Answer;
68.46 g of sucrose in 100mL
Solution and explanation;
Given 2L of 2 mol/L sucrose solution
Moles = concentration x volume
Therefore; The number of moles in this solution is 2 L x 2 mol/L = 4 mol
The molecular mass of sucrose is 342.3 g/mol.
Mass = Moles × Molecular weight
Therefore the mass of sucrose in 2 L;
= 4 mol x 342.3 g/mol = 1369.2g
but; 2L/20 = 100 mL
= 1369.2/20 = 68.46
Hence; you would have 68.46 g in 100 mL
Answer:
B. Colloid
Explanation:
Colloid is a mixture that is made up of very small homogeneous particles, thus can not be separated into fractions. Its particles do not settle as other solution, but are evenly dispersed in the medium. Some examples are: liquid milk, jelly, rubber etc
Since colloid is a solution, thus it is made up of two parts; its particles and dispersing medium.
The cathode electrode is copper. This means that the concentration of copper must be increased to increase the cell potential. This can be done by diluting the Al3+ solution. Increasing the surface area will not change the current but will increase the voltage. The answer is (D) I and III only.
