As a result of the isochoric process, the gas temperature increased by 30%, and the pressure became equal

As a result of the isochoric process, the gas temperature increased by 30%, and the pressure became equal to 200 kPa. What is the initial gas pressure?

To find the value of the initial pressure of the specified gas, we use the proportion (we take into account that the process is isochoric): Pн / Тн = Рк / Тк, from where we can express: Pн = Рк * Тн / Тк.
Variables: Рк – pressure reached by the indicated gas (Рк = 200 kPa); Tk (final temperature) = 1.3 Tn (initial temperature).
Calculation: Pn = Pk * Tn / Tk = 200 * Tn / 1.3Tn = 153.85 kPa.
Answer: The initial pressure of the indicated gas was 153.85 kPa.