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Nitrogen is converted into NaCN, in lassaignes extract.

We assume100 gof compound. Therefore the acid contains39.9 g C;6.7 g H and53.4 g O.

Explanation:

We divide the percentage composition by theatomicmass of each constituent element:

39.9 g/12.011 g mol^−1= 3.32 mol

6.7 g/1.0794 g mol^−1= 6.65 mol

53.4 g/16.00 g mol^−1=3.34 mol

We divide thru by the lowest quotient(3.32)to getC:H:O≡1:2:1.

So the empirical formula isCH2O. And the empirical formula is the simplest whole number ratio that defines constituent atoms in a species.

The Gattermann reaction, (also known as the Gattermann formylation and the Gattermann salicylaldehyde synthesis) is a chemical reaction in which aromatic compounds are formylated by a mixture of hydrogen cyanide (HCN) and hydrogen chloride (HCl) in the presence of a Lewis acid catalyst such as AlCl3.

(D) is correct option

Option DThe Gattermann-Koch Reaction involves the formation of an arylaldehydeusingcarbon monoxideand hydrochloric acid as reactants.

Use the molecularformulaof the compound to calculate its molecularmassin grams permole. B Convert frommass to molesby dividing themassgiven by the compound's molarmass. C Convert frommolesto molecules by multiplying the number ofmolesby Avogadro's number.

This leads to thewatergetting evaporated as the temperatureishigh and in order to evaporate, thewater absorbs heat from the surface of the potor the surrounding, hence making it cooler.

This constant evaporation ofwaterkeeps the liquid inside thepot cool.

Electrochemical cells are basically of two types- Galvanic cells (also known as voltaic cell) and electrolytic cells. In galvanic cell, the chemical energy of a spontaneous redox reaction is converted into electrical energy while in electrolytic cells, electrical energy is used to carry out a non-spontaneous redox reaction. In other words, in Galvanic cells, chemical energy is converted into electrical energy, while in electrolytic cell electrical energy is converted into chemical energy.

Thus, electrolytic cell is a type of electrochemical cell.

Copper was the first metal discovered by man.

Explanation:The reason for this is that Copper can exist in nature in its native stage or pure form. Historical evidence for this has been found by archaeologists and the stone age was followed by the chalcolithic age.

Theelectrochemical equivalent, sometimes abbreviated Eq, of a chemical element is the mass of that element (in grams) transported by 1 coulomb of electricity.

The answer is option B

Mixture Krypton

rmix= 1.16rKr= 1

Mmix= ?MKr= 84

We know that

rmix/rKr= √MKr/Mminor 1.16/1 = √84/Mmix

or (1.16)284/Mmix=>Mmix= 84/(1.16)2= 62.426

Determination of the composition of the equilibrium mixture/Let the fraction of CI2molecules dissociated at equilibrium = x

CI2⇌ 2CI Total

Initially 1 0 1

At equilibrium 1 – x 2x 1 – x + 2x = 1 + x

∴ Total moles at equilibrium = 1 – x + 2x = 1 + 1

∵ Normal molecular mass/Experimental molecular mass = 1+x

∴ 71/64.426 = 1+ ∝

∴ ∝ = 0.137 =13.7%

Sodium perxenateoctahydrate, Na4XeO. 8H2O, is orthorhombic with cell constants a = 11.86, b = 10.36, c = 10.43 Å., space group Pbcn, Z = 4. A three-dimensional X-ray diffraction investigation has resulted in a completestructuredetermination.

Option (a) is the right answer

a is the right answer

option a is correct answer.

a is the right answer

h to get h at gf he j do fd

As we know that I.E is the minimum amount of energy required to remove an electron from the valence shell of an isolated gaseous atom in its ground state resulting in the formation of ion whereas, electron gain enthalpy is the amount of energy associated with the gain of electrons by the isolated gaseous atom.

So,it is opposite of I.E.

Hence,if I.E of Na=5.1 its Electron Gain enthalpy will be -5.1

Sodium chloride is formedwhensodiumatoms interact withchlorineatoms. When this occurs,sodiumwill donate an electron (which is a negatively-charged particle) tochlorine. This makessodiumslightly positive andchlorineslightly negative. ... So then,sodiumions will attractchlorideions andforman ionicbond

Barium carbonate decomposes most easily.Option (D) is correct.

BaCO3 the heaviest metal Ba as component as per given option giving the instability in lattice energy so decomposes easily

B) caco3

.........................

(c) 30 N atoms is wrong

you could think of it like this...1 Na(+) x (1 extra proton / 1 Na(+)) x (1.602x10^-19 coulombs / proton) = 1.602x10^-19 coulombs

N2O4(g) <==> 2NO2(g)10.0gT = 340KP = 1.00atm

Assuming we started with 10.0g of N2O4 and, 66% of it decomposed, that will leave 3.4g of N2O4, and make 6.6g of NO2. Convert those to moles, and then plug them into the ideal gas equation.

At equilibrium....3.4 g N2O4 .... 0.03696 mol N2O4 ...... carry extra sig figs for intermediate answersand6.6g NO2 ....... 0.1435 mol NO2

Total moles = 0.1805 moles of N2O4 and NO2, at a total pressure of 1.00 atm. Find the volume.

PV = nRTV = nRT / P = 0.1805 mol x 0.0821Latm/molK x 340K / 1.00 atm = 5.04L

You will get 5.02L if you use 0.18 moles of gas.

can you post question again please with accurate data

Formula unit mass: The formula unit mass of a substance is the sum of the atomic masses of all atoms in a formula unit of a compound. The term ‘formula unit’ is used for those substances which are made up of ions.Formula unit mass of ZnO = Atomic mass of zinc + atomic mass of oxygen= 65 + 16 = 81uFormula unit mass of Na2O = 2X 23 +16 =46 + 16 =62uFormula unit mass of K2CO3= 2X39 + 12 + 2X16 = 78 + 12 + 32 = 122 u

boring

option d is the correct answer.

Ans :- An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms.

Molarity = moles/litre

0.1 = X . 1000/1 ( converted into ml)

X = 10-4moles or 0.0001 moles

and we know that Ba(NO3)2dissociates into Ba2++ 2NO3-

the total no of ions = 3 in one mole

so in 10-4moles =

3 . 10-4. 6.023.1023

18 * 10 ^ -19

air is the mixture is the correct answer of the given question

air is the mixture not a compound

air is a mixture but not a compound

Air is the mixture of different type of gasses such as nitrogen , carbon dioxide , oxygen , etc...

Air is a mixture because it is a mixture of many gases such as nitrogen, carbon dioxide and oxygen.

1)all substance exist in any one from of matter2)they take up space and have mass3 )they are made of molecules and atoms4)they have a certain temperature5)they have melting ,boiling,freezing points

c...

You can see in the balanced reaction that the Ammonia and Oxygen required are in the ratio 4:5

Thus 4 moles of Ammonia requires 5 moles of oxygen.

4 NH3 ≈ 5O21 NH3 ≈ 1.25 O2

Now we have oxygen in less quantity as compared to Ammonia, thus Oxygen is the limiting reagent. So we balance to suit Oxygen.

4NH3 ≈ 5O20.8 NH3 ≈ 1 O2

Thus the reaction becomes0.8 NH3 + 1 O2 → 0.8 NO + 1.2 H2O

Thus all of the oxygen is used. 0.2 moles of NH3 are unused and we acquire 0.8 moles of NO and 1.2 moles of H2O.

option C is the answer.

Thetwo forms of oxygen foundin theatmosphereare: (i) Elementaloxygenis normallyfoundin the form of diatomic molecule (O2) in the lower part ofatmosphere. It is about 21% in the air and non-poisonous. (ii) Ozone isfoundin the stratophere part ofatmosphere. It contains three atoms ofoxygen(O3).

Quantitatively, ozone can be estimated with the help of potassium iodide. When ozone is made to react with potassium iodide solution buffered with a borate buffer (pH 9.2), iodine is liberated. This liberated iodine can be titrated against a standard solution of sodium thiosulphate using starch as an indicator.

Most glasses are made up of about 75% silicon dioxide, which is a metalloid. Glass fall short of the characteristic that qualify an element as a metal, which includes; malleable, good thermal and electricalconductivity, ductile andfusible. Glasses, however,haveother metals incorporated in the form of oxides such as Calcium oxide and sodium oxide.