# A small bubble rises from the bottom a lake, where the temperature and pressure are 4 deg C and 3.0 atm, to the waters surface, where the 25°C and 95 atm. How do you calculate the final volume of the bubble if its initial volume was 2.1 mL?

I think you might want to review this question's terms. I get approx. $7 \cdot m L$ IF the end pressure is $0.95 \cdot a t m .$
We use the $\text{combined gas law:}$ $\frac{{P}_{1} {V}_{1}}{T} _ 1 = \frac{{P}_{2} {V}_{2}}{T} _ 2.$
And thus ${V}_{2} = \frac{{P}_{1} \times {V}_{1} \times {T}_{2}}{{T}_{1} \times {P}_{2}}$
=(3.0*atmxx2.1*mLxx298*K)/(277*Kxx0.95*atm)=??mL