A hot air balloon contains 6.78 x 10^29 molecules of gas. How many moles does it contain?

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder