English

Define molality.

Advertisements
Advertisements

Questions

Define molality.

Define the following term:

Molality

Definition
Advertisements

Solution

Molality (m) is defined as the number of moles of the solute dissolved in one kilogram (kg) of the solvent. The units of molality are moles per kilogram, i.e., mole kg−1. The molality is preferred over molarity if the volume of the solution is either expanding or contracting with temperature.

Molality (m) = `"Number of mole of solute"/"Mass of solvent (in kg)"`

shaalaa.com
  Is there an error in this question or solution?
Chapter 1: Solutions - REVIEW EXERCISES [Page 66]

APPEARS IN

Nootan Chemistry [English] Class 12 ISC
Chapter 1 Solutions
REVIEW EXERCISES | Q 2.1. ii. | Page 66
Samacheer Kalvi Chemistry - Volume 1 and 2 [English] Class 11 TN Board
Chapter 9 Solutions
Evaluation | Q II. 1. (i) | Page 64
NCERT Chemistry Part 1 and 2 [English] Class 12
Chapter 1 Solutions
Exercises | Q 1.3 (ii) | Page 27
Nootan Chemistry [English] Class 12 ISC
Chapter 1 Solutions
SHORT ANSWER TYPE QUESTIONS | Q 5. (ii) | Page 110
Nootan Chemistry [English] Class 12 ISC
Chapter 1 Solutions
'NCERT TEXT-BOOK' Exercises | Q 2.3. (ii) | Page 123

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

Why is molality of a solution independent of temperature?


Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.


Calculate the molarity of the following solution:

30 g of Co(NO3)2 . 6H2O in 4.3 L of solution.


Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution.


Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL−1?


A solution is obtained by mixing 300 g of 25% solution and 400 g of 40% solution by mass. Calculate the mass percentage of the resulting solution.


If the solubility product of CuS is 6 × 10−16, calculate the maximum molarity of CuS in aqueous solution.


22.22 gram of urea was dissolved in 300 grams of water. Calculate the number of moles of urea and molality of the urea solution.

(Given: Molar mass of urea = 60 gram mol−1)


Define Normality.


A sample of 12 M Concentrated hydrochloric acid has a density 1.2 M gL-1 calculate the molality.


The sum of all mole fraction for a mixture is always equal to ____________.


When a solute is present in trace quantities the following expression is used:


Molarity of liquid HCl will be if the density of the solution is 1.17 gm/cc.


The molarity of the solution containing 7.1 g of Na2SO4 in 100 ml of aqueous solution is ____________.


The molarity of pure water is ____________.


On adding a solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is:


2.5 litres of NaCl solution contain 5 moles of the solute. What is the molarity?


Mole fraction of the solute in a 1.00 molal aqueous solution is ____________.


What is the normality of a 1 M solution of H3PO4?


The volume of 4 N HCl and 10 N HCl required to make 1 litre of 6 N HCl are ____________.


200 ml of water is added to 500 ml of 0.2 M solution. What is the molarity of this diluted solution?


For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be:


If N/10 50 ml H2SO4, N/3 30 ml HNO3, N/2 10 ml HCl is mixed and solution is made to 1 L. Then normality of the resultant solution is:


Which of the following concentration terms is/are independent of temperature?


A solution is prepared by dissolving 10 g NaOH in 1250 mL of a solvent of density 0.8 mL/g. The molality of the solution in mol kg–1 is:


Which of the following units is useful in relating concentration of solution with its vapour pressure?


Which of the following concentration unit is independent of temperature?


Mole fraction of C3H5(OH)3 in a solution of 36 g of water and 46 g of glycerine is ______.


Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are:


What is the mole fraction of solute in 1.00 m aqueous solutions?


Which of the following is a correct statement for C2H5Br?


Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?

w/w (mass percentage)


Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?

x (mole fraction)


Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?

m (Molality)


The concentration of water molecules in pure water at 298 K is?


Carbon percentage (by weight) in crude petroleum may be about


What is the ratio of mass of an electron to the mass of a proton?


The number of electrons involved in the reduction of one nitrate ion to hydrazine is


What is the normality of 0.3 m H3Pcl solution?


138 g ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is ______.


4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x × 10−1. The value of x is ______. (Rounded-off to the nearest integer)


A sample of Ferrous sulphide reacts with dil. H2SO4 to from H2S which contains 9% hydrogen by volume. The percentage of fee in the sample, is ______.


The mole fraction of a solute in a 100 molal aqueous solution is ______ × 10-2. (Round off to the Nearest Integer).

[Given :Atomic masses : H : 1.0 u, O : 16.0 u]


4 ml of pure A (d = 2.45 gm/ml) was added to 46 ml of B (d = `25.1/23` gm/ml), the molarity of a solution of A in B will be ______, if the density of the final solution is 1.8 gm/ml.

Given: Molar mass of A = 98, Molar mass of B = 46


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×