Ahydrologist from a government agency tests several samples of water for safety. as part of his examinations, he determines the concentration of lead that is present in each sample.

which method of expressing concentration should the hydrologist use to describe the concentration of lead in the water?

a) ppm or ppb

b) volume percent

c) mass-volume percent

d) mass percent

answer

the ions in solute supperate from eachouthere

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.