Hydrogen gas has a density of , and at normal pressure and one mole of it takes up. How would you calculate the moles in of hydrogen gas?.

Which is an advantage to using nonrenewable resources? a. they can be cheaper. b.they can have a lower impact on the environment. c.they can be used up rapidly. d.they can contribute to global warming.

Explain how earth is like a giant bar magnet. how is our magnetic field made?

Why has there been such a large increase in theft and other crimes in the u.s