These substances are all h2o2 li nacl o2 elements pure substances molecules compounds

How many liters of hydrogen gas will be produced at stp from the reaction of 7.179×10^23 atoms of magnesium with 54.219g of phosphoric acid (h3po4) the equation is 3mg + 2h3(> mg(po4)2+3h2

Avariable that is not being directly tested during an experiment should be

‘which reaction would most likely require the use of an inert electrode?