Gauss's law states that the total electric flux passing through any closed surface is equal to the enclosed electric charge divided by the permittivity of free space. The document provides an example of calculating the electric flux produced by multiple point charges enclosed within a closed surface. It states that the electric flux is calculated by taking the total enclosed charge Q and dividing it by the permittivity of free space ε0. In other words, the electric flux Φe equals the total enclosed charge Q divided by the permittivity of free space ε0.