Help to solve a physics question?

Question

Hello! I need help to solve a physics question.

The question is this one:

An ideal gas evolves of a status A for a status B, according to the represented graph to follow.

http://www.icone.eng.br/Gases22.jpg

The temperature in the status A, is 80K. Like this, what's the temperature in the status B?

Answer 1

From the ideal gas equation:

The ratio P*V/T is a constant

so:

p1*v1/*T1=p2v2/*T2

substituting:

(1*2.4)/80 = 1.8*5/T2

solving

T2=(1.8*5)/(1*2.4/80)

= 300 K

=the temperature at B

Answer 2

ideal gas means PV=nRT

so

PaVa=nRTa

PbVb=nRTb

from both equations: nR=PaVa/Ta=PbVb/Tb

so solve for Tb=PbVbTa/PaVa

you have all the numbers so plug them in

Tb=300K