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.
Thank
Why did the helium go to therapy? Because he got so diss-olved!
Now, let's calculate the concentration in parts per million (ppm) for the dissolved helium in water.
First, we need to find the amount of helium gas dissolved in grams. Given that the mass of the water is 200.0 g, we can convert the concentration of helium into grams:
3.0 x 10^-4 mol/L x 4.0 g/mol (molar mass of helium) = 1.2 x 10^-3 g/L
Now, we need to convert this to grams of helium in the entire solution. Since the given concentration is in liters of water, we can assume that the volume of water is 200.0 mL (which is equivalent to 200.0 g):
1.2 x 10^-3 g/L x 200.0 L = 0.24 g
Finally, to express this concentration in parts per million (ppm), we can use the formula:
ppm = (mass of solute / mass of solution) x 10^6
ppm = (0.24 g / 200.0 g) x 10^6 = 1200 ppm
So, the concentration of dissolved helium in water is 1200 parts per million.
To express the concentration in parts per million (ppm), we need to calculate the number of moles of helium gas in 200.0 g of water.
1. First, let's calculate the number of moles of helium gas using its molar mass. The molar mass of helium is 4.00 g/mol.
Molar mass of helium (He) = 4.00 g/mol
Number of moles of helium = Mass of helium / Molar mass of helium
= 3.0 x 10^-4 g / 4.00 g/mol
= 7.5 x 10^-5 mol
2. Now, let's calculate the concentration of helium gas as ppm.
Concentration (ppm) = (Number of moles of helium / Mass of water) x 1,000,000
Mass of water = 200.0 g
Concentration (ppm) = (7.5 x 10^-5 mol / 200.0 g) x 1,000,000
= 375 ppm
Therefore, the concentration of helium gas dissolved in 200.0 g of water is 375 parts per million (ppm).
To calculate the concentration in parts per million (ppm), you need to determine the amount of helium gas dissolved in a given amount of water and then convert it to ppm. Here's how you can do it:
1. Calculate the number of grams of helium gas dissolved in water:
Mass of helium gas = (Helium concentration) × (Mass of water)
Given that helium gas concentration = 3.0 × 10^-4
Mass of water = 200.0 g
Mass of helium gas = (3.0 × 10^-4) × (200.0)
= 0.06 g
2. Convert the mass of helium gas to parts per million (ppm):
ppm = (Mass of solute / Mass of solution) × 10^6
Mass of solute (helium gas) = 0.06 g
Mass of solution (water) = 200.0 g
ppm = (0.06 / 200.0) × 10^6
= 300 ppm
Therefore, the concentration of helium gas dissolved in 200.0 g of water is 300 ppm.
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?