A certain public water supply contains `0.10ppb` (part per billion) of chloroform `(CHCl_3)`. How many molecules of `CHCl_3` would be obtained in `0.478 mL` drop of this water ?(assumed `d=1g per mL`)

A sample of municipal water contains one part of urea (molecular wt = 60) per million parts of water by weight. The number of urea molecules in a drop of water of volume 0.05ml is

How many litres of _2 at STP will be formed when 100 ml of 0.1 M, H_2S)_4 reacts with excess of Na_2CO_3 ?

Urine normally has a pH of 6.0 . A patient eliminates 1.3 litres of uring per day . How many moles of H^(+) ions does he eliminate in a day ?

Natural abundance of heavy water in water is 1: 6000 . How many heavy water molecules are present in one drop of water ? (one mL water is 20 drops)

At a certain temperature the equilibrium constant K_c is 0.25 for the reaction A_(2(g))+B_(2(g)) harr C_(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)) ?

Oridinary water contain one part of heavy water per 6000 parts of water by weight. The number of heavy water molecules present in a drop of water of volume 0.01 mL is (density of water 1 g/mL)