<u>Answer:</u> The volume when the pressure and temperature has changed is 90.21 mL
<u>Explanation:</u>
<u>At STP:</u>
The temperature at this condition is taken as 273 K
The pressure at this condition is taken as 1 atm or 101.3 kPa.
To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law.
The equation follows:

where,
 are the initial pressure, volume and temperature of the gas
 are the initial pressure, volume and temperature of the gas
 are the final pressure, volume and temperature of the gas
 are the final pressure, volume and temperature of the gas
We are given:
![P_1=101.3kPa\\V_1=?mL\\T_1=273K\\P_2=109kPa\\V_2=80.0mL\\T_2=-12.5^oC=[-12.5+273]K=260.5K](https://tex.z-dn.net/?f=P_1%3D101.3kPa%5C%5CV_1%3D%3FmL%5C%5CT_1%3D273K%5C%5CP_2%3D109kPa%5C%5CV_2%3D80.0mL%5C%5CT_2%3D-12.5%5EoC%3D%5B-12.5%2B273%5DK%3D260.5K)
Putting values in above equation, we get:

Hence, the volume when the pressure and temperature has changed is 90.21 mL