1. How many grams of helium must be released to reduce the pressure to 69 atm...

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Chemistry

1. How many grams of helium mustbe released to reduce the pressure to 69 atm assuming ideal gasbehavior?
2. If the pressure exerted byozone, O3, in the stratosphere is 3.0Ã—10âˆ’3atm and the temperatureis 251 K , how many ozone molecules are in a liter?
3. Carbon dioxide makes upapproximately 0.04% of Earth's atmosphere. If you collect a 3.0 Lsample from the atmosphere at sea level (1.00 atm) on a warm day(29 âˆ˜C), how many CO2 molecules are in your sample?

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3.7 Ratings (344 Votes)

1.
We nned to mention the initial pressure
2.
use:
P*V=n*R*T
3*10^-3*1 = n*0.0821*251
n=1.456*10^-4 mol

number of molecules = number of moles * Avogadro's number
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 1.456*10^-4 mol * (6.022*10^23)
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 8.8*10^19 molecules
Answer: 8.8*10^19 molecules

3.
volume of CO2 = 0.04% of 3 L = 1.2*10^-3 L
use :
P*V=n*R*T
1*(1.2*10^-3)= n*0.0821*(273+29)
n = 4.84*10^-5 mol

number of molecules = number of moles * Avogadro's number
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 4.84*10^-5 * (6.022*10^23)
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 2.9*10^19 molecules
Answer: 2.9*10^19 molecules

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