we have to solve this question using gas laws.
I have used the Charles law, which is one of the gas laws and relates volume to the temperature of the gas.
Initial Volume:(Vi)=400 cm³
Initial Temperature:(Ti)=7°C = 273 +7 = 280K
Final Temperature:(Tf)=27°C = 300K
we have to find the
Final Volume: (Vf)=?
We need the volume of air expanded so