How many atoms of oxygen are in a molecule of nitroglycerin

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88

May someone me with these science questions

I’m an electrically neutral atomic any element, there are equal numbers of