A sample of drinking water was found to be severly containated with chloroform,` CHCl_(3)` level of contamination was 15 ppm (by mass) Determine the molarity of chloroform in the water sample.

A sample of drinking water was found to be severely contaminated with chloroform (CHC13) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass): determine the molality of chloroform in the water sample.

A small quantity of solution containing Na^24 radio nuclide (half-life=15 h) of activity 1.0 microcurie is injected into the blood of a person. A sample of the blood of volume 1cm^3 taken after 5h shows an activity of 296 disintegrations per minute. Determine the total volume of the blood in the body of the person. Assume that the radioactive solution mixes uniformly in the blood of person. ( 1 curie =3.7 xx 10^10 disintegrations per second)

If hardness of water sample is 200 parts per million , Calculate the mass ratio of CaCO3 to water is:

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 )

A sample of pure sodium carbonate 0.318g is dissolved in water and titrated with HCl solution. A volume of 60mL is required to reach the methyl orange end point. Calculate the molarity of the acid.

MnO_(2) on ignition converts into Mn_(3)O_(4) . A sample of pyrolusite having 75% MnO_(2) , 20% inert impurities and rest water is ignited in air to constant mass. What is the percentage of Mn in the ignited sample ?

A sample of 16 g charcoal was brought into contact with CH_(4) gas contained in a vessel of 1 litre at 27^(@) C . The pressure of gas was found to fall from 760 to 608 torr. The density of chacoal sample is 1.6 g//m^(3) . What is the volume of the CH_(4) gas adsorbed per gram of the adsorbent at 608 torr and 27^(@)C ? 125 L//g , 16.25 mL//g , 26 mL//g , none of these .

The concentration of bivalent lead ions in sample of polluted water that also contains nitrate ions is determined by adding solid sodium sulphate (m=142) to exacty 500mL water 500mL water. Calculate the molarity of kead ion if 0.355g of solium sulphate was needed for complete precipitation of lead ions as sulphate.

A 1.0g sample of a pure organic compound cotaining chlorine is fused with Na_(2)O_(2) to convert chlorine to NaCl. The sample is then dissolved in water, and the chloride precipitated with AgNO_(3) , giving 1.96 g of AgCl. If the molecular mass of organic compound is 147, how many chlorine does each molecule contain ?

Two narrow bores of diameters 3.0 mm and 6.0 mm are joined together to form a U-tube open at both ends. If the U-tube contains water, what is the difference in its levels in the two limbs of the tube ? Surface tension of water at the temperature of the experiment is 7.3xx 10^-2 N m^-1 '. Take the angle of contact to be zero and density of water to be 1.0xx 10^3 kg m^- 3 ( g = 9.8 m s^-2 ) .