Answer:
a) 10.0 g
Explanation:
The glucose is a nonvolatile compound, so when added to a solvent, it will change the boiling point of this substance, which is called ebullioscopy. The change in temperature can be calculated by:
ΔT = K*W*i
Where K is the constant, W is the molality, and i is the van't Hoff factor.
The van't Hoff factor is related to the dissociation of the compound. For molecular compounds, such as glucose, i = 1.
119.81 - 118.10 = 3.07*W
3.07W = 1.71
W = 0.5570 mol/kg
The molality can be calculated by:
W = m1/M1*m2
Where m1 is the mass of the solute in g, M1 is the molar mass of the solute, and m2 is the mass of the solvent in kg.
0.5570 = m1/180*0.1
m1 = 10.026 g ≅ 10.0 g
