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 ?

In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass ). Molar mass of barium sulphate is .

Elements P and Q form two types of non-volatile, non-ionizable compounds PQ and . When 1 g of PQ is dissolved in 50 g of solvent ' A '. was 1.176 K while when 1 g of is dissolved in 50 g of solvent ' ...

An organic compound on treatment with aqueous ammonia under hot condition forms compound which on heating with and KOH forms compound (R) having molecular formula . Names of and R respectively are....

An organic compound "P" of molecular formula gives positive lodoform test but negative Tollen's test. When "P" is treated with dilute acid, it produces "Q". "Q" gives positive Tollen's test and also i...

Consider the following reaction sequenceThe percentage of nitrogen in product ' T ' formed is %. (Nearest integer)(Given molar mass in )...

14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K .Which of the following statements is incorrect?[Given : Molar mass in of ]

Elements P and Q form two types of non-volatile, non-ionizable compounds PQ and . When 1 g of PQ is dissolved in 50 g of solvent ' A '. was 1.176 K while when 1 g of is dissolved in 50 g of solvent ' ...