A certain public water supply contains `0.10ppb` (part per billion) of chloroform `(CHCI_3)`. How many molecules of `CHCI_3` would be obtained in `0.478 mL` drop of this water ?(assumed `d=1g/mL`)

AI_2(SO_4)_3 solution of 1 molal concentration is present in 1 litre solution of density 2.684 g/ml . How many moles of BaSO_4 would be precipitated on adding excess of BaCI_2 in it ?

Calculate the molality and mole fraction of the solute in aqueous solution containing 3.0 g urea per 250 g of water (molecular mass of urea = 60g).

At a certain temperature the equilibrium constant K_(c) is 0.25 for the reaction A_(2)(g)+B_(2)(g)hArrC_(2)(g)+D_(2)(g) If we take 1 mole of each of the four gases in a 10 litre container ,what would be equilibrium concentration of A_(2) (g)?

A_(2)B molecules (" molar mass " = 259.8 g//"ml") crystallises in a hexagonal lattice as shown in figure .The lattic constants were a=5 Å and b=8 Å . If denstiy of crystal is 5 g//cm^(3) then how many molecules are contained in given unit cell ? (" Use" N_(A) = 6xx10^(23))

The freezing point of a solution containing 0.1g of K_3[Fe(CN)_6] in 100 g of water. (K_f=1.86 K kg mol^-1) is

A high altitude balloon contains 6.81 g of helium in 1.16xx10^(4)" L at"-23^(@)C. Assuming ideal gas behaviour, how many grams of helium would have to be added to increase the pressure to 4.0xx10^(-3) atm?

A balloon contains 14.0 L of air at 760 torr. What will be the volume of the balloon when it is taken to a depth of 10 ft. in a swimming pool? Assume that the temperature of the air and water are equal. (density : Hg=13.6g/mL.)

In a coagulation experiment, 5 mL of As_2S_3 is mixed with distilled water and 0.1M solution of an electrolyte AB so that total volume is 10 mL. It was found that all solutions containing more than 4.6 mL of AB coagulate within 5 minutes. What is the flocculation value of AB for As_2S_3 sol. ?

A compressed cylinder of gas contains 1.50xx10^(3) g of N_(2) gas at a pressure of 2.0xx10^(7) Pa and a temperature of 17.1^(@)C . What volume of gas has been released into the atmosphere if the final pressure in the cylinder is 1.80xx10^(5) Pa ? Assume ideal behaviour and that the gas temperature is unchanged.

How many mL of 0.1 M HCl are required to react completely with 1 g mixture of Na2CO3 and NaHCO3 containing equimolar amounts of both?