Gay Lussac's Law :
When the volume is constant, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2} [/tex]
Input the value:
[tex]\tt \dfrac{700\:mmHg}{283\:K}=\dfrac{900\:mmHg}{T_2}\\\\T_2=\dfrac{900\times 283}{700}=363.86\:K=90.86^oC [/tex]
