Question

If the volume of a gas container at 32.0°c changes from 1.55 l to 755 ml, what will the final temperature be?

Answer 1

Charles law states that volume of gas is directly proportional to temperature at constant pressure.
$\frac{V1}{T1} = \frac{V2}{T2}$
where V - volume and T - temperature 
parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation 
T1 - 32 °C + 273 = 305 K
substituting these values in the equation 
$\frac{1550 mL}{305 K} = \frac{755 mL}{T}$
T = 149 K
temperature in celsius = 149 K - 273 = - 124 °C
new temperature is 124 °C