1.615 g of anhydrous `ZnSO_(4) `was left in moist air . After a few days its weight was 2.875 g .What is the molecular formula of hydrated salt ?

On dissolving 3.24g of sulphur in 40g of benzene, boiling point of solution was higher than that of benzene by 0.81K. K_b value for benzene is 2.53K kg mol^-1 . What is the molecular formula of sulphur? (Atomic mass of sulphur=32 g mol^-1) .

10g of non-volatile solute when dissolved in 100g of benzene raises its boiling point by 1^@ C. What is the molecular mass of the solute. ( k_b for benzene=2.53 K kg mol^-1 )

Lowering in vapour pressure is determined by Ostwald and Walker dynamic methed. It is based on the prinicipal , that when air is allowed to pass through a solvent or solution, it takes up solventvapour with it to get itself saturated at that temperature I and II are weighted separately before and after passing dry air. Loss in mass of each set, gives the lowing of vapour pressure. The temperature of air, the solution and the solvent is kept constant. Dry air was passed thorough 9.24 g of solute in 108 g of water and then through pure water. The loss in mass of solution was 3.2 g and that of pure water 0.08 g . The molecular mass (g/mol) of solute is nearly :

A gaseous compound is composed of 85.7% by mass carbon and 14.3% by mass hydrogen. Its density is 2.28 g/litre at 300 K and 1.0 atm pressure. Determine the molecular formula of the compound.

One gram of a metallic chloride was found to contain 0.835 g of chlorine. Its vapour density is 85.5.If its moleculars formula is M_(x) Cl_(y) ,then what is value of (x+y) ?

Find the molarity and molality of a 14% solution of H_(2) SO_(4) by weight. The density of the solution is 1.10 g/cc and the molecular mass of sulphuric acid is 98

A drop of water of mass 18xx10^-3 g falls away from the bottom of a charged conducting sphere of radius 20 cm, carrying with it a charge of 10^(-9)C and leaving on the sphere a uniformly distributed charge of 2.5xx10^(-6)C . What is the speed of the drop after it has fallen 30 cm? (4piepsi_(0))^(-1)=9xx10^(9)JmC^(-2)

A solenoid 60 cm long and of radius 4.0 cm has 3 layers of windings of 300 turns each. A 2.0 cm long wire of mass 2.5 g lies inside the solenoid (near its centre) normal to its axis, both the wire and the axis of the solenoid are in the horizontal plane. The wire is connected through two leads parallel to the axis of the solenoid to an external battery which supplies a current of 6.0 A in the wire. What value of current (with appropriate sense of circulation) in the windings of the solenoid can support the weight of the wire? g = 9.8 m s^-2 .

Ruby bought a watermelon weighting 5 kg 200 g.Out of this she gave 2 kg 750 g to her neighbour .What is the weight of the watermelon left with Ruby?

A 6.85g sample of the hydrated Sr(OH)_2.x H_2O is dried in an oven to given 3.13g of anhydrous sr(OH)_2. What is the value of x? (Atomic masses : Sr=87.60.O=16.0,H=1.0)