Given:
P = 1.8 atm
V = 28.0 L
T = 298.0 K
find number of moles using:
P * V = n*R*T
1.8 atm * 28 L = n * 0.08206 atm.L/mol.K * 298 K
n = 2.061 mol
Answer: 2.06 mol
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