Đáp án:
$b,m_{ZnCl_2}=27,2g.$
$c,V_{H_2}=4,48l.$
$d,m_{H_2}(dư)=0,1g.$
Giải thích các bước giải:
$a,PTPƯ:Zn+2HCl\xrightarrow{} ZnCl_2+H_2↑$
$n_{Zn}=\dfrac{13}{65}=0,2mol.$
$Theo$ $pt:$ $n_{ZnCl_2}=n_{Zn}=0,2mol.$
$⇒m_{ZnCl_2}=0,2.136=27,2g.$
$c,Theo$ $pt:$ $n_{H_2}=n_{Zn}=0,2mol.$
$⇒V_{H_2}=0,2.22,4=4,48l.$
$d,PTPƯ:CuO+H_2\xrightarrow{t^o} Cu+H_2O$
$n_{CuO}=\dfrac{12}{80}=0,15mol.$
$\text{Lập tỉ lệ:}$ $\dfrac{0,15}{1}=\dfrac{0,2}{1}$
$⇒n_{H_2}$ $dư.$
$⇒n_{H_2}(dư)=0,2-\dfrac{0,15.1}{1}=0,05mol.$
$⇒m_{H_2}(dư)=0,05.2=0,1g.$