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An ideal gas at 0 °C is contained within a rigid vessel. The temperature of the...

An ideal gas at 0 °C is contained within a rigid vessel. The temperature of the gas is increased by 1 C°. What is Pf/Pi, the ratio of the final to initial pressure?

A) 273/274

B) 274/273

C) 1/2

D) 1/10

E) 1/273

Solution is B (274/273), but i don't get why?

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