Zn + 2HCl → ZnCl2 + H2 How many moles of hydrogen are produced from the reaction of
6.0 moles of zinc?

6

Explanation:

6.0mol ( 1 mol H2/ 1 mol Zn ) = 6.0 mol of H2

H2 is hydrogen gas (hydrogen in the air).

h let me think

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.