Use the ideal gas equation, and the volume above, to calculate the number of moles of H2 gas produced during each unknown run. Assume again that the gas temperature at the end of each run is 22 degrees C. Hint from teacher: Use the formula PV=nRT to solve for n (number of moles). You know the volume, or "V" (calculated in discussion #22), you know the value of R (0.0821 L x atm/mol x K). Make sure you convert the temperature to Kelvin and the pressure to atm before plugging into this formula.
Volume is 24.216 Litres from #22

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.