Use the combined gas law:

(P_{1} * V_{1}) / T_{1} = (P_{2} * V_{2}) / T_{2} but since volume does not change and remains constant, this can be simplified to

P_{1 }/ T_{1} = P_{2} / T_{2}

Therefore P_{1 }/ 234 = 110 / 300

Therefore P_{1} = (110 * 234)/300 = **85.8 kPa**

Since there are 101.325 kPa in 1 atm, then the initial pressure is

85.8/101.325 = **0.847 atm**