6.What mass of iron is needed to react with 19.0 grams of sulfur?
8 Fe +Ss → 8 FeS

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

Explain how global warming could have affected yellowstone frog and salamander habitat's, resulting in changes in the populations of these species

Acertain atom has 22 protons and 19 electrons. this atom loses an electron. the net charge on the atom is now 4+1+01-4-. if this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be 3+2+02-3-.