Question

4. Glucose is a simple sugar and a molecular compound. A concentrated sample of an aqueous glucose (C6H12O6, M= 180.16 g/mol) solution has a density of 1.23 g/mLand contains 58.0 % glucose by mass.

1. Write an equation for the dissolution of glucose in water.

b)       Does this solution conduct an electric current? Explain.

[No]

c)       What is the molarity of this glucose solution?

[3.96 M]

4. Calculate the number of glucose molecules contained in 1 mL of this solution.

Answer 1

lets tackle this questions one by one

A. equation for dissolution of glucose in water

C₆H₁₂O₆ (s) + H₂O (l) -------> C₆H₁₂O₆ (aq)

since glucose is not ionic in nature and is infact covalent while dissolution it does not dissociates into the ions.

B. aqueous solution of glucose does not conduct electricity

any aqueous solution conducts electricity because it has ions in it but glucose when dissolved in water does not dissociates into the ions since the bonds in glucose are covalent in nature

so glucose does not conduct electricity

C. molarity of e glucose solution

since we know the molarity is

molarity =

since it contains 58% glucose by mass

lets consider this as 100 gm solution

so the mass of glucose is 58gm (0.058kg)

mass of water = (100-58)

=42 gm (0.042kg)

to calculate molarity we need to know the moles of solute i.e. moles of glucose

moles of glucose = mass of glucose / molar mass of glucose

= 58gm/ 180.16 gm/mol

=0.3216 moles of glucose

to calculate volume of solution in literes

volume = mass/density

= 100g/1.23 moles

=81.30 ml

=0.0813 L

so since the molarity is=

=0.3216/0.0813

=3.96 molar

hence molarity of this solution is 3.96 .

D.

calculate no of glucose molecule in 1 ml of this solution

since 1 L of this solution contains 3.96 moles

so 1 ml will contain 3.96/1000

0.00396 moles

(since 1 L =1000 ml )

0.00396* 6.022*10²⁷ (avogadros no)

2 10²¹ molecules are present

i hope this helps if you have any query or want more detailed explaination feel free to ask in the comment section below.

noofmoleso f solute volumeofsolutioninliters

noofmoleso f solute volumeofsolutioninliters

We were unable to transcribe this image

noofmoleso f solute volumeofsolutioninliters

noofmoleso f solute volumeofsolutioninliters

We were unable to transcribe this image