Question

properties of gases and gas laws
andros hooper
example 1 (#15)

• a sample of co₂ gas is placed in a 125ml

flask where it exerts a pressure of 67.5
mmhg. what is the pressure of this gas
sample when it is transferred to a 500ml
flask at the same temperature?
multiple - choice question
which variables are changing or will change in this problem?
check all that apply.
volume
moles
temperature
pressure

Explanation:

Step1: Analyze the problem

We have a gas sample. The initial volume \(V_1 = 125\space mL\) and initial pressure \(P_1=67.5\space mmHg\). The final volume \(V_2 = 500\space mL\). Temperature is constant (given "at the same temperature") and moles of gas remain the same (no gas is added or removed).

Step2: Apply Boyle's Law

Boyle's Law is \(P_1V_1=P_2V_2\). We are interested in which variables change. Volume changes from \(125\space mL\) to \(500\space mL\). Using \(P_2=\frac{P_1V_1}{V_2}\), pressure will also change.

Answer:

Pressure, Volume