Question

Which of the following compounds will form an electrolyte in solution?
A. MgCl₂
B. C₆H₁₂O₆
C. C₂H₅OH
D. C₅H₁₂

What is the molarity of a 785 ml solution that contains 6.5 moles of HCl?
A. 8.3 M
B. 0.008 M
C. 121 M
D. 0.12 M

Answer 1

the ansewer your looking for is d

Answer 2

Answer:

1) The correct answer is option A.

2) The correct answer is option A.

Explanation:

1) Electrolytes are the substance which break down into ions when dissolved in water and thus from current conducting liquid solutions .

These compounds in solid form does not conduct electricity due to the absence of free ions.

Magnesium chloride dissociate into its constituent ions when dissolved in water.

$MgCl_2(aq)\rightarrow Mg^{2+}(aq)+2Cl^-(aq)$

Magnesium chloride is the correct answer.

2) Molarity of a 785 ml solution that contains 6.5 moles of HCl.

Volume of solution = 785 mL = 0.785 L

Moles of HCl = 6.5 mol

$Molarity=\frac{\text{Moles of compound}}{\text{Volume of solution(L)}}$

$M=\frac{6.5 mol}{0.785 L}=8.2802 mol/L\approx 8.3 mol /L$

Hence, the correct answer is option A.