Question

What volume will 10 L of gas at 450 torr occupy if the pressure is increased to 910 torr at constant temperature

Answer 1

$V_1 = 10\textsf{ L}\\ P_1= 450\textsf{ torr}\\ V_2=\ ?\\ P_2 = 910\textsf{ torr}$

According to Boyle's law;

$P_1V_1 = P_2V_2\\ 450×10 = 910× V_2\\ V_2 = 4.95\textsf{ L}$