<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 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