How many Liters of fluorine are required to produce 290,8 g of
Eobalt(II) fluoride?

The formula is CoF2

Mass of one mole = 58.933 + 2 * 18.998 = 59.03827424 gram

Number of moles = 290 ÷ 59.03827424

This is approximately 4.912 moles.

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