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Weight of 1 mol sulphur = molar mass of sulphur = 32 g32 g = 1 mol3.2 g = 0.1 mol1 mol has 6.022*10^23 atoms0.1 mol will have 6.022*10^22 atoms

G.M.M= 6.022×10^23 molecules32g = 6.022×10^23 molecules32×12.044×10^25/ 6.022×10^23 = 12.044×10^236400g

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1 mole of a gas has 22.4 L of volume at STPTherefore, (22.4 L) of nitrogen gas at STP has 22.4/ 22.4 = 1mol

Now,

1 mole of N2has 6.022 x 1023molecules

Therefore, 1mol of N2has 1 x 6.022 x 1023= 6.022 x 10^23molecules.

And

1 molecule of N2has 2 atoms of N

Therefore, 6.022 x 10^23molecules of N2have 2 x 6.022 x 10^23=12.044 x 10^23atoms of N

i want in ntp

The number of atoms in 1 mole of any substance is 6.022× 10^23 atoms . This is according to Avogadro's law and it is referred to as Avogadro's number.Substances with equal moles will have the same the same number of atoms in them.

Moles = mass/ molar mass

i) Moles of 0.5 g nitrogen:

0.5/14= 0. 0357 moles

ii) moles of 12 C

molar mass of C = 12= 12/12= 1 mole

iii) Moles of 8 g oxygen

molar mass of O = 16

8/16 = 0.5 moles

iv) Moles of 24 g of Mg

Molar mass of Mg = 24

24/24 = 1 mole

NB: From the list given there is no element with same number of atoms as 0.5 g of Nitrogen. The question should have read 0.5 MOLES of Nitrogen - then the answer would have been 8g of oxygen

3. 8g of oxygen........

16 g i equal to 0.5 mole of oxygen molecule. we know in one molecule of oxygen there are 2 atom. Hence in 0.5 mole of oxygen molecule, there are 0.5 * 2 mole of atom of oxygen. that is 1 mole of oxygen atom.

Number of particle in one mole = 6.022 * 10^233.

Thu number of atom in 16 g of oxygen gas = 6.022*10^23

option 2 is correct.

Social problem: Already poor tribals gets affected the most, loss of land, livelihood, home, property etc.2. Not enough cash compensation offered by the government to the tribal groups, hence no source for balancing their livelihood.

Environmental problem: Ecosystem gets disturbed due to unannounced construction of dams.2.Rate of deposition of sediments of sediments gets reduced and rate of erosion remains constant hence resulting in reduced water tables, less deposition of sediments in deltas etc

Cannizarro's reaction is given by the compounds with no alpha-hydrogen. Hence, Acetaldehyde (see figure) will not give Cannizarro's reaction

E=hc/lwhere l.is wavelengthhenceE=6.626*10^-34*3*10^8/5700*10^-10E=19.878*10^-26/5700*10^-10E=0.0034*10^-16E=34*10^-20J

WE need to take 2 atomization of C+4 atomization of H+4 bond energy pf C-H1 heat formation of C2H4

2 x 171 + 4 x 52.1 - 4 x 99.3 - K = 12.5k= 140.7 Kcal

there are 5 double bond so there are 5 pi bonds and 12 sigma bonds

there are 5 pie bond and 12 sigma bond .because double bond is counted as pie bond

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there are 5 double bond so there are 5 pie bonds and 12 sigma bonds

There are 5 pie and 12 sigma bond

5 pie bond and 12 sigma bond

11.a)A state variable is one of the set of variables that are used to describe the mathematical "state" of a dynamical system. Intuitively, the state of a system describes enough about the system to determine its future behaviour in the absence of any external forces affecting the system.

b)Absolute temperature, also called thermodynamic temperature, is the temperature of an object on a scale where 0 is taken as absolute zero. Absolute temperature scales are Kelvin (degree units Celsius) and Rankine (degree units Fahrenheit). ... 0K (absolute zero) = - 273.15 Celsius.

12.a)Green chemistry, also called sustainable chemistry, is an area of chemistry and chemical engineering focused on the designing of products and processes that minimize the use and generation of hazardous substances

b)Eutrophication is the enrichment of an ecosystem with chemical nutrients, typically compounds containing nitrogen, phosphorus, or both.

SigmaAndPi Bonds. Asigma bondis a covalentbondwhich is formed by the head on overlap of two atomic orbitals. The combination of overlapping orbitals can be s-s, s-pzor pz-pz. ... But there can be a maximum of twopi bondsbetween two atoms in a molecule.

option C , it is weaker than sigma bond.

Inmechanical systems,resonanceis a phenomenon that occurs when thefrequencyat which aforceisperiodicallyapplied is equal or nearly equal to one of thenatural frequenciesof the system on which it acts. This causes the system tooscillatewith largeramplitudethan when the force is applied at other frequencies.

CH3COOH

H2SO4

a)Sigma And Pi Bonds. Asigma bondis a covalentbondwhich is formed by the head on overlap of two atomic orbitals. The combination of overlapping orbitals can be s-s, s-pzor pz-pz. ... But there can be a maximum of twopi bondsbetween two atoms in a molecule.

b)Pi bonds areusually weakerthan sigma bonds. Quantum mechanics says this is because the orbital paths are parallel so there is much less overlap between the p-orbitals.Pi bondshappen when two atomic orbitals are in contact through two areas of overlap.

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option 2

(PO4)3- has total -3 charge being delocalised on four oxygens, hence formal charge of oxygen = (-3/4) & P-O bond order = 1 + (1/4) = (5/4)

Resonance is the quality of sound being clear and loud.

One of the sp3 hybrid orbitals overlap with an sp3 hybridizedorbital fromcarbonto form the C-O sigma bond. Both the sets of lone pair electrons on the oxygen are contained in the remaining sp3 hybridized orbital. Due to the sp3 hybridization the oxygen has a tetrahedral geometry.

b is correct statement

The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system.

plzz give explanation

First is you need to know the number of valence electrons. You can do this by (1) drawing the electron configuration per element or (2) consulting your periodic table.

If you chose to draw the electron configuration per element, you will have something like this:

N(atomic number = 7) :1s22s22p3(5 outermost electrons)

O(atomic number = 8) :1s22s22p4(6 outermost electrons)

If you chose to consult your periodic table, just notice thatNbelong to Group 5A whileObelongs to Group 6A. The group number denotes the number of outermost electrons.Now that you know the number of valence electrons per element, you need to compute the total valence electrons for theNO-13ion.

5 + (3 x 6) = 23 electrons

But since the whole molecule has a -1 charge, you need to add this too. So thetotal number of valence electrons is 24.

The next thing to do is draw. Normally, the first element in the chemical formula is thecentral atom. In this case, theNatom is being surrounded by threeOatoms.

answer is -1

It's complicated

Reactions of amides:

Reaction of NaOH:

Amides are decomposed by NaOH to evolve ammonia. The gas can be tested by a moist red litmus paper which is then turned blue.

Alkaline hydrolysis of aromatic amides to aromatic acid:

The soluble sodium salt of aromatic acid formed from aromatic amides upon hydrolysis is regenerated as white precipitate in acidic medium.

Biuret Reaction for aliphatic diamide:

When aliphatic diamide is heated at a temperature above its melting point, ammonia is evolved and crystalline biuret is formed. This biuret in alkaline medium gives a violet colour with a drop of copper sulphate solution.

post the table photo too

question repeat please

Molecular weight of C6H12O6 is 180u

But we have to find it in grams.

Since 1u=1.66*10^-24

Therefore 180 u= 1.66*10^-24 *180 =3* 10 ^-22 gram

The answer is Option B.

1.00 molal aqueous solution means that 1 mol of solute is dissolved in 1 Kg of water.

Hence,No. Of moles of solute = 1

No. Of moles of water = 1000/18=55.556

MOLE FRACTION OF SOLUTE = No. Of moles of solute/no. Of moles of solute + No. Of moles of solvent

MOLE FRACTION = 1/1+55.556 =0.1768[0.0177(approx.)

Let mole fraction of gas is x we know, the relation between mole fraction and molalitymolality = x × 1000/(1 - x)M Here, M is Molecular weight of solvent . for aqueous solution , solvent is water . ∴ Molecular weight of water , M = 18g/mol

Now, 1 = x × 1000/(1 - x) × 18⇒18(1 - x) = 1000x ⇒18 = (1000 + 18)x ⇒x = 18/1018

Now, use formula , Relative lowering of vapor pressure = mole fraction of gas ∆P/P₀ = x Here P₀ is initial pressure ,at STP , P₀ = 760 torr so, ∆P = 760 × 18/1018 = 13.44 torr

Hence, lowering of vapor pressure = 13.44 torr

Molar mass of urea (NH2CONH2) = 2 (1 × 14 + 2 × 1) + 1 × 12 + 1 × 16= 60 g mol - 1

0.25 molar aqueous solution of urea means:1000 g of water contains 0.25 mol = (0.25 × 60)g of urea

= 15 g of urea

That is, (1000 + 15) g of solution contains 15 g of urea

Therefore, 2.5 kg (2500 g) of solution contains = (15 X 2500) / (1000+15) g

= 36.95 g

= 37 g of urea (approximately)

Hence, mass of urea required = 37 g

2.5 molal aqueous solution means 2.5 moles of solute in 1 kg solvent(water)

so, moles of solute=2.5

moles of water=1000/18=55.55(approx)

so mole fraction = 2.5/(2.5+55.55)=.043

on rounding off we see that option (c) is correct.

Formaldehyde or Methanal

Ethanol, also known as ethylalcoholand abbreviated as EtOH, is a colorless, volatile, and flammable liquid that is soluble in water. Its chemical formula is C2H6O, or can be written as C2H5OH or CH3CH2OH. It has one methyl (-CH3) group, one methylene (-CH2-) group, and one hydroxyl (-OH) group

If a small piece ofsodium is dropped intosomeethanol, it reacts steadily to give off bubbles of hydrogen gas and leaves a colourless solution ofsodiumethoxide, CH3CH2ONa.Sodiumethoxide is known as an alkoxide

options no c is the correct answer

the answer is c i hopr its correct

Dry ice, sometimes referred to as cardice, is thesolidform ofcarbon dioxide. It is used primarily as a cooling agent. Dry ice sublimates at 194.65 K (−78.5 °C; −109.3 °F), at Earth atmospheric pressures.

option a) Acetaldehyde

HOWEVER, “Phosgene,” actually IS the common name. Systematic name,Carbonyl chloride. Other names, which are common intermediates in the dye, pesticide, and pharmaceutical industries. The chemical first used at Ypres waschlorinegas, or phosgene.

Chlofloro carbon is your answer

Na+ is a positively charged sodium ion. Normally an atom of sodium has 11 electrons, so according to formula it has 2 electrons in K shell , 8 electrons in L shell and 1 electron in M shell. However Na+ has 10 electrons only, therefore it has 2 electrons in K shell and 8 in L shell. 2 and 8are the full capacity of the K and L shell respectively. Hence it is said ' Na+ has completely filled K and L shells. '