Fair warning. Many of us, me in particular, shy away from posts containing more than one question. It takes too long to answer a single question and some of us have just time enough some times to knock off one small question. In this case the answers were quick and I did them all but I suggest that you limit posts to one question in the future. So you post multiple times; if that is so please use the same screen name. It helps us keep the questions straight. We don't mind multiple posts by the same person.
1 ppm = (g solute/g solvent) x 1E6
1 ppm = (g PCB/g solvent) x 1E6
4 ppm = (g PCB/64,000 g) x 1E6
Solve for g PCB. You can look in your references as to the toxic effects of this amount.
Find mols NaNO3 = grams/molar mass
Then M = mols/1.5 L
NH3.
M = mols/L
1.24 = 0.5/L
Solve for L of 1.24 M needed for a 0.5 mol.
H2SO4.
c1v1 = c2v2
17.8*v1 = 0.200 x 2
solve for v1 in L.
if the average concentration of PCBs in the body tissue of a human is 4.0 ppm, what mass of the PCB is present in a 64 kg person? is this a significant amount in regards to the health of the person?
What is the concentration of a solution of sodium nitrate that contains 35.0 g of the solute in a 1.5 L solution?
A typical household ammonia solution has a concentration o 1.24 M. What volume of this solution would contain .500 mol of NH3? What volume of this solution would contain 10.0 g of NH3?
What volume of concentrated 17.8 M sulfuric acid would a laboratory technician need to make 2.00 L of a .200 mol/L solution by dilution of the original, concentrated solution?
1 answer
1 answer