What is the mass percentage of iodine (i2) in a solution containing 4.0×10−2 mol i2 in 140 g of ccl4?

The mass percent of iodine in the solution is 6.77 %

Explanation:

To calculate the number of moles, we use the equation:

We are given:

Moles of iodine gas =

Molar mass of iodine gas = 254 g/mol

Putting values in above equation, we get:

To calculate the percentage composition of a substance in a solution, we use the equation:

We are given:

Mass of solute (iodine gas) = 10.16 g

Mass of solvent (carbon tetrachloride) = 140 g

Mass of solution = (140 + 10.16) g = 150.16 g

Putting values in above equation, we get:

Hence, the mass percent of iodine in the solution is 6.77 %

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

it's filtration, but this is an assumption so my apologies if i got this