What will be the molarity of a solution of glucose in water which is 10 w/w

Devanshi patkr 2020-07-31 09:18:41

Thx for helping me 😊

Sonali 2019-07-07 19:25:07

1000/90 can be written as 0.09

Sonali 2019-07-07 19:24:27

1000/90 can be written as 0.09

Nazish 2019-06-08 14:08:32

Why 19 was divided by 18.instead of 180

Amarjeet 2019-05-24 18:24:18

From where 0.9 is there

Viku 2019-05-20 21:46:16

0.9 kha s aaya h

Monika 2019-03-30 10:58:22

When we get 0.01

Abab 2019-03-17 15:47:16

Hey

Aksh 2019-01-06 19:35:58

What if density is not given

Surendra singh kohli 2018-04-25 20:52:10

Very interesting question

Page 2

Ravi 2019-08-05 22:59:05

Easy understanding method nice. Diaper for difficult questions..

Krysta 2019-05-30 07:42:44

Perfect 👍

Kunalsharma 2019-05-03 16:45:08

Good but it can be done in short also😍

Uttam 2019-04-21 21:11:30

Thanks

Uttam 2019-04-21 21:11:10

Thanks

Vikas 2019-04-20 23:37:02

Thanks

Girjesh kumar 2019-04-11 08:29:19

Very nice.

KRISHAN KUMAR 2019-04-11 05:34:49

Hmm thank you. But still.........

Facebook 2019-03-30 18:12:53

You are help me to solve this prnblem so thank you for it

Mukesh Kumar 2019-03-11 22:01:33

Thanks

Page 3

Shriniwas Kshirsagar 2020-09-04 16:57:04

Thnx sir

Viku 2019-05-20 22:11:20

But finally percentage is 64.5%

Sanyam jain 2019-04-30 22:44:01

Please correct that Percentage of H2O in final solution is 66.5 % not 65.5 %

Sanyam jain 2019-04-30 22:43:23

Please correct that Percentage of H2O in final solution is 66.5 % not 65.5 %

Sumbul 2019-04-29 22:25:24

Thanks

siddharth 2019-04-26 06:08:51

thnx sir

preeti mahato 2019-04-23 21:16:10

Thanks sir for this answer, this answer will help me a lot

Mayank 2019-04-17 09:04:29

Thanks

Annu 2019-04-14 11:42:59

If percentage composition in terms of mass is asked

Annu 2019-04-14 11:42:33

If percentage composition in terms of mass is asked

Page 4

Rakshita 2019-03-14 21:01:50

Y we shouldn't consider the moles of water as we had considered of solute in calculating of total solvent?

Aynal Hoque 2018-10-22 10:36:17

Yup it's correct bcs we should always consider the no.of moles....which is more for water here....hence water is solvent...and in las molality can be directly calculated from molarity as molality= 1000 M/1000d-MM' (M = molarity and M'= molar mass of solute)

Kane 2018-07-01 19:02:37

Ethylene glycol is solute because it has less no. Of moles in the solution in comparison to water.

Abhi 2018-06-23 16:46:45

Why ethylene glycol is solute

Pankaj 2017-05-04 16:58:56

Why ethylene glycol is solute here even it is more quantity

Page 5

papa g 2019-08-07 21:16:13

good

papa g 2019-08-07 21:15:16

super

jasmeen 2019-06-09 12:46:58

very much helpful

jasmeen 2019-06-09 12:44:40

thanks

shanawaz 2019-05-12 12:45:53

thanks all

RishAbh 2019-04-14 06:56:34

Y u haven't considered the weight of solvent in second part as (10^6-15) grams?

Tarun raghav 2018-06-14 23:46:29

Sukriya

Page 6

Rohit Chalotra 2019-08-04 10:33:25

Thanks sergeant

hema 2019-07-23 03:19:55

Thank you very much sir

Kriti 2019-04-16 13:47:07

Thanks for your help

Kriti 2019-04-16 13:46:44

Thanks for your help

Assss 2019-03-28 18:48:32

Your answer is wrong. As molecular mass increase solubility of a gas increases.

varshan 2019-03-18 20:01:38

Thanks

SG 2019-02-06 19:24:27

see ncert pg no. 45 last para for increased or decreased vapour pressure confusion.

Prince Sekhon 2018-06-21 17:58:01

Perfect ans

Raveena gupta 2018-05-08 02:12:14

Thanks

Some dude 2018-04-05 01:15:59

Fukin wrong pleb Interactions get stronger leading to stronger bonds and less vapour and hence less vapour pressure causing the negative deviation from Raoults law

Page 7

RISHIKESH SAHIL 2019-08-18 23:20:57

Superb

Lata 2019-07-01 19:46:49

Easy to understand

Page 8

Pamit pal 2019-12-11 00:12:12

OK sir

Pamit pal 2019-12-11 00:11:36

Ok

Pamit pal 2019-12-11 00:10:54

Ok

Akash sonar 2019-11-22 21:27:21

Thanks a lot

Abhishek malviya 2019-08-16 19:46:08

Mst and easily explained

Prince 2019-05-03 16:07:21

Tq ...easy explanation

Souviks 2019-01-14 20:18:36

Ok

Jyotirmayee das 2018-08-16 06:51:57

So helpful

Ayush pandet 2018-07-24 12:57:38

Sir what will be the effect on solubility if we increase in temperature.

Aleena 2018-07-23 20:45:06

Easy to study

Page 9

Ayush Pathak 2019-05-09 10:56:59

Hey frnds this ans is correct but this is not the correct way to solve. To solve this make two equation taking no. Of moles of other component in solution as n and Henry's constant as k and partial pressure of ethane in second solution as x .While solving both equations Henry's constant and no. Of moles of other component get cancelled and u get x which is required ans.

Ghf 2019-05-01 13:17:26

Will you explain it in a more elaborate way?

neha 2019-04-24 11:05:05

p pressure is directly proportional to mole fraction of gas then how it becomes mass??? can anybody explain???

Anonymous 2019-04-17 11:38:58

Partial pressure is directly proportional to the mass of the gas

Nishi 2019-03-10 12:15:10

P=Kh*x....where x is mole fraction then how we can replace it by mass?.... 😐😐

Diya 2019-02-12 15:42:05

Isn't it kh*m=p. They have given it in the opposite way

Aynal Hoque 2018-10-22 11:07:40

I could not undrstnd that Henry\'s law states that partial pressure in vapour phase is directly proportinal to mole fraction ,then how Can it be apply directly to the given mass by replacing the mole fraction..? That is done here

Xxx 2018-05-11 07:47:57

Can we solve it with pie = CRT?

Page 10

Answer

Raoult’s law states that at a given temperature, the vapour pressure of a solution containing non volatile solute is directly proportional the mole fraction of the solvent.

Non ideal solutions shows positive & negative deviations from ideal behavoiur.

Non ideal solutions showing  positive deviations from Raoult’s law- Consider a binary solution of two components A & B .If the A-B interaction in the solutions are weaker than A-A & B-B interactions in the two liquids forming the solution,then the escaping tendency of A & B  types of molecules from the solution becomes more than from pure liquids.

As a result ,each component of solution has a partial vapour pressure greater than expected on the basis of Raoult’s law.This is called positive deviations from Raoult’s law,i.e PA> PA °xA  & PB >PB°xB

ΔmixH is positive because energy is required to  break A-A & B-B attractive forces.Hence endothermic process.

Non ideal solutions showing  Negative  deviations from Raoult’s law- in such solutions,the A-B interactions are stronger than A-A & B-B interactions .Due to stronger A-B interactions ,the escaping tendency of A & B types of molecules from the solution becomes less than from pure liquids. Consequently, each component of the solution has a  partial vapour  pressure  less than expected on the basis of Raoults law. This is called negative deviations form Raoults law,i.e PA< PA °xA  & PB B°xB

ΔmixH is negative because energy is released due to increase in attractive forces. Hence exothermic process.

Royal govind 2020-07-21 19:59:34

Sir gajab solution hai sir yee ans commplicateded hai

kshama pandey 2019-04-21 22:29:22

Thankyou sooo much

kshama pandey 2019-04-21 22:28:29

thankyou so much

Page 11

Reena Roy 2019-07-18 16:08:54

Very helpful

Anupama 2019-07-06 17:49:54

In the question,it's only given as a solvent.Why did u take it as water?

Veer Pratap Singh Laungwal 2019-05-30 10:16:09

Thank you so much very informative

Satya prakash satapathy 2019-05-26 08:25:27

Thanks

Pooja 2019-05-22 01:01:14

Thx

Arushi 2019-05-05 20:41:39

Thanks

pratap 2019-05-05 08:52:22

isme vapour presure water ka to diya hi na h

Kr shiddartha 2019-04-23 22:24:47

Thanks

Prashant 2019-04-21 11:36:46

Thanks

Mayank 2019-04-02 20:40:40

Thank u so much for this help and God bless you

Page 12

Nayan M J 2019-06-26 18:22:24

It was a suitable answer

Fucker 2019-05-15 10:44:32

There is a mistake for finding partial pressure. It should have been written Pa = xap°a

Aakarshan 2019-04-24 19:37:56

The yellow background soothes me.

chutiya 2019-04-22 17:19:50

dhanywad

Procrastinator 2019-03-12 01:11:32

God bless ur soul

Shivam Yadav 2019-03-09 14:41:41

Wow thanks

Alfin 2019-03-01 09:58:20

p1 = x2 p20??

Samoon karamat 2018-05-30 11:12:01

Thanks for this help ....best &simple solution

Rama 2017-10-17 12:07:26

Thanks for this help Best site!!!!!!

Page 13

2019-05-31 13:54:09

, mind-blowing

Ridham Rana 2019-05-28 10:44:24

Thank you for help SaralStudy.

Bhadawar 2019-04-04 20:46:15

Thanx for help

Page 14

Pankaj 2019-05-24 11:24:16

Give the complete & correct solution, immediately

Tanya 2019-05-04 12:11:11

This solution is quite easy but this is not correct. The correct answer for this question is 10.

Tanya 2019-05-04 12:09:55

This is quite easy but correct answer is 10

Bhagya 2019-04-25 10:54:30

For the answer to be 10 , it should be equated with X of solute i.e. ((w1/M1)/(w1/M1)+(w2/M2))

Gautam 2019-04-22 22:21:37

Correct is 10

Neha 2019-03-28 23:44:30

But answer is 10

Neha 2019-03-28 23:43:03

Give the correct solution

Renuka 2019-03-10 23:58:19

Answer is right

Malavika Manish 2019-03-09 15:07:11

The answer is wrong ....the correct answer should be done like given below if vapour pressure of pure liquid is = Po 80 % of pure liquid Ps= 80×Po/100 = 0.8Po Ps =Po × Xsolute mass of solute = x gram mass of solvent = 114g Molar mass of solute= 40 g/mol Molar mass of solvent (octane C8H18) = 114g/mol Number of moles of solute = x/40 = 0.025x Number of moles of solvent = 114/114= 1 moles Mole fraction of solvent = 1/(1+0.025x) 0.8Po=Po×1/(1+0.025x) Cross multiply we get (1+0.025x))0.8Po= Po Divide by 0.8 Po we get 1+0.025x = 1.25 Subtract 1 both side we get 0.025x = 0.25 Now divide by 0.025 we get x = 10g

nikhil gupta 2019-01-17 15:37:35

this answer in wrong instead the formula used will be p-ps/ps

Page 15

Answer

Let, the molar mass of the solute be M g mol - 1

Now, the no. of moles of solvent (water),n1 = 90g / 18g mol-1

And, the no. of moles of solute,n2 = 30g / M mol-1 = 30 / M mol

p1 = 2.8 kPa

Applying the relation:

(p10 - p1) / p10    =  n2 / (n1  + n2)

⇒ (p10 - 2.8) / p10    =  (30/M)  / {5  + (30/M)}

⇒ 1 - (2.8/p10)  = (30/M) / {(5M+30)/M}

⇒ 1 - (2.8/p10) = 30 / (5M + 30)

⇒ 2.8/p10  = 1 -  30 / (5M + 30)

⇒ 2.8/p10   =  (5M + 30 - 30) / (5M + 30)

⇒ 2.8/p10   = 5M / (5M+30)

⇒ p10 / 2.8  =  (5M+30) / 5M  ----------------(1)

After the addition of 18 g of water:

n1 = (90+18g) / 18  = 6 mol

and the new vapour pressure is p1 = 2.9 kPa   (Given)

Again, applying the relation:

(p10 - p1) / p10    =  n2 / (n1  + n2)

⇒ (p10 - 2.9) / p10    =  (30/M)  / {6  + (30/M)}

⇒ 1 - (2.9/p10)  = (30/M) / {(6M+30)/M}

⇒ 1 - (2.9/p10) = 30 / (6M + 30)

⇒ 2.9/p10  = 1 -  30 / (6M + 30)

⇒ 2.9/p10   =  (6M + 30 - 30) / (6M + 30)

⇒ 2.9/p10   = 6M / (6M+30)

⇒ p10 / 2.9  =  (6M+30) / 6M  ----------------(2)

Dividing equation (1) by (2),we get:

2.9 / 2.8 =   {(5M+30) / 5M} / {(6M+30) / 6M}

⇒ 2.9 x (6M+30 / 6)  =  (5M+30 / 5) x 2.8

⇒ 2.9 x (6M +30) x 5 = (5M+30) x 2.8 x 6

⇒ 87M + 435  =  84M + 504

⇒ 3M = 69

⇒ M = 23u

Therefore, the molar mass of the solute is 23 g mol - 1.

(ii) Putting the value of 'M' in equation (i), we get:

⇒ p10 / 2.8  =  (5M+30) / 5M 

⇒ p10 / 2.8  =  (5x23+30) / 5x23

⇒  p10  =  (145 x 2.8) / 115

⇒  p10  =  3.53

Hence, the vapour pressure of water at 298 K is 3.53 kPa.

Why 2019-07-26 16:11:20

Thank you so much..it really helped me a lot

Meraj alam 2019-07-03 16:21:02

Why are you adding 1 in p°-p/p° ??

Best explaination 2019-05-23 15:42:29

Nice

akash 2019-03-25 18:20:34

the ways u define or tell really good .. rock on pleaze

Arsh 2019-02-19 22:14:50

Really good

Page 16

Twinkle 2020-07-17 18:47:48

Taugh but it makes it easy

Vivek 2019-11-27 11:24:58

Nice answer

Krypton 2019-09-09 13:01:10

Perfect answer

Abhinav priye 2019-04-06 14:09:29

Very good 👍👍👍👍👌👌👌 Keep it up

Allin 2018-11-20 14:55:45

Kf for water and sugar cane will be same for kf of water and glucose

Soumyanetra Basak 2018-07-27 21:32:07

Good way

Prince Godwami 2018-06-10 12:13:31

Perfect answer.

Vishal singh 2018-06-05 21:12:53

Awesome

Page 17

Baba Kareem Das 2018-03-11 20:23:28

I Like this solutions

Satvir singh 2017-05-12 13:20:52

In this question we are calculating the molecular mass of AB2 and AB4 molecule separately,therefore in case molecular mass of AB2 is taken and in other case molecular mass of AB4 is taken

Pinky 2017-05-11 11:28:54

in molality we take the molecular mass of solution in denominator but here there is only molecular mass of compound AB2.Why?

Page 18

Nevil 2019-08-24 14:40:33

Nyc

Uzair shaikh 2019-06-09 15:29:16

C1=mole/volume=weight/molecular weight × 1/volume = 36/180 × 1/1

manisha 2019-05-28 13:09:30

what is the meaning of writing C1= 36/180 but its real value is 36g

Khushi 2019-05-15 22:23:19

How can write 36/180

Obd 2019-05-14 21:29:20

Sir its 0.061

RAUSHAN KUMAR 2019-04-10 20:42:28

How write 36/180

Chandan Sharma 2018-09-17 09:11:30

Sorry... The answer of this question is... 0.06 not 0.006

Page 19

2019-05-12 20:32:12

Thanks

Page 20

Answer

n-octane is an organic solvent (liquid)

Out of given examples cyclohexane is strongest organic solvent, so according to like dissolves like, cyclohexane is most likely to be dissolved as a solute in n octane. After cyclohexane, CH3CN

Will be dissolved completely as a solute in n octane, then CH3OH & the least soluble will be Kcl. Also since n-octane & cyclohexane, both of them belongs to alkane category, their solubility will be maximum.

Therefore the order of increasing solubility in n octane is as follows:

Kcl < CH3OH < CH3CN < Cyclohexane

Candygirl 2019-07-04 20:44:21

What is right??

Chandan Sharma 2018-09-17 09:08:40

The answer of this question (q. N. 23) is wrong..... Because CH3OH is less than CH3CN.... So order Will be like this... Cyclohexan> CH3OH>CH3CN>KCl

Page 21

Farhan khan 2019-09-28 00:39:14

Explain briefly

Page 22

Shyam Sunder 2019-03-27 18:54:52

why density is mentioned?

Page 23

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Question 27

Answer

Solubility product of CuS, Ksp of CuS = 6 x 10-16

If s is the solubility,

then CuS = cu2+ + S2-

Therefore KSP = { cu2+}{ S2-}

Or

KSP = s x s

Or

s = √ KSP = √6 x 10-16

= 2.45 x 10-8 M

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