chemistry
posted by tom .
Calculating Parts per million
Helium gas, 3.0 x 10^4 is dissolved in 200.0 g of water. Express this concentrartion in parts per million.

chemistry 
DrBob222
He = 3.0 x 10^4 what? grams?
[3.0 x 10^4 g/200.0 g water]*100 = %He. right?
Technically, the denominator is (200+0.0003) but we'll ignore the small number. So now you have percent, which is parts per hundred, just multiply by what factor to convert to parts per million.
??pph x (10^6/10^2) = ?? ppm.
I just remember that 1 ppm is 1 mg/L.
3.0 x 10^4 g = 0.3 mg. Put that in 200 mL = 0.3 mg/200 mL = 0.00150 mg/mL and multiply by 1000 to convert to L so that is 1.50 ppm. Is that the same number as the first method?
Respond to this Question
Similar Questions

chemistry
New York citys 7.9 million people have a daily per capita consumption of 173 gallons of water. how many tons of sodium flouride would be requred per year to give this watr 1 part flourine per million parts water? 
chem
The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm means 1 part of solute for every 106 (one million) parts of solution. Mathematically by mass: ppm = µg … 
sciance
what are the definitions of these words: Solute Infer Serial Dilute Parts per million parts per billion parts per trillion epidemiology epidemic contaminate microrgansims Quantitative Chlorine risk tradeoff thanks 
Chemistry
Can someone try this out so I can see if I'm correct? 
chemistry
If 0.60 mg of KCl is present in 3.0 L of aqueous solution, what is the concentration in terms of molarity, weight/volume percent, parts per thousand, and parts per million? 
science
helium gas, 3.0 x 104 g dissolved in water, express this concentration in parts per million. 
Chemistry
1. What is the percent by mass of a solution that contains 50 grams of solute dissolved in 200 grams of solution? 
Math(Probability)
Students took n = 35 samples of water from the east basin of Lake Macatawa and measured the amount of sodium in parts per million. For their data, they calculated notation bar x= 24.11 and s^2= 24.44. Find an approximate 90% confidence … 
chemistry
If 19.7 g of CaCl2 are present in 200 mL of aqueous solution, what is the concentration in terms of the following? 
math
The amount of pollution, A (in part per million), present in the air outside a factory on a recent weekday is represented by the equation A= t^2+16t+6, where t is the number of hours after 7 AM. (a) find the Times (in radical form) …