A sample of gas has a volume of 200 ml at the pressure of 700 mm Hg. What will be it's pressure if its volume is reduced to 100 ml?

1400 mmHg

Explanation:

Assuming the gas can be modeled as an ideal gas:

PV = nRT

If temperature is held constant, then:

P₁ V₁ = P₂ V₂

Substituting values and solving:

(700 mmHg) (200 mL) = P (100 mL)

P = 1400 mmHg