How many moles of gold are in 31.3 g of gold?

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

In water, a strong acid will break down into its component parts. a. completely b. partly c. never in water, a weak base will break down into its component parts. a. completely b. partly c. never

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as