(289 + 273) K x (2.64 L / 9.56 L) = 155.2 K = −118 °C
But that's not realistic since SF6 will solidify before such a low temperature is reached. The point being that you can't get that amount of SF6 to occupy 2.64 L as a gas without increasing the pressure significantly -- then the temperature depends on how much pressure was used.
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(289 + 273) K x (2.64 L / 9.56 L) = 155.2 K = −118 °C
But that's not realistic since SF6 will solidify before such a low temperature is reached. The point being that you can't get that amount of SF6 to occupy 2.64 L as a gas without increasing the pressure significantly -- then the temperature depends on how much pressure was used.