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How many moles of helium gas are contained in a 4.0-L flask at STP?
Wiki User
∙ 13y ago
Because you're in STP conditions, you can use molar volume in a proportion. Molar volume is the volume one mole of an ideal gas will take up at STP: 22.4 liters/mole. To set up a proportion, think: if one mole of a gas occupies 22.4 liters, then 4.0 moles of a gas will occupy x liters.
1 mole/22.4 L = 4.0 mole/X L
x = 44.8 liters
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoIdeal gas law.
Pressure*Volume = moles*R constant*temperature in Kelvin
PV = nRT
(1 atm)(2.00 L) =n(0.08206 L*atm/mol*K)(298.15 K)
2.00/24.466 = moles N2
= 0.0817 moles nitrogen gas
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Wiki User
∙ 13y ago1 MOLE of gas occupies 22.4 Liters at STP so a 4 liter flask conatins 4/22.4 = 0.1786 moles
Wiki User
∙ 11y ago1 mole occupies 22.4 liters. So 2/22.4 = 0.0893 moles
Wiki User
∙ 11y ago4.00mol CO2 x 22.4L CO2/1mol CO2 = 89.6L CO2
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