Why is endosymbiosis important to living things?

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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

Word equation for k(s) +h2o(l) yield koh (aq) + h2