Grade 10Mechanics

200 ml of h202 having volume strength 22.7 is mixed with 800 ml h2o2 solution having volume strength 45.4 are mixed together. the density of final h2o2 solution is 1.0224 g/ml
find
1. final volume strength
2. molality of final solution
3. w/v % of final solution

SAMBHAV MISHRA

7 Years agoGrade 10

2 Answers

Nikhil

Approved Tutor Answer7 Years ago

H2o2 ------ H20 + ½ O2

volume strength of hydrogen peroxide is defined as amount of oxygen that can be produced by 1 litre of it...

Acc. New sign conventions 1mole gas = 22.7 ltr at STP

So Molarity of first sample is 2M and that of 2^nd is 4M

so moles of h2o2 in 1^st sample is 0.4 and in 2^nd it is 4*800/1000 =3.2

after mixing voluume of final soln is1 ltr and total moles =3.6 this is also molarity

so volume str = (3.6/2)*22.7 = 40.86 ltr (1.)

w/v% = weight of solute(h2o2)/volume of solution *100

=3.6*34(molarmass of h2o2)/1000 *100

=12.24% (3.)

molality = moles of solute/weight of solvent in kg

Now weight of soln = density *volume = 1.0224*1000 =1022.4 gm

weight of h202 = 3.6*34= 122.4 gm

so weight of solvent = 1022.4-122.4 =900gm

= 3.6/ 0.9 =4 (2.)

SAMBHAV MISHRA

7 Years ago

@nikhil thank you very much bro.. god bless you..................................u r doig a nice job

keep it up...

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200 ml of h202 having volume strength 22.7 is mixed with 800 ml h2o2 solution having volume strength 45.4 are mixed together. the density of final h2o2 solution is 1.0224 g/mlfind 1. final volume strength 2. molality of final solution3. w/v % of final solution

SAMBHAV MISHRA

2 Answers

Nikhil

SAMBHAV MISHRA

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200 ml of h202 having volume strength 22.7 is mixed with 800 ml h2o2 solution having volume strength 45.4 are mixed together. the density of final h2o2 solution is 1.0224 g/ml
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1. final volume strength
2. molality of final solution
3. w/v % of final solution

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