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R = 0.0821 (l x atm / mol K)
T = -25 + 273 = 248 K
V = 4 L
n = 0.4 moles
P x V = n x R x T
P = n x R x T
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V
P = 0.4 moles x 0.0821 (L x atm / mol x K) x 248 K
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4 Litros
P = 2.036 atm
1 atm ----- 760 mmHg
2.036 atm ----- x
x = 1547,36 mmHg