I need help as soon as possible please!!

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

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true