một oxit của photpho có thành phần trăm của P bằng 43,66% . Biết phân tử khối của Axit bằng 142đvC. Công thức hóa học của Axit là ?

Answer:

8.87 × 10³ moles.

Explanation:

To convert number of molecules of sulfur hexafluoride (SF6) to moles (n), we divide by Avogadro's number (6.02 × 10²³)

That is; n = N ÷ nA

According to the question, 5.34 x 10^27 molecules of SF6 was given in this question. Hence, the number of moles it contains is given as:

n = 5.34 x 10^27 ÷ 6.02 × 10²³

n = 5.34/6.02 × 10^ (27-23)

n = 0.887 × 10⁴

n = 8.87 × 10³ moles.

Answer:

Both aldehydes and ketones contain a carbonyl group a functional group with a carbon oxygen double bond, hence the carbonyl in aldehydes and ketones forms sp²hybridization.

Explanation:

The structure of carbonyl group is -C=O-

The hybridization of carbon can be identified by couting the number of surrounding atoms.

In carbonyl compounds, carbon is directly bonded with three atoms.

One is oxygen, and the other two are other carbons.

With oxygen carbon has a double bond.

Hence, this three corresponds to sp2 hybridization.

Thus, the given statement is correct.

Answer:

En el grupo de los no metales se incluyen los halógenos​ (flúor, cloro, bromo, yodo, astato y téneso), que tienen 7 electrones en su última capa de valencia y los gases nobles (helio, neón, argón, kriptón, xenón, radón), que tienen 8 electrones en su última capa (excepto el helio, que tiene 2).

Explanation:

halógenos

Answer:

1,4

Explanation:

Answer: Covalent bonding is when atoms of different elements  share electrons

Explanation: Taking Methane CH₄

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, sharing of electron is the only basis for the formation of covalent bond in methane.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Carbon has an electrical configuration of 2,4. Hydrogen only has one electron in its valence shell, whereas carbon contains four electrons. In order to create methane, carbon forms a covalent connection with four hydrogen atoms, sharing its four electrons with them.

Therefore, sharing of electron is the only basis for the formation of covalent bond in methane.

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Answer: 22.7848% F or 23%

Explanation: %F = 3.6g/15.8g • 100% = 22.7848% F

The percentage composition of hydrogen in the given sample is equal to 31%.

The percentage composition of a given compound can be described as the ratio of the quantity of each element to the total quantity of individual elements in the compound multiplied by 100. The quantity can be measured in terms of grams of the elements present in the sample.

The percent composition is expressed in its composition in terms of all the elements present. Thus, it helps in the chemical analysis of any given compound.

The percentage composition is expressed using the following formula,

Percentage composition of E = (E/T) × 100

Where E represents the total quantity of element E present in the compound and T represents the total quantity of all the elements present in the compound.

Given, the mass of the F, H, and C is 3.60g, 4,90 g, and 7.30 g respectively.

The total mass of the given sample = 15.8 g

The mass of the hydrogen in the sample = 4.90 g

The percent composition of H = (4.90/15.8) × 100 = 31 %

Therefore, the percent composition of hydrogen in this sample is 31%.

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Answer:

The percentage efficiency of the electrical element is approximately 82.186%

Explanation:

The given parameters are;

The thermal energy provided by the stove element, [tex]H_{supplied}[/tex] = 3.34 × 10³ J

The amount thermal energy gained by the kettle, [tex]H_{absorbed}[/tex]  = 5.95 × 10² J

The percentage efficiency of the electrical element in heating the kettle of water, η%, is given as follows;

[tex]\eta \% = \dfrac{H_{supplied} - H_{absorbed} }{H_{supplied}} \times 100[/tex]

Therefore, we get;

[tex]\eta \% = \dfrac{3.34 \times 10^3 - 5.95 \times 10^2}{3.34 \times 10^3} \times 100 = \dfrac{549}{668} \times 100 \approx 82.186 \%[/tex]

The percentage efficiency of the electrical element, η% ≈ 82.186%.

Answer:

the last answer is right.

Answer:

overall I think one answer

Answer:

2HCl → H2 + Cl2 = decomposition

NaF + KBr → NaBr + KF = double replacement

Mg + MnCl2 → Mn + MgCl2 = single replacement

2Na + 02 → Na2O2 = combination

Explanation:

A chemical reaction involves the conversion of one or more substances called REACTANTS into other substances called PRODUCTS. There are different types of reactions depending on how it occurs, they include:

- Combination or synthesis reaction is a type of reaction in which two or more elements combine to form a single product. Example is:

2Na + 02 → Na2O2

- Single replacement is a type of reaction where one element is replaced by another in a compound or molecule. Example below shows that Manganese (Mn) is replaced by magnesium (Mg):

Mg + MnCl2 → Mn + MgCl2

- Double replacement is a type of reaction where two elements are replaced by other elements at a time. Example is:

NaF + KBr → NaBr + KF

- Decomposition is a type of reaction in which one molecule or compound is broken down into two or more products. Example is:

2HCl → H2 + Cl2

Answer:

A gamma wave has higher energy than a radio wave.

Answer:

If there were multiple products, we can take each product and mixed with a sample of a pure compound that we suspect might be the same as the product. Then, we taking the melting point of this mixture that contains one of our product and pure sample. Then, we can observe the change in melting point, if there is no change in melting point or the melting stays in the same range of the pure compound. Then, the that product along with the pure sample are actually the same compound, not a mixture of two compounds. However, if the melting point for our pure sample compound changed or didn't stay in the same range after the mixing with on of our products. then we can conclude that this product and the pure sample are completely different compound, and indeed they are a mixture.

Answer:

anthropogenic sources like landfills, agricultural activities,coal mining and combustion and some sources are natural ones

Answer:

0.3kg

Explanation:

Answer:

I don't know I don't know about question but I can try to find it

Explanation:

I don't know about question but I can try to find it

Answer:

a

Explanation:

Its because ammonium has thee hydrogen atoms

Answer:

[tex]\boxed {\boxed {\sf SO_3}}[/tex]

Explanation:

An empirical formula shows the smallest whole-number ratio of the atoms in a compound.

So, we must calculate this ratio. Since we are given the amounts of the elements in moles, we can do this in just 2 steps.

The first step is division. We divide the amount of moles for both elements by the smallest amount of moles.

There are 0.300 moles of sulfur and 0.900 moles of oxygen. 0.300 is smaller, so we divide both amounts by 0.300

The next step is writing the formula. We use the numbers we just found as the subscripts. These numbers go after the element's symbol in the formula. Remember sulfur is S and there is 1 mole and oxygen is O and there are 3 moles.

This formula is technically correct, but we typically remove subscripts of 1 because no subscript implies 1 representative unit.

[tex]\bold {The \ empirical \ formula \ for \ the \ compound \ is \ SO_3}}[/tex]

Answer:

12.01 grams per mole

Explanation:

theres no sample or example so if theres grams of Carbon, convert it to moles using 12.01g/mol

Answer:

B

Explanation:

Exergonic reactions are also called spontaneous reactions, because they can occur without the addition of energy. ... In this case, the products, or final state, have more free energy than the reactants, or initial state. Endergonic reactions are non-spontaneous, meaning that energy must be added before they can proceed.

Exergonic reactions were often known as spontaneous reaction. since they can take place without the expenditure of energy.

A reaction wherein energy is emitted mostly in presence of light or heat was known as just an exothermic reaction.

What is spontaneous reaction?

A spontaneous process would be one that happens without the system receiving any outside input.

Because exergonic events could proceed without the supply of energy, they are sometimes known as spontaneous reactions. The products possess greater free energy as compared to  the reactants example. Endergonic reactions were non-spontaneous, which means they require the addition of energy before they can begin.

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Answer:

25 PRECENT

Explanation:

2H2O+O2--->2H2O2  

8.5 gm H2O2=0.25 mole  

hence H2O is also 0.25 mole i.e.4.5 gm  

O2is 0.125 mole i.e.4 gm

Answer:

the answer is c kept in blue and with light

Answer: the answer is C

IF U MIGHT NEED AN EXPLANATION FEEL FREE TO COMMENT

The laboratory equipment like the burette, pipette, and measuring cylinders are used in process of titration process. The solution of NaOH is added by the burette. Thus, option C is correct.

Titration has been the analytical technique that uses the known and measured quantity of the solution to estimate the volume of another solution with an unknown volume and known molar concentration.

The laboratory equipment like burette, pipette, and measuring cylinders are used in measuring the volume in the titration process. The burette is filled with sodium hydroxide to measure its quantity.

The pipette is used to transfer the volume of the solution that is known (hydrochloric acid) and the measuring cylinder is used to measure the liquid (water) that is used in chemistry experiments.

Therefore, option C. pipette, burette, and measuring cylinder are the apparatus used in the titration process.

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Answer:

241.28 g NaCl(s)

Explanation:

Given 1.25 x 10²⁴ molecules of Cl₂ = 1.25 x 10²⁴molecules Cl₂(g)/6.023 x 10²³ molecules/mole = 2.08 mole Cl₂(g)

2Na(s)    +      Cl₂(g)      =>   2NaCl(s)

excess        2.08mole          ? mole

∴moles NaCl(s) formed from 2.08 moles Cl₂(g) = 2(2.08 mole NaCl(s))

= 4.16 mole NaCl(g) = 4.16 mole NaCl(s) x 58 g NaCl(s)/mole NaCl(s) = 241.28 g NaCl(s)  

Answer:

25.6g de HF son producidos

Explanation:

...¿Cuánto HF es producido?

Para resolver este problema debemos convertir la masa de cada reactivo a moles usando su masa molar. Como la reacción es 1:1, el reactivo con menor número de moles es el reactivo limitante. Con las moles del reactivo limitante podemos obtener las moles de HF y su masa así:

Moles CaF2:

Masa molar:

1Ca = 40g/mol

2F = 19*2 = 38g/mol

40+38 = 78g/mol

50g CaF2 * (1mol/78g) = 0.641 moles CaF2

Moles H2SO4:

Masa molar:

2H = 2g/mol

1S = 32g/mol

4O = 64g/mol

98g/mol

100g H2SO4 * (1mol / 98g) = 1.02 moles H2SO4

Como las moles de CaF2 < Moles H2SO4: CaF2 es reactivo limitante.

Moles HF usando la reacción:

0.641 moles CaF2 * (2mol HF / 1mol CaF2) = 1.282 moles HF

Masa HF:

Masa molar:

1g/mol + 19g/mol = 20g/mol

1.282 moles HF * (20g/mol) =