At a certain fixed temperature, the reaction below: A(g) 2B(g) AB2(g) is found to be first order in the concentration of A and zeroth order in the concentration of B. The reaction rate constant is 0.05s-1. If 2.00 moles of A and 4.00 moles of B are placed in a 1.00 liter container, how many seconds will elapse before the concentration of A has fallen to 0.30 moles/liter

34.7s elapse before the concentration of A has fallen to 0.30 M

Explanation:

A reaction that is first order follows the equation:

ln [A] = ln [A]₀ - kt

Where [A] is concentration of A (0.30M) in time t, and [A]₀ is initial concentration (2.00M). K is reaction rate constant (0.05s⁻¹).

Replacing:

ln [0.30] = ln [2.00] - 0.05s⁻¹t

t = 34.7s elapse before the concentration of A has fallen to 0.30 M

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.