Câu 8:
a,
$n_{KOH}=0,15.0,4=0,06(mol)$
$\to m_{KOH}=0,06.56=3,36g$
b,
$n_{MgSO_4}=0,2.0,8=0,16(mol)$
$\to m_{MgSO_4}=0,16.120=19,2g$
Câu 9:
a,
$V_{dd}=\dfrac{0,4}{0,8}=0,5l$
b,
$V_{dd}=\dfrac{0,06}{2}=0,03l$
c,
$n_{MgSO_4}=\dfrac{4,8}{120}=0,04(mol)$
$\to V_{dd}=\dfrac{0,04}{0,08}=0,5l$
Câu 10:
a,
$C_M=\dfrac{0,45}{0,3}=1,5M$
b,
$C_M=\dfrac{0,4}{0,5}=0,8M$
