$AgNO_3+NaBr\to AgBr\downarrow+NaNO_3$
$n_{AgBr}=\dfrac{28,2}{188}=0,15(mol)$
$\to n_{AgNO_3}=n_{AgBr}=0,15(mol)$
$\to V_{dd AgNO_3}=\dfrac{0,15}{2}=0,075=75ml$
$\to V=75(ml)$
Đáp án:$V=75ml$
PTHH: $AgNO_3 + NaBr \to AgBr + NaNO_3$
Ta có: $n_{AgBr}=\frac{28,2}{188}=0,15 (mol)$
$\to n_{AgNO_3}=n_{AgBr}=0,15 (mol)$
$\to V_{dd AgNO_3}=\frac{0,15}{2}=0,075=75ml$
$\to V=75ml$
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