HELP PLEASE ASAP 1. A balloon is filled with helium gas. At sea level, where the
ID: 841288 • Letter: H
Question
HELP PLEASE ASAP
1. A balloon is filled with helium gas. At sea level, where the pressure is 1/02 atm and the temperature is 29 C, the balloon has a volum of 2.5 liters. What is the volume of the balloon if it rides in the atmosphere to where the pressure is 0.72 atm and the temperature is 12 C?
answer is 3.3 L but I need to know how!
2. A mixture of gases contains hydrogen and helium.If the total pressure is 1.45 atm and the partial pressure of the hydrogen is 1.24 atm, what is the partial pressure of helium?
answer is 160 mmHg tell me how
3. A mixture of gases containing hydrogen and helium is in a 100 liter container at 25 degrees C. If the partial pressure of hyrdrogen is 0.35 atm and the partial pressure of the helium is 0.46 atm, what is the total number of moles of gas present?
answer is 0.331 tell me how
Explanation / Answer
1. When no of moles of gas is same:
V2/V1=(P1/P2)*(T2/T1)
Here, P1=1.02 atm
P2=0.72 atm
T1=29? =302 K
T2=12 ? =285 K
V1=2.5 ltr
V2=(1.02/0.72)(285/302)*2.5
=3.3 ltr
2. Ptotal=Phydrogen+Phelium
1.45=1.24+Phelium
Phelium=0.21 atm
0.21 atm=0.21*760=160 mm Hg
3. Total pressure=0.35+0.46=0.81 at,
Tempratute, T=298 K
Volume=100 ltr
n= PV/RT=0.81*100/0.0821*298
=0.331 mol
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