How does one mole of hydrogen gas equal 22400mL?? (please help i’m sooo confused)

List four observations that indicate that a chemical reaction may be taking place

What must occur for air masses to form fronts

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules