How do i delete a queastion

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

Define a is a tiny pavket of energy

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate