Gas with a volume of 10.0 L is trapped in an
expandable cylinder. If the pressure is tripled and the
temperature is increased by 80.0 percent (as measure
on the Kelvin scale), what will be the new volume of
the gas?



Answer :

To solve this question, we'll use the combined gas law, which relates the pressure, volume, and temperature of a gas. The combined gas law is expressed as: \[ \frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2} \] Where \( P_1 \) and \( P_2 \) are the initial and final pressures, \( V_1 \) and \( V_2 \) are the initial and final volumes, and \( T_1 \) and \( T_2 \) are the initial and final temperatures (measured in Kelvin), respectively. Let's identify what we have: - \( V_1 = 10.0 \text{ L} \) (initial volume) - \( P_1 \) (initial pressure, we just need to know it is increased by 3 times, the actual value doesn't matter since it will cancel out) - \( T_1 \) (initial temperature, similarly as pressure, we only need the relative increase) - \( P_2 = 3 \times P_1 \) (final pressure is triple the initial pressure) - \( T_2 = 1.8 \times T_1 \) (final temperature is increased by 80% which means it is 180% of the initial temperature) Now we want to find \( V_2 \), the final volume. We can rearrange the combined gas law to solve for \( V_2 \): \[ V_2 = \frac{P_1 V_1}{T_1} \times \frac{T_2}{P_2} \] Since we know that \( P_2 = 3 \times P_1 \) and \( T_2 = 1.8 \times T_1 \), we can plug them into the equation: \[ V_2 = \frac{P_1 \times 10.0}{T_1} \times \frac{1.8 \times T_1}{3 \times P_1} \] Simplifying the equation, we notice that \( P_1 \) and \( T_1 \) cancel out: \[ V_2 = 10.0 \times \frac{1.8}{3} \] Calculate the final volume \( V_2 \): \[ V_2 = 10.0 \times 0.6 \] \[ V_2 = 6.0 \text{ L} \] Therefore, the new volume of the gas when the pressure is tripled and the temperature is increased by 80% will be 6.0 L.