Question

009 10.0 points

Sucrose is very soluble in water. At 25°C.
211.4 grams of sucrose will dissolve in 100
g of water. Given that the density of the
saturated sucrose solution is 1.34 g/mL. what
is the molarity of the solution? The molar
mass of sucrose is 342 g/mol.
1. 1.98 M
2. 2.66 M
3. 8.28 M
4.0.111 M
5. 0.00461 M

Answer 1

3= 8.28 M

Step-by-step explanation:

Given data:

Mass of sucrose = 211.4 g

Density of solution = 1.34 g/mL

Molar mass of sucrose = 342 g/mol

Molarity = ?

Solution:

First of all we will calculate the moles of solute.

Number of moles of sucrose = mass/molar mass

Number of moles of sucrose = 211.4 g / 342 g/mol

Number of moles of sucrose = 0.62 mol

Volume:

Volume = mass/ desity

Volume = 100 g/ 1.34 g/mL

Volume = 74.63 mL

Volume = 0.075 L

Molarity:

Molarity = moles of solute / volume in litter

Molarity = 0.62 mol / 0.075 L

Molarity = 8.27 M