If the pressure is 0.9 kPa. and the volume is 4.0L, then the pressure changes to 0.20 kPa. What is the new volume?

18 L

Explanation:

boyles law

P1V1 = P2V2

V2 = P1V1/P2

V2 = (.9 * 4)/.2

V2 = 18

Explanation:

MnO₄⁻ + 5 Fe2⁺ + 8H⁺ = Mn⁺² + 5Fe⁺³ + 4H₂O.

- d [MnO₄⁻ ] / dt = 4 x 10² mol /L.s.

- [ Fe²⁺ ] / dt = 5 x - d [MnO₄⁻ ] / dt

= 5 x 4 x 10² mol /L.s.

20 x 10²

- d [ H⁺] / dt = 8 x - d [MnO₄⁻ ] / dt

= 8 x  4 x 10²

= 32 x 10² mol /L.s.

+d [ Mn⁺² ] / dt = - d [MnO₄⁻ ] / dt

= 4 x 10² mol /L.s

+d [ Fe⁺³ ] / dt = 5 x - d [MnO₄⁻ ] / dt

= 20 x 10² mol /L.s