Homework Answers
Answer
21.41g
Ideal gas equation is
PV = nRT
P = pressure, 1atm
V = volume , 15.0L
n = number of moles , ?
R = gas constant , 0.082057( L atm /mol K)
T = Temperature, 273.15K
n = PV/RT
= 1atm × 15.0L/ (0.082057(L atm/mol K) × 273.15K)
= 0.6692mol
mass of O2 occupy 15.0L at STP = 0.6692mol × 32g/mol = 21.41g
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