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n (moles )= masa /Mm
R = 0.0821(atm L/ mol. K)
n = P x V
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R x T
n = 2 atm. x 1 L
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(0.0821 atm L/ molK)300 K
n = 0.0812 mol
Mm = masa / moles
Mm = 2.6 g
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0.0812 mol
Mm = 32.02 g/mol