HELPPP I needa tutor! Anyone who’s good at chemistry???

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

Why do cells appear different in distilled water than they do in 10% salt water?

In 2002, the rare earth elements mine in mountain pass, california was closed because