Answer:
Molarity of a solution may be
calculated as,
\[M=\frac{{{w}_{B}}\times
1000}{{{m}_{B}}\times V}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,......(i)\]
Given \[M=0.375,V=500mL,{{m}_{B}}=82\]
Putting
these values in Eqn. (i), we get
\[0.375=\frac{{{w}_{B}}\times 1000}{82\times 500}\]
\[{{w}_{B}}=\frac{0.375\times
82\times 500}{1000}=15.375g\]
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