`#AkaShi`
PTHH:
`Zn + H_2SO_4 -> ZnSO_4 + H_2`
`n_{Zn}=(16,25)/65=0,25 (mol)`
`⇒n_{H_2SO_4}=0,25 (mol)`
`⇒C%_{H_2SO_4}=(0,25xx98)/100xx100%=24,5 %`
`⇒n_{H_2}=0,25 (mol)`
`⇒V_{H_2}=0,25xx22,4=5,6 (l)`
b) `n_{ZnSO_4}=0,25 (mol)`
`⇒m_{ZnSO_4}=0,25xx161=40,25 (g)`
`⇒m_{dd sau pư}=100+16,25-0,25xx2=115,75 (g)`
`⇒C%_{ZnSO_4}=(40,25)/(115,75)xx100%≈34,77%`
