`#AkaShi`
Gửi bạn 😼
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PTHH:
`Mg + 2HCl -> MgCl_2 + H_2↑ (1)`
`MgO + 2HCl -> MgCl_2 + H_2O (2)`
`→n_{H_2}=(V_{H_2})/(22,4)=(3,36)/(22,4)=0,15 (mol)`
`→n_{Mg}=n_{H_2}=0,15 (mol)`
`→m_{Mg}=n_{Mg}xxM_{Mg}=0,15xx24=3,6 (g)`
`→m_{MgO}=m_{hh}-m_{Mg}=10-3,6=6,4 (g)`
`b)`
`n_{Mg}=0,15 (mol)`
`→n_{MgO}=(m_{MgO})/(M_{MgO})=(6,4)/40=0,16 (mol)`
`→n_{HCl(1)}=2xxn_{Mg}=0,15xx2=0,3 (mol)`
`→n_{HCl(2)}=2xxn_{MgO}=0,16xx2=0,32 (mol)`
`→n_{HCl}=0,3+0,32=0,62 (mol)`
`→m_{HCl\ pư}=n_{HCl}xxM_{HCl}=0,62xx36,5=22,63 (g)`
`→m_{dd\ HCl}=22,63:36%=62,86 (g)`
`→V_{HCl}=m/D=(62,86)/(1,18)=53,2721 (ml)`