Answer:
It forms a solution.
Explanation:
A pure substance is when only one type of atom or molecule is present. In this case the substance contains two different molecules; sugar and water, assuming sugar is all one type (e.g. glucose) and there are no contaminants in the water or sugar before combining the two.
Dissolving the sugar in the water makes a homogeneous mixture and once dissolved a solution is made by the combination of a solute (sugar) and solvent (water).
Hope this helps!!!!
Answer: 438 K
Explanation:
According to Gibbs equation:
![\Delta G=\Delta H-T\Delta S](https://tex.z-dn.net/?f=%5CDelta%20G%3D%5CDelta%20H-T%5CDelta%20S)
= Gibb's free energy change
= enthalpy change = 20.1 kJ/mol = 20100 J/mol
T = temperature
= entropy change = 45.9 J/Kmol
A reaction is at equilibrium when
= Gibb's free energy change is zero and becomes spontaneous when
= Gibb's free energy change is negative.
![\Delta H=T\Delta S](https://tex.z-dn.net/?f=%5CDelta%20H%3DT%5CDelta%20S)
![20100=T\times 45.9J/Kmol](https://tex.z-dn.net/?f=20100%3DT%5Ctimes%2045.9J%2FKmol)
T=437.9K
Thus the temperature at which the reaction change from nonspontaneous to spontaneous in the forward direction is 438 K