Question

Which of the following solutions contains same molar concentration?

• A. $166$ g of $KI$ per litre solution
• B. $33.0$ g $(N{H}_4{)}_{2}S{O}_4$ in $200$ mL solution
  
• C. $25.0$ g $CuS{O}_4.5H_{2}O$ in $100$ mL solution
• D. $27.0$ mg $A{l}^{3+}$ per mL solution

Answer 1

Answer: (A), (C), (D)

The correct options are
A $166$ g of $KI$ per litre solution
C $25.0$ g $CuS{O}_4.5H_{2}O$ in $100$ mL solution
D $27.0$ mg $A{l}^{3+}$ per mL solution

Molecular weight of $KI,(N{H}_4{)}_{2}S{O}_4,CuS{O}_4.5H_{2}O$ and $A{l}^{3+}$ are $166,132,250$ and $27$ g/mol respectively.
a. For $KI$, Molarity $=\frac{166\times 100}{166\times 100}=1.0M$

b. For $(N{H}_4{)}_{2}S{O}_4$, Molarity $=\frac{33\times 1000}{132\times 200}=1.25M$

c. For $CuS{O}_4.5H_{2}O$, Molarity $=\frac{25\times 1000}{250\times 100}=1.0M$

d. For $A{l}^{3+}$, Molarity $=\frac{27\times {10}^{-3}\times 1000}{27\times 1}=1.0M$

Hence, options A, C and D are correct.