How many moles of Fe2+ are there in a 2.0g sample that is 80% by mass of FeCl2?

The number of moles of in the sample of is moles.

The following points should be noted about the number of moles:

Mass of the sample given as and the molar mass of the sample as .

Therefore, the number of moles of  is obtained by dividing the mass by the molar mass.

Hence the number of moles is obtained as moles.

Learn more about the number of moles here:

A walkthrough for a sample titration calculation for all levels of chemistry. ... Now that gives us the moles of Fe2+, but it's asking for how many grams there are. ... The molar mass of iron is about 55.8, so we'll just put that.

Missing: 80%

Explanation:

the answer would be a

gas

explanation:

smoke is the matter of a gas