Chemistry, asked by krsaivarun, 6 months ago

II Two Marks Questions 1. What is density? Write the SI unit of
[M-171 IM-12 (M-14,16| [M-16) [F-181
density F-16, M-151

2 Define the tiny mole fraction. Write the equation to calculate the mole fraction of solute in solution.
F-147

3. What is a mole! Calculate number of moles in 49 g of HSC
Asamic mass of H-1,0-16,5-32)

4. Describe the classification af pure substances
F-171[F-14]

5. What is homogenous mixture? Give an example. [M-15]

6. Calculate the molarity of NaOH in the solution prepared by dissolving 4 grams of it in enough water tin form 250 ml of the solution (M-17]
7, Mention any two postulates of Dalton's atomic theory​

Answers

Answered by hanuhomecarepr72
1

1- Density is mass of unit volume of material substance.Formula of density is d= M/V ,,, where d= density

m= mass

v= volume

Density can be expressed as kilograms per cubic meter ( in mks) .

2- Mole fraction is also called amount fraction, identical to number fraction defined as number of molecules of constituents ni divided by total number of all molecules.....

also mole fraction is ratio of moles to moles.......

= Suppose, solution contains 2 components A and B then ,mole fraction of A and B will be Xa and Xb respectively.......then

= Xa= na /na+ nb

= Xb= nb/ na+ nb

also Xb = 1- xa.. ........

3- Mole is unit of measurement of amount of substance.A mole of substance are mole of particles exactly as 6.022*10^23 particles which can be atoms, molecules, ions ,or electrons.

In short, for particles mole = 6.022*10^23.......

no .of moles in 46 gm of HSC ;

= molar mass of HSC = 1+32+12

= 45.

now no .of moles= 45* 49

= 2205 no. of moles .........

4- attached image will help you ..

5- Homogeneous mixture have same proportions of it's components throughout any given sample .....

example of homogeneous mixtures are : sugar in water, salt in Water , sulphur in carbon disulphide.......etc ...

hopefully it will work.....

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