.4 K?

Answers

Answer:

n = 3.77 mol

Explanation:

Given data:

Number of moles = ?

Volume of gas = 10.0 L

Pressure = 8.91 atm

Temperature = 287.4 K

Solution:

Formula:

PV = nRT

R = general gas constant = 0.0821 atm.L/ mol.K

by putting values,

8.91 atm × 10.0 L = n × 0.0821 atm.L/ mol.K ×287.4 K

89.1 atm.L = n × 23.60 atm.L/ mol

n =89.1 atm.L / 23.60 atm.L/ mol

n = 3.77 mol

Please help me out with these chemistry questions before 11:59pm

Answers

Answer:

The bond in a homonuclear diatomic molecule is non-polar due to the electronegativity difference of zero

Explanation:

Using the activity series, the reaction 2Al+6HBr-2 AlBr3+3 H2 will only occur if.....Al is above Be on the periodic table or heat is added to the reaction or a precipitate forms or Al is above H on the activity series

Answers

Answer:

Al is above H on the activity series

Explanation:

The given chemical reaction is expressed as:

            2Al + 6HBr →  2AlBr₃ +  3H₂

The reaction above is a single displacement or replacement reaction and will only occur if Al is above H on the activity series.

The driving mechanism of such reaction is the position of the species on the activity series. The higher an atom is the more reactive and easier it will displace the lower ones.

What type of reaction mechanism accounts for the reaction of an alkene with aqueous acid to give an alcohol

Answers

Answer: Electrophilic addition reaction

Explanation:

Alkenes are compounds which have at least one double bond between the carbon atoms in the molecule. This is an indication of a shortage of hydrogen atoms. The compound is said to be unsaturated. As an unsaturated compound alkene undergoes the following reaction:

-- Combustion reaction

-- Hydrogenation reaction

-- Addition reaction.

The addition reaction of alkenes occur due to the presence of pi electrons in which an electrophile attacks the carbon-carbon double bond to form the addition products. An electrophile is a molecule that has the affinity to react with other molecules containing a donatable pair of electrons.

A typical example of reaction between alkene and acid is in the decolourisation of acidified potassium tetraoxomanganate(VII) with ethene. The oxygen supplied to the reaction breaks the double bond to yield ethane 1,2 diol ( an alcohol).

The reaction of an alkene with the acid has been performed with the carbocation intermediate formation, followed by the nucleophilic substitution reaction.

The alkenes have been the hydrocarbons with the presence of one double bond in the structure. The double bond has been consisted of the pi electrons.

The alkene has been bonded with the pi-electron, thus in the chemical reaction the pi bond-breaking results in the partial negative and positive charge to the carbon atoms. The negative OH group has been the nucleophile that is attracted by the negatively charged carbon atom, and the bond formation results in the alcohol.

The reaction for an alkene with acid has been given in the image attached.

Thus, the reaction of an alkene with the acid has been performed with the carbocation intermediate formation, followed by the nucleophilic substitution reaction.

For more information about the reaction mechanism, refer to the link:

https://brainly.com/question/24924720

Lithium chloride crystallizes in a face-centered cubic unit cell with chloride ions occupying the lattice points and lithium ions occupying octahedral holes. How many chloride ions surround each lithium ion in LiCl?

Answers

Answer:

6

Explanation:

The coordination number of a particular crystal structure arrangement is defined as the number of nearest neighbor atoms or ions surrounding an atom or ion.

We must note that in salts of the type MX, the coordination number of each ion must be equal. The structure of LiCl is built by placing each unit cell next to another such that ions residing in the corner, edge or face sites are shared between adjacent unit cells. The LiCl is in FCC arrangement.

Hence in LiCl, each Li+ ion is surrounded by 6 chloride ions.

Please help I'm so confused

Methylphenidate is used to treat ADHD (attention deficit hyperactivity disorder). A patient is prescribed two 10.1 mg Methylphenidate tablets each day. Methylphenidate patches release Methylphenidate into the body by absorption through the skin. The patches come with different amounts of Methylphenidate. The maximum amount of Methylphenidate in one brand of patch supplies a patient with 20. mg of Methylphenidate per day.


Determine the amount of Methylphenidate a patient may take using 2 tablets (in mg) Be sure your answer has the correct number of significant figures.​

Answers

Answer:

They work by increasing activity in the brain, particularly in areas that help control attention and behaviour. Methylphenidate is used to treat children with attention deficit hyperactivity disorder (ADHD). It helps with hyperactivity and impulsive behaviour, and allows them to concentrate better.

Explanation:

What happened when Crookes placed a solid object inside
the cathode ray tube?
a
The object cast a shadow on the other end of the
tube.
b The object exploded.
С
The cathode rays burned a small hole in the
object.
d The cathode ray tube stopped working.

Answers

The answer I believe would be C hope this helps

If two oxygen atoms bond covalently, the bond is
A) nonpolar ionic

B) nonpolar covalent

C) polar covalent

D) ionic

Answers

Answer:

probably b i got nothing but i hop eit is good

Explanation:

HELP HELP
There is only one type of receptor to sense stimuli
true or false?

Answers

they deserve a brainliest :)

The part of memory which temporarily holds information for later use is refered to as
A. clipboard. B. Clipart. C. Desktop. D. Flash disk​

Answers

Answer:

D - Flash Disk

Explanation:

Determine the mole ratio between oxygen and water for the following equation:
2 H2 + O2 - 2 H2O
A. 1:2
B. 1:1
C. 2:2
D. 2:1

Answers

Answer:2.2

Explanation:

Which is the product of these numbers, to the appropriate number of significant digits?

91.40 x 2.00 =

Answers

Answer:

180

Explanation:

just multiply and round to whole number

What organic product would you expect from the reaction of ethylmagnesium bromide (CH3CH2MgBr) with H2O.

Answers

Answer:

It would produce ethane (CH₃CH₃)

Explanation:

Ethylmagnesium bromide (CH₃CH₂MgBr) is a Grignard's reagent.

It is a highly reactive substance, and as any alkylmagnesium bromide

(R-CH₂MgBr) it reacts with water to produce an alkane (R-CH₃). R stands for any carbon structure bonded to that functional group.

When glucose is reduced the product is
Select one:
a. maltose
b. glucitol
O c. galactose
O d. gluconic acid
e. sucrose

Answers

Answer:

b) Glucitol

Explanation:

The glucose loses the carbonyl group and its transformed to CH2OH

(30 POINTS AND BRAINLIEST, THIS IS DIMENSIONAL ANALYSIS! PLEASE HELP & SHOW WORK!) (only right answers otherwise I WILL REPORT)

In a primitive barter society, the following rates of exchange exist: 1 fot = 5 vum, 2 sop = 3 tuz, 4 bef = 5 tuz, and 9 fot = 2 bef. A man has 4 sop and wants to convert all his possessions into vum. How many vum can he trade for?

Answers

The number of vum the man can trade for is = 108 vum

Calculation of the number of vum

The number of sop the man has = 4 sop.

But the exchange rates are as follows:

1 fot = 5 vum,

2 sop = 3 tuz,

4 bef = 5 tuz,

9 fot = 2 bef

Using,

2 sop = 3 tuz,

4sop = X tuz

X tuz = 4×3/2 = 13/2 = 6 tuz.

Using,

4 bef = 5 tuz,

X bef = 6 tuz

X bef = 6×4/5

X bef =24/5 = 4.8 bef

Using,

9 fot = 2 bef

X fot = 4.8 bef

X fot = 9 × 4.8/2

X fot = 21.6 fot.

Using,

1 fot = 5 vum,

21.6 fot = X vum

X vum = 5 × 21.6/1

X vum = 108 vum

Learn more about exchange rates here:

https://brainly.com/question/25970050

#SPJ1

See Picture for Question. I have other questions as well.

Answers

Answer: here lol

Explanation:

hope it helps just read very carefully

How many moles are there in 1.0 g of H2?

Answers

Answer:

4-5

Explanation:

maybe 5

Which of the following is an effect we can already observe on Earth that results for global warming?

stronger hurricanes
more severe wildfires
less sea ice in the Arctic in summertime
all of the above

Answers

Answer:

All of the above

Explanation:

I don't understand ​

Answers

Answer:

A 9 moles of reactants changes into 11 moles of product

Explanation:

determine the vapor pressure in atm of water in an aqueous solution of 12% BY MASS EHTYLEENE GLYCOL (ANITFREEZE) IF THE VAPOR PRESSURE OF

Answers

The given question is incomplete, the complete question is:

Determine the vapor pressure (in atm) of water in an aqueous solution of 12% by mass ethylene glycol (antifreeze) if the vapor pressure of pure water at that temperature is 0.095 atmospheres.

Answer:

The correct answer is 0.091 atm.

Explanation:

Based on the given information, the mass of ethylene glycol is 12% by mass, which means 12 grams of ethylene glycol dissolved in 88 grams of water.

The moles of a substance can be determined by using the formula,

Moles = Weight/molecular mass

Number of moles of water = mass/molecular mass

= 88g/18g/mol

= 4.88 moles

Number of moles of ethylene glycol = Mass/molecular mass

= 12 grams/62g/mol

= 0.193 moles

Mole fraction of water will be,

Mole fraction = number of moles of water/Number of moles of water+Number of moles of ethylene glycol

Mole fraction = 4.88/4.88+0.193

= 0.961

Vapor pressure of water can be determined by using the formula,

Vapor pressure = Vapor pressure of pure water * Mole fraction of water

= 0.095 * 0.961

= 0.091 atm.

Which of these elements has the highest first ionization energy?
a) As
b) Ga
c) Bi
d) Cs
e) K

Answers

Answer:

Cesium (Cs)

Explanation:

This eliment has an ionization energy of 3,8939

What is the significance of temperature t

Answers

Answer:

send a pic or more info

Explanation:


What would you expect the balance to read when the reaction has finished? Circle the correct answer.
179 g , 180 g , 181 g
Answer all of the questions pllllzzz

Answers

Answer:

180 g

Explanation:

At the end of the reaction, the mass is still expected to be 180g this is because in every chemical reaction, mass must be conserved.

According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed".

Bonds are broken and elements rearranged. The mass is thereby constantThe sum of the mass of the reactant is then even equal to the mass of the product derived.

Which ions have ten electrons in the outermost subshell?

Answers

Explanation:

There are ten d electrons in the outermost d subshell for Zn2+.

Treatment of 2-amino-2-methylcyclohexanone with methyl 2,4-dibromobutanoate in the presence of a nonnucleophilic base, , involves two successive SN2 reactions and gives compound A. Propose a structural formula for compound A.

Answers

Answer:

Explanation:

The proposed structural formula for compound A can be seen in the diagram below with its reaction mechanism. In the first SN2 reaction, we could see how anime reacts with the primary alkyl bromide since it is more reactive. However, the product derived undergoes a subsequent SN2 reaction in the second stage to produce a cyclic product.

classify the following as a heterogeneous, homogeneous, or a pure substance:

Lemonade with no pulp

Answers

Answer:

pretty sure it's heterogeneous

Explanation:

Also, I saw you added me as a friend and I'm kinda curious as to why :)

Answer:

Heterogeneous mixture

Explanation:

Which of the following pairs of elements will not form an ionic bond with
each other.

Sodium and Argon

Calcium and Oxygen

Magnesium and Chlorine

Aluminum and Nitrogen


Answers

Answer:

Sodium and Argon

Explanation:

sodium and argon won’t form an iconic bond

enantiomeric pair and its application

Answers

Explanation:

Enantiomers are pairs of non-identical molecules that are non-superimposable mirror images of each other and that have at least one chiral carbon or chiral center, making them chiral compounds. They have similar chemical properties, except for when they interact with other chiral compounds.

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