What is the mole fraction of I2 in a solution made by dissolving 55.6 g of I2 in 245 g of hexane, C6H14?

The answer to your question is X = 0.072

Explanation:

Data

X I₂ = ?

mass of I₂ = 55.6 g

mass of hexane = 245 g

Formula

X I₂ = (moles of Iodine) / (moles of iodine + moles of hexane)

Process

1.- Convert the mass of reactants to moles

atomic mass of I₂ = 2 x 127 = 254g

atomic mass of hexane = (12 x 6) + (14 x 1) = 86 g

                      254 g 1 mol

                         55.6 g  x

                         x = (55.6 x 1)/254

                         x = 0.22  moles of I₂

                          86 g   1 mol

                         245 g   x

                          x = (245 x 1)/86

                          x = 2.84 moles

2.- Calculate the mole fraction of I₂

X = 0.22 / (0.22 + 2.84)

X = 0.22 / 3.07

X = 0.072

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.