Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Solve it, - A solution of sodium sulfate contins 92g of ions per kilogram of water.The molality of ions in th - Some basic concepts in chemistry - JEE Main

A solution of sodium sulfate contins 92g of Na^{+}  ions per kilogram of water.The molality of Na^{+} ions in that solution in mol\, \, kg^{-1} is:

  • Option 1)

    12

  • Option 2)

    4

  • Option 3)

    8

  • Option 4)

    16

Answers (1)

best_answer

 

Molality -

Molality (m) = (number of moles of solute)/(mass of solvent in kg)

 

- wherein

It is defined as the number of moles of solute present in 1 kg of solvent. It is denoted by m.

 

 

Molecular Formula -

The molecular formula shows the exact number of different types of atoms present in a molecule of a compound.

- wherein

For glucose, empirical formula is CH2O .its molar mass is 180 gram.

n = molar mass/empirical formula mass = 180/30=6

Hence molecular formula= C6H12O6

 

 

Mole Concept -

One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g (or 0.012 kg) of the 12C isotope.

- wherein

one mole = 6.0221367 X 1023   

as we know that no. of moles=\frac{mass}{molar mass}=\frac{94gram}{23gram/mol}=4mol

so, molality =\frac{moles}{weight of solution\left ( kg \right )}=\frac{4mol}{1}

n= 4 mol/kg

 

 


Option 1)

12

Option 2)

4

Option 3)

8

Option 4)

16

Posted by

admin

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2024 Topper: Farmer’s son Gajare Nilkrishna says ‘keep questioning until you understand’
anam-khan

NIT Puducherry Cut-off 2024: Computer Science and Engineering had highest closing rank last year
anam-khan

What after JEE Main results 2024? All you need to know about JEE Adv, CSAB, JoSAA counselling

Latest Question