A) 10 M
B) 12 M
C) 13 M
D) 14 M
Correct Answer: B
Solution :
Key Idea: Calculate the molarity of solution by using formula, \[Molarity=\frac{moles\text{ }of\text{ }solute}{volume\text{ }of\,solution\text{ }m\text{ }litre}\] Given: Mass of solute (by mass) = 37%, \[d=1.18g/mL\] Molecular mass of \[HCl=1+35.5=36.5\text{ }g/mol\] \[Volume\text{ }of\text{ }solute=\frac{mass\text{ }of\text{ }solute}{density\text{ }of\text{ }solution}\] \[=85\text{ }c{{m}^{3}}=0.85\text{ }d{{m}^{3}}\] Moles of solute\[(HCl)\] \[=\frac{mass\text{ }of\text{ }solute}{molecular\text{ }mass\text{ }of\text{ }solute}\] \[=\frac{37}{36.5\text{ }g/mol}\] \[=1.01\text{ }mol\] \[\therefore \] \[molarity\text{ }of\text{ }solution=\frac{1.01\,mol}{0.085\,d{{m}^{3}}}\] \[=12.0\text{ }mol\text{ }d{{m}^{3}}\] \[=12.0M\]
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