Here, P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. The given values are P = 0.957 atm, V = 1.4 L, R = 0.082057 L.atm/mol.K, and T = 315 K. We are looking for n, the number of moles. We can rearrange
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