2)
a.
Zn + 2HCl --> ZnCl2 + H2
b.
6,5g md g n moli
Zn + 2HCl --> ZnCl2 + H2
65 2x36,5 1
=> md = 6,5x2x36,5/65 = 7,3 g HCl
c% = mdx100/ms
=> ms = mdx100/c% = 7,3x100/20 = 36,5 g sol. HCl
c.
=> n = 6,5x1/65 = 0,1 moli H2
1 mol H2 ............................. 6,022x10la23 molecule H2
0,1 moli H2 .......................... a = 6,022x10la22 molecule H2