Mole Concept Questions

A 5.2 molal aqueous solution of methyl alcohol, CH3OH , is supplied. What is the mole fraction of methyl alcohol in the solution ?

For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of sulphuric acid. The unreacted acid required 20 mL of sodiu...

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecule is

When 22.4 litres of H2(g) is mixed with 11.2 liters of Cl2 (g), each at STP, the moles of HCl(g) formed is equal to

1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24; O = 16)

In the Kjeldahl′s method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is...

The boiling point of 0.2 mol kg-1 solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case ?...

The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 × 10-12, 1.8 × 10-10,. 5.0 × 10-13, 8.3 × 10-17. Which one of the following salts will precipitate last if AgNO3 soluti...

Which of the following is dependent on temperature?

Consider the molecules CH4,NH3 and H2O. Which of the given statements is false?

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escape in the time required for one-half of the hydrogen t...

Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms ?

6.02 × 1020 molecules of urea are present in 100 ml of its solution. The concentration of solution is :-

The molarity of a solution obtained by mixing750 mL of 0.5(M) HCl with 250 mL of 2(M) HCl will be :-

The density of a solution prepared by dissolving 120 g of urea (mol. mass = 60 u) in 1000 g of water is 1.15 g/mL. The molarity of this solution is :-

Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solution is

Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25oC are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl3 and 40 g of CH2...

In Duma′s method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the ...

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