Nacl=na+cl2 NaOH + HCI = HOH + NaCI
H2 + O2 = H20
K + AgCl2 = Ag + KCI
C5H9O + O2 = CO2 + H2O
HCI + NaOH = H2O + NaCl

Please somebody tell me their correct reaction types

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3