How meany pups are in 6 litters of puppies?

What’s the scientific notation for the number 6,840,000,000

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

Using the periodic table, complete the table to describe each atom. type in your answers